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Numrering	Referens	Omslagsbild	Hitta
1.	Andersson, Stefan, 1975-, et al. (författare) Direct experimental verification of shot noise in short channel MOS transistors 2005 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 41:15, s. 869-871 Tidskriftsartikel (refereegranskat)abstract Drain noise current was measured at an extended temperature range on n-MOS transistors of various lengths made in a 0.18 urn process. A comparison with theoretical noise models strongly indicates the mechanism of shot noise produced near the source by diffusion currents, as proposed by Obrecht et al. © IEE 2005.
2.	Aulin, Tor, 1948, et al. (författare) Crossover product accumulate codes 2008 Ingår i: Electronics Letters. - 1350-911X .- 0013-5194. ; 44:20, s. 1211-1212 Tidskriftsartikel (refereegranskat)abstract A class of turbo-like codes with a crossover component, termed crossover product accumulate (CPA) codes is proposed. This structure is a serial concatenation of a crossover parallel concatenated code and an accumulator through an interleaver. A detailed iterative decodingscheme for CPA codes is described. Simulations show that different crossover depth makes CPA codes have different convergence in bit error rate (BER) performance, and a proper crossover structure produces faster convergence.
3.	Blad, Anton, 1981-, et al. (författare) Energy-Efficient Data Representation in LDPC Decoders 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:18, s. 1051-1052 Tidskriftsartikel (refereegranskat)abstract Data representations for LDPC decoders using the sum-product algorithm in the log-likelihood domain are considered. It is suggested that the look-up table implementation of the domain transform function is separated into two parts, allowing a compact representation of the internal state data. Memories and bus widths can be reduced by typically 16\%, while the imposed hardware overhead is insignificant.
4.	Bolin, Thomas, et al. (författare) Two-antenna receive diversity performance in indoor environment 2005 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 41:22, s. 1205-1206 Tidskriftsartikel (refereegranskat)abstract Receive diversity gain performance of a two-antenna setup in an office environment is reported. The terminal is handheld in front of the user simulating a data mode scenario while walking around. The dual polarised base station sector antenna is placed at the end of a corridor. The results indicate that experimentally achieved diversity performance is similar to previously predicted theoretical data.
5.	Bryllert, Tomas, et al. (författare) 11% efficiency 100 GHz InP-based heterostructure barrier varactor quintupler 2005 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 41:3, s. 131-132 Tidskriftsartikel (refereegranskat)abstract A record conversion efficiency of 11.4% at 100 GHz using a heterostructure barrier varactor (HBV) quintupler is demonstrated. The quintupler is based on a microstrip circuit mounted in a full-height crossed-waveguide block. The nonlinear element consists of a planar HBV diode fabricated in InGaAs=InAlAs=AlAs epitaxial layers on an InP substrate.
6.	Chen, D., et al. (författare) Dual-wavelength single-longitudinal-mode erbium-doped fibre laser based on fibre Bragg grating pair and its application in microwave signal generation 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:7, s. 459-460 Tidskriftsartikel (refereegranskat)abstract A simple dual-wavelength single-longitudinal-mode erbium-doped fibre laser is proposed by incorporating a fibre Bragg grating pair, which is used as a Fabry-Perot filter with two ultra-narrow (similar to 0.12 pm) transmission bands. Stable dual-wavelength single-longitudinal-mode lasing with a wavelength spacing of similar to 0.08 nm is achieved at room temperature. By beating the dual-wavelengths at a photodetector, a microwave signal at 9.616 GHz is demonstrated with a frequency stability better than 1 MHz and a spectral width less that 10 kHz.
7.	Chen, Daru, et al. (författare) Switchable dual-wavelength Raman erbium-doped fibre laser 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:4, s. 202-204 Tidskriftsartikel (refereegranskat)abstract A fibre Bragg grating feedback fibre laser with both Raman and erbium-doped fibre pumps is proposed. Dual-wavelength switching is achieved by controlling the power of the Raman pump. The characteristics of the dual-wavelength switching are studied experimentally, and the mechanism is explained physically.
