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Low complexity lattice reduction scheme for STBC two-user uplink MIMO systems

EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2011年第1期2011卷 1-10页

作者： An, Chan-ho Lee, Taekjoo Yang, Janghoon Kim, Dong Ku Yonsei Univ Sch Elect & Elect Engn Seoul 120749 South Korea LG Elect Mobile Handset R&D Ctr Seoul 135023 South Korea Korean German Inst Technol Dept Newmedia Seoul 157030 South Korea

Recently, a lattice reduction-aided (LRA) multiple-input multiple-output detection scheme has been proposed in junction with linear (as well as nonlinear) detectors. It is well known that these schemes provide a full diversity, and its complexity is comparable to that of linear detectors for the block fading channels. For the fast varying channels, however, the decoding complexity of LRA detection scheme is unreasonably high. This article proposes an efficient iterative lattice reduction (LR) scheme for an uplink system with two receive antennas at the base station and two users, each employing the Alamouti space-time block code (STBC). By taking advantage of the certain inherent STBC structure of transmitted symbols from users, the proposed scheme provides the same performance as a conventional LR while saving about 80% computational complexity. We also show that it can be successfully extended to handle the scenario where another interfering user, who is also employing the Alamouti STBC, is present.

关键词： plink MIMO space-time block coding lattice reduction low complexity co-channel interference

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Diversity Combining Scheme for time-Varying STBC NGSO Multi-Satellite Systems

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IEEE COMMUNICATIONS LETTERS 2024年第4期28卷 882-886页

作者： Singh, Vibhum Eappen, Geoffrey Martins, Wallace A. Palisetty, Rakesh Rojas, Carlos Luis Marcos Gonzalez-Rios, Jorge Luis Vasquez-Peralvo, Juan A. Krivochiza, Jevgenij Merlano-Duncan, Juan Carlos Socarras, Luis Garces Chatzinotas, Symeon Ottersten, Bjorn Univ Luxembourg Interdisciplinary Ctr Secur Reliabil Trust SnT L-1855 Luxembourg City Luxembourg Univ Toulouse ISAE SUPAERO F-31400 Toulouse France Eminence Deemed be Univ Shiv Nadar Inst Dept Elect Engn Delhi NCR Greater Noida 201314 India

Current trends in non-geostationary orbit (NGSO) satellite communications pose the challenge of attaining high spectral efficiency with low-complexity user terminals (UTs). In this context, this letter investigates the downlink/forward transmission of linear space-time block coded (STBC) signals through multiple geographically distributed NGSO satellites. As such, by combining the signals through multiple satellites, STBC provides a diversity advantage, which helps in combating the adverse effects of fading and interference at the UT. The main challenge of implementing such a scheme is the lack of time synchronization and the interference effect through a multi-satellite system toward the UT. To address this issue, we propose a digital receiver structure with multiple branches specifically designed to lock onto each satellite of the multi-satellite system, thus providing a solution for simple UT without requiring additional complexity in terms of radio-frequency components. Herein, we consider the zero-forcing (ZF) based diversity combining scheme while deriving the signal-to-interference-plus-noise ratio (SINR) expression at UT. Our results demonstrate the SINR improvement brought by the ZF combiner.

关键词： Satellite broadcasting Diversity reception Interference Satellites Symbols Signal to noise ratio Satellite antennas Diversity combining non-geostationary orbit satellite communication systems space-time block coding time misalignment zero-forcing

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Blind decoders for linear dispersion codes in downlink DS-CDMA systems

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IEEE COMMUNICATIONS LETTERS 2002年第7期6卷 285-287页

作者： Liu, JH Host-Madsen, A Univ Hawaii Dept Elect Engn Honolulu HI 96822 USA

Among many proposed space-time codes, the linear dispersion (LD) space-time codes possess many coding advantages and retain a simple decoding at the same time. in this letter, an LD decoder combined with a blind subspace-based multiuser detector (MUD) is studied in the downlink of a DS-CDMA system. To further improve the performance, a subspace-based sphere decoding algorithm is proposed. At last, a decimation-combining processing is applied to the proposed subspace-based blind decoders to reduce the complexity with only slight performance loss.

