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- W2346881113 abstract "Recently, there have been several proposals to combine space-time block coding (STBC) and spatial multiplexing (SM) to obtain both spatial diversity gain and spatial multiplexing gain simultaneously in a MIMO system [1], [2]. While merit of the combination is straightforwardly realized, the challenge lies in the detection method to cancel interference at the receiver. In [2] Zhao and Dubey proposed a group detection scheme, in which group detection is carried out to separate transmitted block codes, followed by the Alamouti’s algorithm to decode the transmitted symbols encoded within each group. The scheme can be implemented with low complexity and relatively good bit error rate (BER) performance. However, it suffers a low limit N <= M, where N and M are the number of transmit (Tx) and receive (Rx) antennas, respectively. This means that the maximum achievable multiplexing gain is limited to M/2. Another problem is that when zero-forcing (ZF) method is used to separate transmitted groups, matrix inversion of the channel matrix is not easily generalized for a system with large antennas. In the recent research, we have proposed a minimum mean square error (MMSE) detection scheme for multiuser STBC systems [3], [4]. Different from the group detection scheme, our scheme uses a simple processing scheme which allows combination of interference cancellation (IC) and space-time decoding in a symbol detection manner. As a multiuser STBC system and the combined STBC-SM system are equivalent, we can apply our symbol detection scheme for multiuser STBC systems to the case of the combined STBC-SM system. We first extend the MMSE symbol detector in [3], [4] to the case of ZF and combined QR decomposition and successive interference cancellation (QR-SIC). Then we perform detailed computational complexity analysis for both the group and symbol detection schemes using ZF, MMSE and QR-SIC method. We show that our scheme allows to extend the limit on the number of Tx antennas from N <= M to N <= 2M, and thus double the multiplexing gain. It is shown that all ZF, MMSE, and QR-SIC symbol detectors outperform their corresponding group detectors in terms of BER performance. In terms of complexity, while the ZF and QR-SIC symbol detectors require about 2 and 1.5 times larger complexity than their corresponding group detectors, the MMSE symbol detector allows to save up more than six times compared with the MMSE group detector." @default.
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- W2346881113 date "2007-01-01" @default.
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- W2346881113 title "Performance of Detectors for Combined STBC-SM Systems" @default.
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