8.	Chen, Daru, et al. (författare) Wavelength-spacing continuously tunable multiwavelength erbium-doped fibre laser based on DSF and MZI 2007 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 43:9, s. 524-525 Tidskriftsartikel (refereegranskat)abstract A novel multiwavelength erbium-doped fibre laser is proposed by incorporating a section of dispersion-shifted fibre (DSF) and a Mach-Zehnder interferometer (MZI). The wavelength spacing of the fibre laser can be continuously tuned by adjusting an optical variable delay line in the MZI-based comb filter. Stable multiwavelength lasing at room temperature with the standard ITU (International Telecommunication Union) channel spacing of 0.2 nm (25 GHz), 0.4 nm (50 GHz), 0.8 nm (100 GHz) or 1.6 nm (200 GHz) is demonstrated.
9.	Dai, D., et al. (författare) Design and Fabrication of an Ultrasmall Overlapped AWG Demultiplexers Based on α-Si Nanowire Waveguides 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:7, s. 400-402 Tidskriftsartikel (refereegranskat)abstract A novel layout for an ultra-compact arrayed-waveguide grating (AWG) demultiplexer is presented. The present layout has two overlapped free propagation regions, and is more compact than a conventional layout. Using αSi-on-SiO2 nanowire waveguides, an ultra-small 4×4 AWG (about 40×50 μm2) with channel spacing of 11 nm is fabricated and characterised.
10.	Dai, D., et al. (författare) Low-index-material-based nano-slot waveguide with quasi-Bragg-reflector buffer 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:23, s. 1554- Tidskriftsartikel (refereegranskat)abstract A low-index-material-based nano-slot waveguide based on a quasi-Bragg-reflector buffer is presented. This quasi-Bragg-reflector buffer includes alternating low and high refractive index dielectric layers. The thicknesses of these dielectric layers are chosen optimally by using a genetic algorithm so that the leakage loss of the present optical waveguide is minimised. An SiO2-based slot-waveguide is designed as an example and the quasi-Bragg-reflector buffer is formed by using several Si/SiO2 bilayers. The theoretical leakage loss for an SiO2-based slot-waveguide with three optimised Si/SiO2 bilayers is about 0.01 dB/mm (at 1550 nm). The modal analysis with a full-vectorial finite-difference method shows that the present slot waveguide has an enhancement of the field distribution in the nano-slot region.
11.	Du, Lin, et al. (författare) Doppler spectrogram analysis of human gait via iterative adaptive approach 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:3, s. 186-189 Tidskriftsartikel (refereegranskat)
12.	Duong, Quang Trung, et al. (författare) Performance Analysis of Selection Decode-and-Forward Relay Networks 2008 Ingår i: Electronics Letters. - : The Institute of Engineering and Technology. - 0013-5194 .- 1350-911X. ; 44:20, s. 1206-07 Tidskriftsartikel (refereegranskat)abstract The performance of decode-and-forward (DF) cooperative networks with relay selection is presented. Specifically, we derive closed-form expressions for symbol error probability (SEP), bit error rate (BER), and achievable spectral efficiency of DF relay selection system in independent but not identically distributed (i.n.i.d.) Rayleigh fading channels taking into account the incapability of decoding the received signals' cyclic redundancy code (CRC) at the relays. We also perform Monte-Carlo simulations to validate the analysis.
13.	Duong, Quang Trung, et al. (författare) Symbol error probability of hop-by-hop beamforming in Nakagami-m fading 2009 Ingår i: Electronics Letters. - : The Institution of Engineering and Technology. - 0013-5194 .- 1350-911X. ; 45:20, s. 1042-1044 Tidskriftsartikel (refereegranskat)abstract The symbol error probability (SEP) of amplify-and-forward(AF) multiple-input multiple-output (MIMO) cooperative networks where beamforming is adopted at both the source and destination is investigated. In particular, the tight lower bound for SEP of AF MIMO relay systems is presented with hop-by-hop beamforming over independent, but not necessarily identically distributed, Nakagami-m fading channels. Furthermore, assessing the high SNR, an asymptotic SEP expression is derived which reveals the array and diversity gain. Numerical results are shown to verify the analysis in some representative scenarios.
14.	Ellgardt, Anders, 1978- (författare) Computing return loss for arbitrary scan directions using limited scan codes for infinite phase arrays 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:13, s. 660-662 Tidskriftsartikel (refereegranskat)abstract Analyzing large phased array antennas using time domain codes is favourable when looking into wideband solutions. This is often done by assuming an infinite array, i.e. a unit cell approach is used. Unfortunately, unit cell based time domain codes using time shifts between cell boundaries have a disadvantage of only being able of analyzing phase shifts corresponding to a beam scanned in the visible space. However, in order to fully characterize the infinite array antenna it is sometimes necessary to compute the active reflection coefficient also for scan directions/phase shifts corresponding to invisible space. Presented in this letter is a new approach on how to do this in a simple manner using unit cell based time domain codes. By extending the size of the computational domain, and include more than one element, phase shifts corresponding to invisible space are included.
