| 1. |
- Chen, Jingjing, 1982, et al.
(författare)
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Does LO Noise Floor Limit Performance in Multi-Gigabit Millimeter-Wave Communication?
- 2017
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Ingår i: IEEE Microwave and Wireless Components Letters. - 1558-1764 .- 1531-1309. ; 27:8, s. 769-771
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Tidskriftsartikel (refereegranskat)abstract
- Extremely high data rate communication can potentially be achieved by combining high-order modulations and wide bandwidths at millimeter-wave (mm-wave) frequencies. However, it has been challenging to practically implement this combination, even if the SNR of the system appears to be sufficiently high. An explanation from a recent theoretical study is that the practical data rates in mm-wave systems are limited by the local oscillator (LO) white phase noise. In this letter, we present an experimental investigation on whether the white noise floor of frequency multiplied LO sources is a major noise contribution to wideband signals. Hardware measurements are performed using multi-gigabit 64 quadrature amplitude modulation (QAM) signals. The measured results show that the transmitter performance degrades as the LO noise floor increases. Hence, the LO noise floor is identified to be one primary limitation for achieving the highest possible data rate in wideband mm-wave systems.
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| 2. |
- Chen, Jingjing, 1982, et al.
(författare)
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Influence of White LO Noise on Wideband Communication
- 2018
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 66:7, s. 3349-3359
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Tidskriftsartikel (refereegranskat)abstract
- Applying a spectrally efficient modulation to a wideband signal provides an extremely high data rate potential in millimeter-wave communication. In reality, wideband systems, as reported in open literature, typically suffer from insufficient signal-to-noise ratio (SNR) and thus are not able to support high-order modulation. In a recent experimental study, we have identified that a high noise floor from frequency-multiplied local oscillator (LO) sources is a major data rate limitation in wideband systems. In this paper, we present a detailed study with a mathematical model to describe the influence of the LO noise on a communication signal through frequency conversion. Followed by experimental investigations using multigigabit 64-quadrature amplitude modulation signals, measurements are performed at frequency up- and down-conversions. Both cases show SNR degradation on the frequency-converted signals as the corresponding LO noise floor increases. We provide experimental proof that the nature of the LO noise floor is white, with nearly the same amount of phase and amplitude noises. Various ways to reduce the white LO noise floor through the new hardware design are discussed providing design requirements and considerations.
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| 3. |
- Chen, Jingjing, 1982, et al.
(författare)
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A data-rate adaptable modem solution for millimeter-wave wireless fronthaul networks
- 2015
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Ingår i: 2015 IEEE International Conference on Communication Workshop, ICCW 2015. - 2164-7038. - 9781467363051 ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- For dense small cell deployment in centralized baseband architecture, wireless fronthaul is a cost efficient and flexible alternative to fiber-based fronthaul links. Due to the available wide bandwidth, millimeter-wave technology is the most promising choice to realize multi-gigabit wireless transmission of the common public radio interface (CPRI). In this paper, we present a novel differential encoding scheme for differential quadrature phase-shift keying (D-QPSK) modulation, which enables data-rate adaptable CPRI transmission without modification of a standard receiver. A multi-rate D-QPSK modulator/demodulator (modem) is implemented and tested for data rates up to 10 Gbps, limited by the bandwidth of the microwave components in use. This modem is verified to fulfill the CPRI specifications with respect to multi-rate, low latency and high system performance. Therefore, it is proposed for the implementation of wireless CPRI links at millimeter-wave bands.
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| 4. |
- Hallin, Joakim, 1965, et al.
(författare)
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A 100-Gb/s 1:4 Demultiplexer in InP DHBT Technology
- 2006
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Ingår i: IEEE Compound Semiconductor Integrated Circuit Symposium, Technical Digest 2006, 12-15 November 2006, San Antonio, TX, USA. - 1424401267 ; , s. 227-230
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Konferensbidrag (refereegranskat)
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| 5. |
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| 6. |
- Hallin, Joakim, 1965, et al.
(författare)
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A 165-Gb/s 4:1 Multiplexer in InP DHBT Technology
- 2006
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Ingår i: IEEE Journal of Solid-State Circuits. - 0018-9200. ; 41:10, s. 2209-2214
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a 4:1 multiplexer fabricated in InP double heterojunction bipolar transistor (DHBT) technology. The multiplexer works up to 165 Gb/s at a supply voltage of -3.2 V consuming 1.6 W. It is a half-rate multiplexer using a multi-phase clock architecture. The main design challenge was to ensure correct timing between clock and data signals. © 2006 IEEE.
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| 7. |
- He, Zhongxia Simon, 1984, et al.
(författare)
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A 14 Gbps On-/Off- Keying Modulator in GaAs HBT Technology
- 2012
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Ingår i: IEEE Microwave and Wireless Components Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-1764 .- 1531-1309. ; 22:5, s. 272-274
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Tidskriftsartikel (refereegranskat)abstract
- A proof of concept on-/off- keying (OOK) modulator is designed and implemented in a commercial heterojunction bipolar transistors IC process. The modulator circuit consists of an amplifier/latch structure, which is used as an OOK modulator for the first time. One of its advantages is that the topology may be implemented in both field effect transistor and bipolar technology. The measurement results correspond well with simulation and show that the modulator is capable of handling carrier frequencies up to 28 GHz, and data rates up to 14 Gbps. The isolation of the modulator in the off-state is better than 27 dB over the whole frequency range.
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| 8. |
- He, Zhongxia Simon, 1984, et al.
(författare)
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A 15-Gb/s 8-PSK Demodulator With Comparator-Based Carrier Synchronization
- 2015
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 63:8, s. 2630-2637
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a novel 8-phase-shift-keying (8-PSK) carrier recovery and demodulation method using a comparator and frequency divider is proposed. A proof-of-concept 8-PSK demodulator for high-data-rate millimeter-wave communication systems is designed and tested, which can support 8-PSK transmission up to 15 Gb/s with a bit error rate less than 10-7
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