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Burst-based orthogonal ST block coding for CPM

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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space-time block coding iterative multiuser receiver

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JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 2003年第1期12卷 19-30页

作者： Jiang, HR Kwak, KS Inha Univ Dept Elect Engn Inchon 402751 South Korea

We present a multiuser receiver for CDMA systems with the combination of turbo channel coding and space-time block coding. A turbo scheme based on multiuser detection, soft interference cancellation and decoding is provided, and the algorithms for space-time decoding and separately interference suppressing are derived in this paper. The multiuser detection consists of multiuser interference suppression and single-user space-time decoding. Then we develop the iterative multiuser receiver based on the soft estimates of the interfering users' symbols. Moreover, simulation is given to verify the effectiveness of the multiuser receiver.

关键词： space-time block coding interference cancellation multiuser receiver CDMA

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A blind CM receiver for STBC over channels with inter-symbol interference

A blind CM receiver for STBC over channels with inter-symbol...

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7th IEEE International Symposium on Signal Processing and Information Technology

作者： Bendoukha, Samir Weiss, Stephan Univ Strathclyde Inst Commun & Signal Proc Glasgow G1 1XW Lanark Scotland

ISBN: (纸本)9781424418343

Alamouti's space-time block coding (STBC) scheme has received considerable attention due to its ability to maximize the diversity gain of a Multi-Input-Multi-Output (MIMO) transmission link. For frequency selective fading, only a few receivers can be found in the literature. These are mainly trained and block based, such as time Reversal STBC (TRSTBC), introduced by [3], [4]. In order to ultimately achieve better tracking behavior, this paper focuses on the development or a non-block-based method. The Constant Modulus (CM) criterion is utilized on the received signals with the orthogonality constraint of the transmitted STBC signals. A novel criterion is derived to enforce the STBC structure on the equalizer outputs and consequently minimize the cross-correlation. Simulation results are presented to demonstrate the performance of the proposed algorithm.

关键词： space-time block coding STBC constant modulus criterion blind equalization frequency selective fading orthogonality

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Minimizing the number of dropped users in MIMO multicasting channels

Minimizing the number of dropped users in MIMO multicasting ...

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IEEE Military Communications Conference (MILCOM 2007)

作者： Wang, Jianqi Love, David J. Zoltowski, Michael D. Purdue Univ Sch Elect & Comp Engn Elect W Lafayette IN 47907 USA

ISBN: (纸本)9781424415120

For multicasting applications over multiple-input multiple-output (MIMO) channels with certain kind of QoS requirement, it is more suitable to design a strategy that minimizes the number of the dropped users during one multicasting session. The immediate benefit of this strategy would be to effectively improve the outage capacity of each receiver. The major contribution of our paper is a precoded space-time block coding (STBC) strategy that can minimize the number of the dropped users for MIMO multicasting channels. We assume that the MIMO channel is narrow band with flat fading. The transmitter has full knowledge of the channel state information of every subscribed users. By approximating the indicator function with the sigmoid function and employing an iterative procedure, we are able to solve this problem using standard convex optimization techniques. Simulation results shows that this new scheme outperforms all existing methods including the open-loop STBC and beamforming.

关键词： multicasting MIMO beamforming space-time block coding

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On decoupling of quasi-orthogonal space-time block codes based on inherent structure

On decoupling of quasi-orthogonal space-time block codes bas...

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16th IST Mobile and Wireless Communications

作者： Kapinas, Vasilios M. Karagiannidis, George K. Aristotle Univ Thessaloniki Dept Elect & Comp Engn GR-54006 Thessaloniki Greece

ISBN: (纸本)9781424416622

In this paper we propose a linear decoupling scheme for multiple-input multiple-output (MIMO) antenna systems where spatial diversity is exploited through complex orthogonal (COD) or quasi-orthogonal (CQOD) designs. The proposed scheme is based on rewriting the space-time block code (STBC) in an alternative form via generalized permutation matrices (GPM) and transforming the original system to an equivalent one, where all the transmitted symbols are decoupled, allowing thus a single symbol or symbol pair-wise maximum likelihood decoding (MLD) through a closed form expression (CFE).

关键词： space-time block coding quasi-orthogonal designs maximum-likelihood decoding generalized permutation matrices wireless communications

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Improved performance for hybrid STBC and spatial multiplexing OFDM systems with linear receivers

Improved performance for hybrid STBC and spatial multiplexin...

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18th IEEE International Symposium on Personal, Indoor and Mobile Radio Communication

作者： Zhou, Liang Oishi, Yasuyuki Fujitsu Labs Ltd YRP R&D Ctr Yokosuka Kanagawa 2390847 Japan

ISBN: (纸本)9781424411436

In this paper, we study a practical design for hybrid space-time block coding (STBC) and spatial multiplexing (SM) with orthogonal frequency division multiplexing (OFDM) systems. The hybrid STBC-SM OFDM systems can achieve both spatial diversity and multiplexing gains simultaneously in frequency selective MIMO channels. For the hybrid designs, zero forcing (ZF) and minimum mean square error (MMSE) linear receivers are derived by a simple transformation. To improve error rate performance, we propose weighted soft decision Viterbi decoding by using the SINR of the transformed equivalent channel matrix. The proposed scheme can mitigate noise enhancement inherent to ZF and MMSE linear detectors. Extensive simulations show that the proposed technique with low complexity exhibit robust performance improvement for different propagation channels and modulations.