15.	Forzati, Marco, et al. (författare) 40 Gbit/s field experiment over 820 km transmission link designed for 10 Gbit/s using APRZ modulation format 2006 Ingår i: Electronics Letters. - 0013-5194 .- 1350-911X. ; 42, s. 991-92 Tidskriftsartikel (refereegranskat)
16.	Forzati, Marco, et al. (författare) Experimental study of single-MZM APRZ transmitters for fibre-optic communications 2008 Ingår i: Electronics Letters. - 0013-5194 .- 1350-911X. ; 44, s. 148-49 Tidskriftsartikel (refereegranskat)
17.	Fu, J. J., et al. (författare) Ultra-long-distance FBG sensor system based on spectrum-limited Fourier domain modelocking fibre laser with Raman pumps 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:16, s. 961-963 Tidskriftsartikel (refereegranskat)abstract A novel ultra-long-distance (up to 76 km) fibre Bragg grating (FBG) sensor system based on a spectrum-limited Fourier domain modelocking fibre laser is proposed. Raman pumps are employed to form a Raman amplifier to compensate the transmission loss of the long fibre and ensure ultra-long-distance sensing. Strain sensing based on such an ultra-long-distance FBG sensor system is demonstrated with a signal-to-noise ratio over 22 dB and a sensitivity of 1.03 pm/mu epsilon in the wavelength domain or 18.3 ns/mu epsilon in the time domain.
18.	Gao, S., et al. (författare) Microwave frequency up/downconversion based on dual-wavelength fibre laser 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:18, s. 932-933 Tidskriftsartikel (refereegranskat)abstract A novel method of microwave frequency up/downconversion is proposed for microwave/millimetre-wave-based radio-over-fibre (RoF) systems. The uplink and downlink are both based on dual-wavelength single-longitudinal-mode fibre laser modulation and heterodyning, which provides the possibility to realise bidirectional RoF transmissions.
19.	Gerschutz, F., et al. (författare) Temperature insensitive 1.3 mu m InGaAs/GaAs quantum dot distributed feedback lasers for 10 Gbit/s transmission over 21 km 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:25, s. 1457-1458 Tidskriftsartikel (refereegranskat)abstract Long wavelength monomode InGaAs/GaAs quantum dot (QD) distributed feedback (DFB) lasers with emission wavelength around 1325 ran are presented. Threshold currents below 19 mA for operating temperatures up to 70 degrees C and Output powers of 10 mW at 25 degrees C (6 mW at 70 degrees C) are observed. Error-free 10 Gbit/s transmission over 21 kin fibre with an extinction ratio of 8.5 dB at room temperature (5.1 dB at 70 degrees C) is demonstrated. The low threshold, low temperature sensitivity and high modulation speed were realised using complex coupled DFB lasers with ten stacks of self-organised MBE-grown QD layers and p-type modulation doping.
20.	Gidlund, Mikael (författare) Precoded closed-loop MIMO-OFDM system using predefined set of rotation matrices 2005 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 41:5, s. 262-263 Tidskriftsartikel (refereegranskat)abstract Multiple-input multiple-output (MIMO) wireless systems obtain large diversity and capacity gains by employing multiple antennas at both the transmitter and receiver side. Proposed is a simple precoded closed-loop MIMO-OFDM system that improves the bit error performance. The proposed scheme only needs a feedback of two bits per OFDM tone for the entire duration of a frame.
21.	Händel, Peter, et al. (författare) Maximum likelihood estimation of reverberation chamber direct-to-scattered ratio 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:25, s. 1285-1286 Tidskriftsartikel (refereegranskat)abstract The exact maximum likelihood estimator of the direct-to-scattered ratio of the Rician channel in a reverberation chamber is derived and its performance analysed. It is shown that the estimator obeys a non-central F-distribution, the mean value and variance of which are derived. For well stirred chambers, it is shown that the systematic error in the estimated ratio may be significant.
