| 11. |
- Graslund, S, et al.
(author)
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Protein production and purification
- 2008
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In: Nature methods. - : Springer Science and Business Media LLC. - 1548-7105 .- 1548-7091. ; 5:2, s. 135-146
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Journal article (peer-reviewed)
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| 12. |
- Mocchiutti, E., et al.
(author)
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Precision studies of cosmic rays with the PAMELA satellite experiment
- 2009
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In: 2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5. - : IEEE. - 9781424439621 ; , s. 2125-2130
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Conference paper (peer-reviewed)abstract
- The PAMELA satellite experiment was launched into low earth orbit on June 15th 2006. The combination of a permanent magnet silicon strip spectrometer, and a silicon-tungsten imaging calorimeter allows precision studies of the charged cosmic radiation to be conducted over a wide energy range (100 MeV - 200 GeV). A primary scientific goal is to search for dark matter particle annihilations by measuring the energy spectra of cosmic ray antiparticles. Latest results from the PAMELA experiment will be reviewed with a particular focus on cosmic ray antiprotons and positrons. The status of PAMELA measurements for other cosmic ray species will also be reviewed.
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| 13. |
- Mocchiutti, E., et al.
(author)
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The PAMELA space experiment
- 2009
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In: Proceedings of the 44th Rencontres de Moriond - 2009 Electroweak Interactions and Unified Theories, EW 2009. - : Gioi Publishers. ; , s. 317-324
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Conference paper (peer-reviewed)abstract
- The 15th of June 2006, the PAMELA satellite-borne experiment was launched from the Baikonur cosmodrome and it has been collecting data since July 2006. The apparatus comprises a time-of-flight system, a silicon-microstrip magnetic spectrometer, a silicon-tungsten electromagnetic calorimeter, an anticoincidence system, a shower tail counter scintillator and a neutron detector. The combination of these devices allows precision studies of the charged cosmic radiation to be conducted over a wide energy range (100 MeV - 100's GeV) with high statistics. The primary scientific goal is the measurement of the antiproton and positron energy spectrum in order to search for exotic sources, such as dark matter particle annihilations. PAMELA is also searching for primordial antinuclei (anti-helium) and testing cosmic-ray propagation models through precise measurements of the anti-particle energy spectrum and precision studies of light nuclei and their isotopes. Moreover, PAMELA is investigating phenomena connected with solar and earth physics.
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| 14. |
- Papini, P., et al.
(author)
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Latest results from PAMELA
- 2009
-
Conference paper (peer-reviewed)abstract
- The PAMELA experiment is a satellite-borne apparatus designed to study charged particles in the cosmic radiation, with a particular focus on antiparticles. The detector is housed on the Resurs-DK1 satellite and it is taking data since June 2006. The main parts of the apparatus are a magnetic spectrometer, which is equipped with a silicon-microstrip tracking system and which is used to measure the rigidity and the charge of particles, and a silicon/tungsten electromagnetic calorimeter which provides particle identification. The main results about the antiparticles component of cosmic rays obtained during the first 500 days of data taking are summarized here.
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| 15. |
- Wang, Qi, et al.
(author)
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Cost Analysis of Channel Estimation in MIMO-OFDM for Software Defined Radio
- 2008
-
In: WCNC 2008: IEEE WIRELESS COMMUNICATIONS & NETWORKING CONFERENCE. - : IEEE. - 9781424419968 ; , s. 935-939
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Conference paper (peer-reviewed)abstract
- Channel State Information (CSI) is critical for the overall performance or wireless systems. Meanwhile, the estimation or CSI forms one or the most intensive tasks in radio baseband signal processing. This paper investigates the real-time implementation or channel estimation for MIMO-OFDM systems using programmable hardware aimed for software defined radio. Based on the programmable hardware architecture proposed by us, several prevalent channel estimation methods such as Least Square (LS), Minimum Mean Square Error (MMSE) and Pilot-Symbol-Aided (PSA) are evaluated from both the performance and computational latency perspectives. By utilizing the symmetric feature of the covariance matrix, a simplified two-sided Jacobi rotation method is adopted to speed up the complex-valued singular value decomposition involved in the MMSE channel estimation.
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| 16. |
- Wu, Di, 1979-, et al.
(author)
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A Programmable Lattice-Reduction Aided Detector for MIMO-OFDMA
- 2008
-
In: 4th IEEE International Conference on Circuits and Systems, ICCSC,2008. - : IEEE. - 9781424417087 - 9781424417070 ; , s. 293-297
-
Conference paper (peer-reviewed)abstract
- This paper presents the first programmable Lattice- Reduction Aided (LRA) symbol detector for Multiple-Input Multiple-Output (MIMO) and Orthogonal Frequency Division Multiple Access (OFDMA). The detector proposed is implemented using 65 nm ASIC technologies. Owing to the programmability, the detector can be dynamically switched between linear (e.g. MMSE) and lattice-reduction aided (e.g. LRA-MMSE) detectors by simply running another software subroutine. Therefore, it allows a good trade-off between performance and computational latency to be achieved under various scenarios. Along with the hardware, two algorithm simplifications (SCNT-LR and SOT-LR) are proposed for finding subcarriers with ill- conditioned channel matrices. And in the end, interpolated LR (I- LR) is proposed to further reduce the computational complexity for real-time implementations.
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| 17. |
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| 18. |
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| 19. |
- Wu, Di, 1979-, et al.
(author)
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Evaluation of MIMO Symbol Detectors for 3GPP LTE Terminals
- 2009
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In: 17th European Signal Processing Conference (EUSIPCO).
-
Conference paper (peer-reviewed)abstract
- This paper investigates various MIMO detection methods for 3GPP LTE open-loop downlink multi-antenna transmission. Targeting VLSI implementation, these detection methods are evaluated with respect to complexity and detection performance. A realistic 3GPP LTE simulation chain is developed for the evaluation. The result shows that with the aid of Hybrid Automatic Repeat reQuest (H-ARQ), a recently proposed reduced complexity close-ML detector called MFCSO achieves a good tradeoff between achievable throughput and complexity. An adaptive transmission and detection scheme is also proposed based on user scenarios.
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| 20. |
- Wu, Di, 1979-, et al.
(author)
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Fast Complex Valued Matrix Inversion for Multi-User STBC-MIMO Decoding
- 2007
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In: IEEE Computer Society Annual Aymposium on VLSI, ISVLSI,2007. - : IEEE. - 0769528961 ; , s. 325-330
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Conference paper (peer-reviewed)abstract
- This paper studies the efficient complex matrix inversion for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) and its programmable VLSI implementation are proposed for the inversion of (in this context) large complex matrices with Alamouti sub-blocks. Our solution significantly reduces the number of operations which makes it more than 4 times faster than several other solutions in the literature. Furthermore, compared to these fixed function VLSI implementations, our solution is more flexible and consumes less silicon area because the hardware can be reused for many other operations. In addition to the routine analysis of the general computational complexity based on the number of basic operations, the computational latency is also measured in clock cycles based on the conceptual hardware for real-time matrix inversion.
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