| Summary: | 碩士 === 國立中山大學 === 通訊工程研究所 === 103 === This thesis considers a half-duplex amplify-and-forward two-way relay network consisting of two single-antenna sources and two relays, each having two antennas. Both traditional quasi-orthogonal space-time block code (QOSTBC) and quasi-orthogonal space-frequency block code (QOSFBC) can be adopted in this system to obtain spatial, but not full, diversity gain. Additionally, the computational complexity of the receiver is extremely high. This thesis proposes a novel full-diversity and full-rate distributed QOSTBC/QOSFBC in a two-way two-antenna relay network. Following traditional QOSTBC/QOSFBC, a fixed phase rotation is performed on one of the two encoded signals at the second relay. Meanwhile, another encoded signal at the second relay is rotated by a given phase, which is generated from a known channel state information. Consequently, the proposed scheme offers two significant advantages. First, the proposed scheme can achieve both full diversity and full rate. Second, the computational complexity of the receiver is significantly reduced. Simulation results indicate that the bit-error-rate (BER) performance of the proposed distributed QOSTBC and QOSFBC is better than that of the traditional QOSTBC and QOSFBC because the former achieves full diversity.
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