22.	Jiang, Biao, et al. (författare) High precision time delay estimation using generalised MVDR cross spectrum 2007 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 43:2, s. 130-131 Tidskriftsartikel (refereegranskat)
23.	Johansson, Christian, et al. (författare) Printable rectifying device using Si-composite 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:1, s. 53-55 Tidskriftsartikel (refereegranskat)abstract The R&D in finding low-cost manufacturing of electronics and electronic components is intense. One research route is aiming at roll-to-roll printing of organic electronics but the typically low mobility in organic semiconductors results in fundamental difficulties to fabricate, e.g., diodes for operation at high frequencies. A novel diode has instead been realised by screen-printing a silicon-powder composite with the intention to utilise the high mobility and the high operation frequency potential of silicon. The current against voltage (I-V) characteristics of the printed device reveal diode behaviour but so far with a too high ideality factor and resistance to be practically useful. By optimising device geometry, composite, and printing process low-cost printed, high frequency diodes (MHz-some GHz) may be viable.
24.	Jorswieck, Eduard (författare) Lack of duality between SISO Gaussian MAC and BC with statistical CSIT 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:25, s. 1466-1468 Tidskriftsartikel (refereegranskat)abstract Recently, the duality between capacity regions of certain single and multiple antenna MAC with SIC and BC with DPC was proved under the assumption of perfect CSI at the transmitter as well as the receiver. Considered is the case in which the transmitter has only statistical CSI.. It is shown that the average rate region of the SISO BC is a subset of the average rate region of the SISO MAC and that there is a lack of duality between the MAC and BC.
25.	Li, Hui, et al. (författare) Extremely compact dual-band PIFAs for MIMO application 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:17, s. 869-U20 Tidskriftsartikel (refereegranskat)abstract A MIMO structure consisting of two extremely compact planar inverted-F antennas (PIFAs) (lambda/60 x lambda/20 x lambda/6) is proposed for GSM 900 MHz and 2.4 GHz wireless local area network applications. The miniaturisation of each antenna is achieved through a spiral-shaped PIFA and a capacitive load, forming a LC resonator. Both antennas have a good impedance bandwidth of 0.88-0.945 and 2.39-2.48 GHz for 0.9 and 2.4 GHz band, respectively. The two PIFA antennas are polarised orthogonally to each other, and isolation better than 228 dB is achieved in both bands without any structure etched on the ground. The predicted results are compared with the measured data and good agreement is found.
26.	Li, Jian, et al. (författare) Covariance beamforming, covariance matrix tapers and matrix beamforming are related 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:5, s. 383-384 Tidskriftsartikel (refereegranskat)abstract It is shown that the covariance beamforming, covariance matrix tapers and matrix beamforming approaches, which were considered separately from one another in the previous array processing literature, are in fact related. The relationships between them in terms of both generality and design procedures are clarified.
27.	Ling, Jun, et al. (författare) On using cyclic algorithms for sinusoidal parameter estimation 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:19, s. 1160-1161 Tidskriftsartikel (refereegranskat)abstract Cyclic algorithms are conceptually simple and computationally efficient methods of estimating the sinusoidal parameters from noisy data. Two such algorithms are compared that are closely related to each other. Their differences are demonstrated using a numerical example.
28.	Liu, F., et al. (författare) On-chip photonic generation of ultra-wideband monocycle pulses 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:24, s. 1247-1248 Tidskriftsartikel (refereegranskat)abstract Proposed and experimentally demonstrated is photonic generation of ultra-wideband (UWB) monocycle pulses using a silicon microring resonator to perform phase-modulation-to-intensity-modulation conversion. The microring resonator features compact size and thus is cost-effective especially for applications in UWB communication systems that support multiple users. As a microring resonator with a pin diode can function as a modulator, the use of the microring resonator to realise bi-phase modulation is discussed.
29.	Lu, Guangyue, et al. (författare) Enhanced interleaved partitioning PTS for peak-to-average power ratio reduction in OFDM systems 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:17, s. 983-984 Tidskriftsartikel (refereegranskat)abstract The independence of the candidates generated in the existing interleaved partitioning partial transmit sequences (IP-PTS) is first investigated. The result shows that these candidates are not fully independent, which leads to performance inferior to the adjacent partitioning PTS (AP-PTS) in which all the generated candidates are mutually independent. To improve the performance of the IP-PTS in peak-to-average power ratio reduction, a novel type of phase sequences for IP-PTS is proposed that can be used to produce fully independent candidates so that IP-PTS can achieve similar performance to AP-PTS, while keeping low complexity.
