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Adaptive Selection of Surviving Symbol Replica Candidates for QuasiMaximum Likelihood Detection Using MAlgorithm with QRDecomposition for OFDM MIMO Multiplexing
Kenichi HIGUCHI Hiroyuki KAWAI Hidekazu TAOKA Noriyuki MAEDA Mamoru SAWAHASHI
Publication
IEICE TRANSACTIONS on Communications
Vol.E92B
No.4
pp.12581271 Publication Date: 2009/04/01 Online ISSN: 17451345
DOI: 10.1587/transcom.E92.B.1258 Print ISSN: 09168516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: OFDM, MIMO, spatial multiplexing, maximum likelihood detection, Malgorithm,
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Summary:
This paper proposes an adaptive selection algorithm for the surviving symbol replica candidates (ASESS) based on the maximum reliability in maximum likelihood detection with QR decomposition and the Malgorithm (QRMMLD) for Orthogonal Frequency Division Multiplexing (OFDM) multipleinput multipleoutput (MIMO) multiplexing. In the proposed algorithm, symbol replica candidates newlyadded at each stage are ranked for each surviving symbol replica from the previous stage using multiple quadrant detection. Then, branch metrics are calculated only for the minimum number of symbol replica candidates with a high level of reliability using an iterative loop based on symbol ranking results. Computer simulation results show that the computational complexity of the QRMMLD employing the proposed ASESS algorithm is reduced to approximately 1/4 and 1/1200 compared to that of the original QRMMLD and that of the conventional MLD with squared Euclidian distance calculations for all symbol replica candidates, respectively, assuming the identical achievable average packet error rate (PER) performance in 4by4 MIMO multiplexing with 16QAM data modulation. The results also show that 1Gbps throughput is achieved at the average received signal energy per bittonoise power spectrum density ratio (E_{b}/N_{0}) per receiver antenna of approximately 9 dB using the ASESS algorithm in QRMMLD associated with 16QAM modulation and Turbo coding with the coding rate of 8/9 assuming a 100MHz bandwidth for a 12path Rayleigh fading channel (root mean square (r.m.s.) delay spread of 0.26 µs and maximum Doppler frequency of 20 Hz).

