In this paper, space-timeblock codes (STBCs) are applied in a distributed fashion in a scenario with multiple cooperating relay stations (RSs) having multiple antennas. By applying the Chernoff bound to the theoretic...
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In this paper, space-timeblock codes (STBCs) are applied in a distributed fashion in a scenario with multiple cooperating relay stations (RSs) having multiple antennas. By applying the Chernoff bound to the theoretical bit error rate (BER) in Rayleigh fading channels, it turns out that the BER performance has a higher sensitivity to spatial correlation in Multiple Input Multiple Output channels than to different receive powers at the receiver from different cooperating RSs. If the number of overall available antennas exceeds the number of required antennas for the considered STBC, based on the theoretical analysis a criterion for the selection of the antennas which should cooperate in order to achieve the best BER performance is given.
In this paper, we investigate single carrier frequency-domain equalization (SC-FDE) for distributedspace-timeblock codes (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. W...
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ISBN:
(纸本)9781424402694;9781424402700
In this paper, we investigate single carrier frequency-domain equalization (SC-FDE) for distributedspace-timeblock codes (D-STBC) in a relay-assisted transmission scenario over frequency-selective fading channels. We assume the special case of a single-relay where the source-to-relay (S -> R), relay-to-destination (R -> D), and source-to-destination (S -> D) links experience possibly different channel delay spreads. Assuming perfect power control between R -> D and S -> D links and high signal-to-noise ratio for all underlying links, our performance analysis demonstrates that SC-FDE for D-STBC is able to achieve a maximum diversity order of min (L-1, L-3) + L-2 + 2 where L-1, L-2, and L-3 are the channel memory lengths for S -> R, S -> D, and R -> D links, respectively. This illustrates that the smaller of the multipath diversity orders experienced in S -> R and R -> D links becomes the performance bottleneck for the relaying path. For the special case of a non-fading relaying path where line-of-sight propagation is possible in either one of these underlying links, we demonstrate that the maximum diversity orders of L-1 + L-2 + 2 and L-3 + L-2 + 2 are achievable assuming non-fading R -> D and S -> R links, respectively. An extensive Monte Carlo simulation study is presented to corroborate the analytical results and to provide detailed performance comparisons among the competing schemes.
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