30.	Luo, G, et al. (författare) Suppressing phosphorus diffusion in germanium by carbon incorporation 2005 Ingår i: Electronics Letters. - : Iet. - 0013-5194 .- 1350-911X. ; 41:24, s. 1354-1355 Tidskriftsartikel (refereegranskat)abstract A problem in the Ge MOSFET process is that the phosphor-us for n-type doping in Ge diffuses very fast. It is very difficult to form the shallow source/drain p-n junctions. It is reported, for the first time, that the phosphorus diffusion in Ge during activation (or annealing) can be suppressed effectively owing to carbon incorporation.
31.	Luthi, S R, et al. (författare) 800/1060 nm Dual-Wavelength Pumped TDFA Using a Single Active Pump Source 2005 Ingår i: Electronics Letters. - 0013-5194 .- 1350-911X. ; 41:25, s. 1366-68 Tidskriftsartikel (refereegranskat)
32.	Ma, Zheng, et al. (författare) Quasi-Maximum-Likelihood Multiple-Symbol Differential Detection for Time-Varying Rayleigh Fading Channel 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:22, s. 1127-1128 Tidskriftsartikel (refereegranskat)abstract The maximum-likelihood multiple-symbol differential detector (ML-MSDD) has better bit-error-rate performance than many other detectors for differential modulation. Unfortunately, the computational complexity of ML-MSDD quickly becomes prohibitive as the observation window size grows. While low-complexity MSDD algorithms for the time-invariant Rayleigh fading channel have been considered before, there is a need for low-complexity MSDD algorithms for general time-varying Rayleigh fading channels. A polynomial-time complexity approach called semi-definite relaxation (SDR) is employed to achieve differential detection with near maximum-likelihood (ML) performance. The proposed SDR quasi-maximum-likelihood (QML) multiple-symbol differential detection (SDR-QML-MSDD) is efficient in that its complexity is polynomial in the observation window size, even in the worst case, while it exhibits almost the same performance as ML-MSDD does.
33.	Marcks von Würtemberg, Rickard, et al. (författare) High-power InGaAs/GaAs 1.3 μm VCSELs based on novel electrical confinement scheme 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:6, s. 414-416 Tidskriftsartikel (refereegranskat)abstract Reported are 1.3 mu m InGaAs/GaAs vertical-cavity surface-emitting lasers (VCSELs) with a novel electrical confinement scheme based on lithographic definition and selective area epitaxial regrowth in the cavity region. More than 6 mW of output power with a record high differential efficiency of more than 70% is emitted from 10 mu m large devices.
34.	Ou, H., et al. (författare) Microwave-photonic frequency doubling utilising phase modulator and fibre Bragg grating 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:2, s. 131-133 Tidskriftsartikel (refereegranskat)abstract A frequency doubling approach for optical generation of tunable microwave and millimetre-wave signals is proposed and verified experimentally. The experimental setup is based on an optical phase modulator and a simple uniform fibre Bragg grating. The generated signal is of high quality and can be tuned.
35.	Persson, K. A., et al. (författare) WCDMA radio-over-fibre transmission experiment using singlemode VCSEL and multimode fibre 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 42:6, s. 372-374 Tidskriftsartikel (refereegranskat)abstract A high-performance singlemode VCSEL developed for analogue applications has been evaluated for use in a radio-over-fibre link for WCDMA in-building distributed antenna systems. The experiment showed penalty-free transmission over a wide range of input RF powers. The ACLR limited the downlink input RF power to less than -13dBm.
36.	Plicanic, Vanja, et al. (författare) Impact of spacing and gain imbalance between two dipoles on HSPA throughput performance 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 45:21, s. 1063-1064 Tidskriftsartikel (refereegranskat)abstract This Letter reports the throughput performance of two parallel half-wavelength dipoles with different antenna spacings and antenna gain imbalances for two frequency bands in a live High-Speed Packet Access (HSPA) network. It was found that an antenna spacing of 0.25 wavelengths and gain imbalances of up to 6 dB are sufficient to provide significant throughput gain for the same transmit power, or equivalently, an increase in network coverage for a given throughput, as compared to a single dipole.
37.	Pougeoise, E., et al. (författare) Strained InGaAs quantum well vertical cavity surface emitting lasers emitting at 1.3 mu m 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:10, s. 584-586 Tidskriftsartikel (refereegranskat)abstract Results on strained InGaAs quantum well vertical cavity surface emitting lasers for optical interconnection applications are reported. Fundamental mode continuous-wave lasing at wavelengths beyond 1300 nm is demonstrated at room temperature. The metal-organic vapour-phase epitaxy grown structure was processed as top p-type distribute Bragg reflector oxide-confined devices.