关键词： group-blind multiuser detection space-time block coding sphere decoding subspace

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A space-time block Coded Spatial Modulation From (n, k) Error Correcting Code

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IEEE WIRELESS COMMUNICATIONS LETTERS 2014年第1期3卷 54-57页

作者： Wang, Lei Chen, Zhigang Wang, Xia Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Peoples R China

In this letter, a high-rate space-time block coded (STBC) spatial modulation (SM) scheme called STBC-SM(n, k) is presented, in which according to the codewords of the (n, k) error correcting code (ECC), different pairs of antennas are activated to transmit STBC. For nT = 2n transmit antennas, the STBCSM(n, k) scheme can achieve the flexible transmission rates. Furthermore, two rotation angles are optimized to guarantee the transmit diversity of two for STBC-SM(n, k). Owing to the orthogonality of STBC, the new design enables a low-complexity maximum likelihood (ML) decoder. Simulation results are presented to verify the performance of the proposed scheme.

关键词： MIMO systems space-time block coding spatial modulation transmit diversity

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Performance Analysis of STBC-Based MIMO PLC System in Cyclostationary Noise Environment

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第8期71卷 9026-9031页

作者： Dash, Soumya P. Bhuyan, Jashaswini Mallik, Ranjan K. Indian Inst Technol Bhubaneswar Sch Elect Sci Argul Khordha 752050 Odisha India Indian Inst Sci Dept Elect Commun Engn Bengaluru 560012 India Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India

The paper proposes a multiple-input multiple-output-based power line communication (PLC) system subject to Rayleigh fading and corrupted by additive cyclostationary Gaussian noise. The proposed coherent receiver structure employs a block reception rule at the reception unit for detecting the space-time block-coded transmitted data symbols. A closed-form expression for the pairwise error probability (PEP) is derived using a characteristic function approach. Exact and asymptotic expressions for the average PEP are obtained for the special case of Alamouti code transmission which show that the PLC system under consideration offers full diversity. Numerical results depict the improvement in the system performance with increase in the number of receive diversity branches and the average signal-to-noise ratio per branch and decrease in the correlation value between the noise samples.

关键词： Receivers Symbols Indexes Codes MIMO communication Data communication Reliability Coherent detection cyclostationary noise multiple-input multiple-output pairwise error probability (PEP) powerline communication space-time block coding

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GRP-based interleaver for IDMA systems over frequency selective channel

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ELECTRONICS LETTERS 2015年第18期51卷 1462-U66页

作者： Belaoura, W. Djeddou, M. Ghanem, K. EMP Commun Syst Lab Algiers Algeria CDTA Syst Architecture Lab Algiers Algeria

An interleave-division multiple-access (IDMA) system supports the presence of multiple users in a cell by resorting to a different interleaver per user. Therefore the choice of the interleaver critically impinges on system performance. A new interleaver structure is proposed for the so-called STBC-OFDM-IDMA [space-time block coding (STBC), orthogonal frequency division multiplexing (OFDM) and IDMA] architecture, combining the viable features of the STBC, the OFDM and the IDMA techniques. This interleaver is based on the new idea of adopting permutation control keys generated using two cryptography elliptic curves in which the degree of randomness of the interleaved sequence is scalable by using several rounds and a different subkey in each round. In addition to offering a certain degree of data security, it is shows through simulation results that the resulting architecture incorporating the proposed interleaver yields a viable bit error rate performance.

