1,721,270 research outputs found
Dataset supporting the University of Southampton Doctoral Thesis "Wireless localization in millimeter wave systems"
No full textDataset supporting the University of Southampton Doctoral Thesis "Wireless localization in millimeter wave systems"
This dataset includes matlab files, which can produce all results figures in the thesis. The data is sorted in four files: Paper 1 (Data and Plot and results figures), Paper 2 (Data and Plot and results figures), Paper 3 (Data and Plot and results figures) and Thesis Background data.
This work was supported in part by the Engineering and Physical Sciences Research Council (EPSRC) Project under Grant EP/P034284/1
and Grant EP/P034284/1.
Related publication:
Li, Kunlun, El-Hajjar, Mohammed and Yang, Lie-Liang (2021) Millimeter-wave based localization using a two-stage channel estimation relying on few-bit ADCs. IEEE Open Journal of the Communications Society. (In Press)
https://eprints.soton.ac.uk/450487/</span
Receiver Multiuser Diversity Aided Multi-Stage MMSE Multiuser Detection for DS-CDMA and SDMA Systems Employing I-Q Modulation
Get PDFThe so-called receiver multiuser diversity aided multistage minimum mean-square error multiuser detector (RMD/MS-MMSE MUD), which was proposed previously by the author, is investigated in the context of the direct-sequence code-division multiple-access (DS- CDMA) and space-division multiple-access (SDMA) systems that employ in- and quadrature-phase (I-Q) modulation schemes. A detection scheme is studied, which is operated in real domain in the principles of successive interference cancellation (SIC). The concept of noise recognition factor (NRF) is proposed for explaining the efficiency of SIC-type detectors and also for motivating to design other high-efficiency detectors. The achievable bit error rate (BER) performance of the RMD/MS-MMSE MUD is investigated for DS-CDMA and SDMA systems of either full-load or overload, when communicating over Rayleigh fading channels for the SDMA and over either additive white Gaussian noise (AWGN) or Rayleigh fading channels for the DS-CDMA. The studies and performance results show that the RMD/MS-MMSE MUD is a highly promising MUD. It has low implementation complexity and good error performance. Furthermore, it is a high-flexibility detector suitable for various communication systems operated in different communication environments
Multicarrier Communications
No full textBenefiting from both time–domain and frequency–domain signal processing techniques, multicarrier systems have the potential for achieving high spectral–efficiency, high–flexibility and low–complexity wireless communications. Multicarrier techniques therefore constitute the promising techniques for implementation of future generations of wideband, broadband and ultra–wideband systems. Multicarrier Communications offers comprehensive and in–depth evaluation of numerous topics in the area, covering the fundamental principles of spread–spectrum and multicarrier CDMA as well as more advanced topics such as multiuser detection (MUD), multiuser transmitter preprocessing (MUTP), MIMO and space–time processing. It examines OFDM and various multicarrier CDMA within an unified framework and provides analytical approaches and formulas for error–performance evaluation of numerous multicarrier systems. * Examines MUD and MUTP in parallel to illustrate the strong duality between receiver optimization and transmitter optimization * Comprehensively establishes the theory of noncoherent MUD and noncoherent interference suppression * Details the body of knowledge on MIMO theory and space–time multicarrier communications * Contains tables, diagrams and figures to illustrate the performance results. Practicing electrical engineers and researchers in wireless communications will find Multicarrier Communications an invaluable guide. It will also be of interest to senior undergraduate and graduate students on wireless communications courses
Performance of MMSE Multiuser Detection in Cellular DS-CDMA Systems Using Distributed Antennas
No full textIn this contribution we propose and investigate a high-capacity cellular direct-sequence code-division multiple-access (DS-CDMA) wireless communications system, where numerous antennas are distributed in the area covered by the system. The bit error rate (BER) performance of the distributed antenna cellular DS-CDMA system is investigated, when minimum mean-square error (MMSE) multiuser detection is employed, and when transmission pass-loss, lognormal shadowing slow fading and Nakagami-m fast fading are considered. Our study suggests that the distributed antenna cellular DS-CDMA system constitutes a high power-efficiency wireless system. For utilizing the same set of system parameters, it is capable of providing an extremely higher capacity, than the cellular DS-CDMA system designed based on the conventional cellular concepts. Furthermore, the proposed distributed antenna cellular system can be operated without having to use power-control
A zero-forcing multiuser transmitter preprocessing scheme for downlink communications
No full textIn this letter a multiuser transmitter preprocessing (MUTP) approach is proposed for downlink wireless communications, such as in spatial-division multiple-access (SDMA) or direct-sequence code-division multiple-access (DS-CDMA) system. In the proposed MUTP the preprocessing matrix is obtained by constructing a subspace that is orthogonal to the interference subspace without relying on eigen-analysis. The proposed MUTP fully removes the downlink multiuser interference, resulting in the zero-forcing (ZF) solution. It is capable of achieving the same bit error rate (BER) performance as the conventional ZF-based MUTP (ZF-MUTP)
Downlink MBER beamforming transmitter based on uplink MBER beamforming receiver for TDD-SDMA systems
No full textThe downlink minimum bit error rate (MBER) transmit beamforming is directly derived based on the uplink MBER receive beamforming for time division duplex (TDD) space-division multiple-access (SDMA) multiple-input multiple-output systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs). It is shown that the relationship between multiuser detection and multiuser transmission can still be applied for the rank-deficient system where the number of users supported is more than the number of transmit antennas available at the BS, if the MBER design is adopted. The proposed MBER transmit beamforming scheme is capable of achieving good performance for rank-deficient TDD-SDMA systems with the support of low-complexity and high power-efficient MTs, and its robustness to the downlink and uplink noise or channel mismatch is verified using simulation
Performance of DS-CDMA systems using M-ary orthogonal codes with selection diversity combining
No full textDownlink MBER transmit beamforming design based on uplink MBER receive beamforming for rank-deficient TDD-SDMA systems
No full textThe downlink minimum bit error rate (MBER) transmit beamforming is directly designed based on the uplink MBER receive beamforming solution for time division duplex (TDD) space-division multiple-access (SDMA) induced multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs). It is shown that the dual relationship between multiuser detection and multiuser transmission can be extended to the rank-deficient system where the number of users supported is more than the number of transmit antennas available at the BS, if the MBER design is adopted. The proposed MBER transmit beamforming scheme is capable of achieving better performance over the standard minimum mean square error transmit beamforming solution with the support of low-complexity and high power-efficient MTs, particularly for rank-deficient TDD-SDMA MIMO systems. The robustness of the proposed MBER transmit beamforming design to the downlink and uplink noise or channel mismatch is investigated using simulation
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