38.	Rehnstedt, Carl, et al. (författare) Drive current and threshold voltage control in vertical InAs wrap-gate transistors 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 44:3, s. 236-237 Tidskriftsartikel (refereegranskat)abstract Results on fabrication and DC-characterisation of vertical InAs nanowire wrap-gate field-effect transistor arrays with a gate length of 50 nm are presented. Each nanowire array was processed into a transistor with a systematic variation in a number of wires and wire diameter over the sample. Extensive studies have been performed on the influence of wire number and diameter on the transistor characteristics due to a high device yield (84%). In particular it is shown that the threshold voltage depends on the wire diameter, with a change in the order of 5 mV/nm. These results show the possibility of changing the transistor characteristics on the sample by altering the wire dimensions, still using only one patterning and growth sequence.
39.	Rodriguez, Saul, et al. (författare) CMOS RF mixer with digitally enhanced IIP2 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:2, s. 121-123 Tidskriftsartikel (refereegranskat)abstract A new method to enhance the IIP2 of a double-balanced Gilbert cell mixer through digital calibration is presented. The IIP2 calibration method consists of offset voltage cancellation in the switching pairs. The effectiveness of the method has been proven by calibrating a 0.18 mu m CMOS mixer at several combinations of worst-case mismatch conditions and corners. It has been found that the calibrated mixer can achieve its targeted IIP2 specification even at large process, temperature, and power supply variations.
40.	Rohani, Behrooz, et al. (författare) Benefits of Perceptual Speech Quality Metrics in Modern Cellular Systems 2006 Ingår i: Electronics Letters. - London : IEE. - 0013-5194 .- 1350-911X. ; 42:21, s. 1250-1251 Tidskriftsartikel (refereegranskat)abstract Advanced algorithms have become available in recent years that can reliably measure the speech quality as “perceived” by humans. The benefits of applying the perceptual quality measures obtained using these algorithms in the Outer Loop Power Control (OLPC) of Third Generation Universal Mobile Telecommunication System (3G UMTS) are studied in this letter. It is shown that 20% capacity improvement compared to the use of conventional measures can be achieved while an adequate and uniform speech quality is maintained.
41.	Rusu, Ana, et al. (författare) Low-distortion bandpass Sigma-Delta modulator for wireless radio receivers 2005 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 41:19, s. 1044-1046 Tidskriftsartikel (refereegranskat)abstract A low-distortion bandpass sigma-delta modulator is proposed. It was found that the key to improving linearity is to add a feedforward signal path in a double-delay resonator bandpass structure. The proposed technique improves the tonal behaviour even at low oversampling ratio and can be applied for any order of modulator. Based on the proposed architecture, a fourth-order single-bit sigma-delta modulator can achieve a dynamic range of 84 dB and a spurious free dynamic range of 98 dB at 10.71 MHz with a signal bandwidth of 200 kHz, making it ideal for a narrowband IF-sampled wireless receiver designed for compliance with GSM/GPRS standards.
42.	Rönnow, Daniel, et al. (författare) Digital predistortion of radio frequency power amplifiers using a Kautz-Volterra model 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:13, s. 780-782 Tidskriftsartikel (refereegranskat)abstract A digital predistortion algorithm for radio frequency power amplifiers based on orthonormal basis functions is presented. It has the same general properties as a Volterra model, but fewer parameters. Experimentally, using a 3.84 MHz wide signal at 2.14 GHz, the adjacent channel power was suppressed 12 to 15 dB, which was 5 to 7 dB more than a polynomial predistorter.
43.	Song, Jun, et al. (författare) Design and fabrication of compact etched diffraction grating demultiplexers based on alpha-Si nanowire technology 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:13, s. 816-818 Tidskriftsartikel (refereegranskat)abstract alpha-Silicon nanowire waveguides and related techniques are studied. An ultra-compact etched diffraction grating demultiplexer with 10 nm spacing is fabricated and characterised. The dimension of the device is around half a millimetre, which is one to two orders of magnitude smaller than conventional silica based devices.
