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In this paper, the encoding/decoding scheme for the Cyclic Prefix (CP) based Time-Reversal Quasi-Orthogonal Space-Time Block Coded (TR-QOSTBC) wireless communication systems over frequency-selective fading channels is studied. A CP based 4 ? 1 TR-QOSTBC system is studied in detail, and the upper bound of the Pair-wise Error Probability (PEP) is derived. The authors' analysis shows that the proposed scheme can successfully exploit the multipath diversity embedded in frequency-selective fading channels. For Time-Reversal Rotated QOSTBC (TR-ROSTBC) system, both the multipath diversity and the full spatial diversity can be achieved. With a decoupled structure, the frequency domain optimal Maximum Likelihood (ML) solution and the low-complexity sub-optimal solution in a pair-wise sense are proposed. Simulation results verify their analysis and the effectiveness of the proposed solutions.
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