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This paper considers soft-message forwarding in a 2-hop wireless network. Previous methods have only considered the source-relay channel quality but ignored the relay-destination channel quality, causing potential sub-optimality especially in a parallel-relay setting. This paper takes a centralized approach by accounting for all the individual channel-segments, and proposes a “Z-forward” strategy,...
This paper devises a novel group frequency-hopping (FH) scheme for OFDM modulated multiuser system, in order to optimize the resource reuse efficiency and resolve the performance degradation due to the deep fading in the same time. In the OFDM modulated multiuser system, the traditional FH schemes can work in a multipath fading environment and achieve a moderate bit-error-rate (BER). However, when...
Cooperative diversity is an emerging technique that enables single-antenna terminals to share their resources (bandwidth and power) and achieve transmit diversity in a distributed fashion. In this work, an adaptive decode-and-forward(DF) cooperative diversity system based on quadrature signaling is proposed. Then a tight closed-form approximate bit error rate(BER) expression is derived in terms of...
Cooperative diversity enables single-antenna terminals in a multi-user environment to share their antennas so as to form a virtual antenna array and achieve spatial diversity in a distributed fashion. To improve the bandwidth efficiency of classical scheme, a novel cooperative diversity scheme based on space-time coding is proposed in this work. With the selection decode-and-forward (SDF) relaying...
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