关键词： space-time block coding spatial multiplexing MIMO-OFDM signal to interference noise ratio weighted Viterbi decoding ZF MMSE

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time Synchronization Issues for Quasi-Orthogonal space-time block Codes

Time Synchronization Issues for Quasi-Orthogonal Space-Time ...

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International Workshop on Satellite and space Communications

作者： Kapinas, Vasilios M. Horvath, Peter Karagiannidis, George K. Frigyes, Istvan Aristotle Univ Thessaloniki Thessaloniki Greece Budapest Univ Technol & Econ Budapest Hungary

ISBN: (纸本)9781424409389

This paper deals with some of the problems arising in multiple-input multiple-output (MIMO) antenna systems, when the receiver's clock is not synchronized to the modulator. Considering that the spatial diversity is exploited through quasi-orthogonal space-time block codes (QOSTBC), we examine the influence of the remaining timing offset on the performance of the system, after coarse timing acquisition has been carried out at the receiver. Specifically, by utilizing the statistical properties of the channel paths and simulating the time error as a uniformly distributed random variable, we show that the average trace of the diversity gain matrix (DGM) undergoes a decrease with respect to the ideal case of zero intersymbol interference (ISI).

关键词： space-time block coding quasi-orthogonal designs time error detector wireless communications

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FPGA implementation of a GLST-MIMO system

FPGA implementation of a GLST-MIMO system

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9th International Conference on Advanced Communication Technology (ICACT 2007)

作者： Higashi, Kota Nagao, Yuhei Kurosaki, Masayuki Ochi, Hiroshi Kyushu Inst Technol Dept Comp Sci & Elect Engn Kawazu 680-4 Iizuka Fukuoka 8208502 Japan

ISBN: (纸本)9788955191318

This paper presents an FPGA implementation of a GLST-MIMO detector for GLST-MIMO wireless communication systems. The proposed system provides a maximum of 600 Mbps using the 80 MHz baseband bandwidth of the 4x2 MIMO scheme. The GLST-MIMO detector adopts a detection algorithm to low-computational complexity, as low as O(M-Tx (2)) = O(4(2)) (M-Tx : number of transmit antennas) per symbol interval, by using the orthogonality of the channel matrix. The GLST-MIMO detector architecture meets the timing constraints of real-time processing.

关键词： group layered space-time-MIMO system layered space-time space-time block coding FPGA implementation

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Dynamic subcarrier and power allocation with proportional rate constraints for multi-user space-time block-coded OFDM system

Dynamic subcarrier and power allocation with proportional ra...

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65th IEEE Vehicular Technology Conference

作者： Xu, Jian Paik, Wonkyu Kim, Jongkyung Sco, Jong-Soo Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea

ISBN: (纸本)9781424402656

This paper investigates the subcarrier and power allocation problem of multi-user space-time block coded OFDM systems with each subcarrier shared by two users. The objective is to maximize the total system capacity subject to the power and proportional rate constraints of each user. A low-complexity suboptimal algorithm that separates subcarrier allocation and power allocation is proposed. Simulation results show that the proposed resource allocation algorithm for space-time block coded OFDM can improve the capacity significantly with the same BER performance compared with static FDMA fixed allocation algorithm and the MIMO-OFDMA scheme in which each subcarrier is used only by one user. Furthermore, the more important point is that it can make the capacity be distributed more fairly, very close to the ideal rate constraints, among users than the scheme which maximizes the system capacity only(1).

关键词： space-time block coding OFDM resource allocation fairness

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BER performance analysis of space-time detection over correlated block fading channel

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Nanjing Youdian Daxue Xuebao (Ziran Kexue Ban)/Journal of Nanjing University of Posts and Telecommunications (Natural Science) 2007年第5期27卷 60-67页

作者： Zou, Yu-Long Zheng, Bao-Yu Zhao, Xian-Jing Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper presents the theoretical derivation and system simulation of the bit error rate (BER) performance of MPSK-based coherent space-time detection and differential space-time detection over the correlated block fading channel. It provides the closed form expressions of BER for the proposed schemes. Coherent detection can obtain good BER performance, but requires reliable amplitude and phase of channel fading through the precise channel estimation. Differential detection, however, requires no channel state information, so it becomes more practical when the channel is fast-fading or the number of transmit antenna is large. Although differential detection is robust, its BER performance is inferior compared to coherent detection and has irreducible error floor in the high SNR region. Numerical results have shown that both coherent detection and differential detection get distinct diversity gain and performance of coherent detection is better than that of differential detection under the condition of the same constellation and SNR, which coincides with the theoretical results well.

关键词： Coherent space-time detection Correlated blocking fading channel Differential space-time detection Error floor space-time block coding

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