关键词： telecommunication security space-time block codes error statistics interleaved codes multi-access systems OFDM modulation wireless channels public key cryptography GRP-based interleaver interleave division multiple access system frequency selective channel STBC-OFDM-IDMA architecture space-time block coding orthogonal frequency division multiplexing permutation control elliptic curve cryptography data security bit error rate BER

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Blind Identification of Spatial Multiplexing and Alamouti space-time block Code via Kolmogorov-Smirnov (K-S) Test

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IEEE COMMUNICATIONS LETTERS 2014年第10期18卷 1711-1714页

作者： Mohammadkarimi, Mostafa Dobre, Octavia A. Mem Univ Newfoundland Fac Engn & Appl Sci St John NF A1B 3X5 Canada

A novel algorithm for blind identification of spatial multiplexing and Alamouti space-time block code is proposed in this paper. It relies on the Kolmogrov-Smirnov test, and employs the maximum distance between the empirical cumulative distribution functions of two statistics derived from the received signal. The proposed algorithm does not require estimation of the channel coefficients, noise statistics and modulation type, and is robust to the carrier frequency offset and impulsive noise. Additionally, it outperforms the algorithms in the literature under a variety of transmission impairments.

关键词： Signal identification Kolmogrov-Smirnov test space-time block coding multiple antenna systems

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Burst-based orthogonal ST block coding for CPM

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第4期6卷 1208-1212页

作者： Silvester, A.-M. Schober, R. Lampe, L. Univ British Columbia Vancouver BC V6T 1Z4 Canada

In this paper, we propose a simple orthogonal space-time block coding (OSTBC) technique for continuous-phase modulation (CPM). Although the straightforward combination of orthogonal designs (ODs) and CPM was deemed impossible in [11, [2], we show that this is easily accomplished with a burst-based approach. In fact, using the proposed technique ODs can be combined with any CPM scheme. After an appropriate ST combining at the receiver, the same detection techniques as in case of single-antenna transmission can be applied. This is a significant advantage over previously proposed ST coding schemes for CPM. We also derive accurate approximations for the bit error rate and the frame error rate of CPM with OSTBC. Both analysis and simulations show in good agreement the excellent performance of the proposed scheme.

关键词： space-time block coding continuous-phase modulation fading channels diversity

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Performance of space-time block coded MC-CDMA in Nakagami fading channels

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ELECTRONICS LETTERS 2003年第2期39卷 222-224页

作者： Li, ZX Latva-aho, M Oulu Univ Ctr Wireless Commun FIN-90014 Oulu Finland

The performance of a space-time block coded multicarrier code-division multiple-access (MC-CDMA) system operating in Nakagami-m fading channels is investigated. A new explicit closed form expression for bit error prob... 详细信息

关键词： Mobile radio systems space-time block coding computer simulations explicit closed form expression mobile radio mobile radio communication systems multicarrier code-division multiple-access Codes Nakagami fading channels fading channels error statistics space-time codes code division multiple access Multiple access communication bit error probability block codes

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An adaptive transmission protocol for exploiting diversity and multiplexing gains in wireless relaying networks

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2015年第1期2015卷 1-15页

作者： El Astal, Mohammed Taha O. Abu-Hudrouss, Ammar M. Salmon, Brian P. Olivier, Jan Corne Univ Tasmania Sch Engn Hobart Tas 7001 Australia Univ Tasmania ICT Hobart Tas 7001 Australia IUG Univ Dept Elect Engn Gaza Israel

Wireless relaying networks with distributed space-time block codes have been shown to provide high link reliability. This is because of the space diversity gain from multiple transmitting relays, which improves by adding more relays. The drawback of this approach is the overall reduction in throughput of the network. In this paper, we propose a method to construct a distributed space-time block code that is combined with spatial modulation to find a flexible trade-off between reliability and throughput. This proposed method is not restricted to a specific number of relays and can be constructed as necessary. The constructed code also uses a novel adaptive transmission protocol to achieve higher space diversity, even with relays equipped with a single antenna. This protocol assumes use of coherent detection, meaning that a perfect channel estimation is available at the destination. Lastly, a new decoder is proposed that offers significant reduction in complexity to maintain high data throughput. All claims in this work are supported with theoretical analysis and backed up with empirical results.

关键词： Spatial modulation Spatial diversity Wireless relaying networks space-time block coding

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