44.	Söderberg, E., et al. (författare) High speed, high temperature operation of 1.28-μm singlemode InGaAs VCSELs 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:17, s. 978-979 Tidskriftsartikel (refereegranskat)abstract Singlemode 1.28 μm InGaAs VCSELs, with a higher-order mode suppression >30 dB in the temperature range 25-85°C, have been fabricated using an inverted surface relief technique for relaxed fabrication tolerances. High performance 2.5 and 10 Gbit/s modulation is demonstrated in the same temperature range.
45.	Söderström, Ulrik, 1978-, et al. (författare) Asymmetrical principal component analysis for video coding 2008 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:4, s. 276-277 Tidskriftsartikel (refereegranskat)abstract Principal component analysis (PCA) can be used to encode video sequences at extremely low bit rates, e.g. 34.6 dB (PSNR) at 4.2 kbit/s. The same eigenvectors are used for encoding and decoding for this coding. Introduced is a coding scheme where eigenvectors for only part of the video frames are used for encoding but the eigenvectors for the entire frame are used for decoding. This is called asymmetric PCA coding. This reduces the complexity of encoding by ap5 times and at the same time increases the reconstruction quality for the facial part of the video with 0.4 dB (PSNR).
46.	Uz Zaman, Ashraf, 1975, et al. (författare) Dual polarised microstrip patch antenna with high port isolation 2007 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 43:10, s. 551-552 Tidskriftsartikel (refereegranskat)abstract A probe fed stacked microstrip patch antenna for operation in dual polarisation mode is proposed. A slot loaded lower patch is presented to improve isolation between the two polarisation ports. Simulations and measurements show two linear polarisations with an isolation of more than 30 dB within the band 2.5-2.7 GHz. A return loss of -10 dB is achieved within the above-mentioned bandwidth for the proposed antenna. The radiation pattern for the antenna is similar to that of a conventional microstrip antenna and the measured cross-polar level is 16.5 dB below the peak co-polar level within the band 2.5-2.7 GHz.
47.	Wang, Qin, et al. (författare) 1550 nm transmissive/reflective surface-normal electroabsorption modulator arrays 2006 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 42:1, s. 47-48 Tidskriftsartikel (refereegranskat)abstract Arrays of surface-normal 1550 nm transmissive/reflective dual-function electroabsorption modulators based oil InGaAs/InAlAs coupled quantum wells are investigated for free-space and optical fibre communications. The modulators can readily be switched between transmissive or reflective mode by using a removable Au mirror, which provides flexibility in the optical system configuration for different applications. The modulators exhibit contrast ratio of 2:1 at 3 V driving bias and contrast ratio of 2:1 over 30 nm bandwidth at 6 V. The maximum contrast ratio of 4:1 is achieved at a 12 V driving voltage.
48.	Westbergh, Petter, 1981, et al. (författare) 32 Gbit/s multimode fibre transmission using high-speed, low current density 850 nm VCSEL 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 45:7, s. 366 - 368 Tidskriftsartikel (refereegranskat)abstract Error free transmission over multimode fibre at data rates up to 32 Gbit/s at 25C and 25 Gbit/s at 85C using an oxide confined 850 nm VCSEL biased at a current density of 11–14 kA/cm2 is demonstrated. The VCSEL is optimised for high-speed by reducing capacitance and self-heating and by using strained InGaAs quantum wells for high differential gain.
49.	Westbergh, Petter, 1981, et al. (författare) Large aperture 850 nm VCSELs operating at bit rates up to 25 Gbit/s 2008 Ingår i: Electronics Letters. - 1350-911X .- 0013-5194. ; 44:15, s. 907-908 Tidskriftsartikel (refereegranskat)abstract Small signal modulation bandwidths in excess of 20 GHz are demonstrated for a 9 μm oxide aperture VCSEL emitting at 850 nm. Open eye diagrams are obtained under large signal modulation at bit rates up to 25 Gbit/s with a bias current density of only 10 kA/cm2.
50.	Wiklundh, Kia, et al. (författare) Channel capacity of Middleton’s class A interference channel 2009 Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 45:24, s. 1227-1229 Tidskriftsartikel (refereegranskat)abstract Middleton’s class A interference model has properties that make it possible to represent a wide class of interference signals. By choice of model parameters, interference signals ranging from pure Gaussian distributed to pure impulsive interference can be modelled.These properties make the model very useful for a large variety of applications. However, an expression for the channel capacity of the class A interference channel has not yet been published. The channel capacity of this model is derived, and numerical examples are given for some useful sets of model parameters.

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