Exact BER analysis of distributed Alamouti's code for cooperative diversity networks
IEEE Transactions on Communications
On the second order statistics of the multihop Rayleigh fading channel
IEEE Transactions on Communications
Pilot-symbol-assisted detection scheme for distributed orthogonal space-time block coding
IEEE Transactions on Wireless Communications
Impact of imperfect channel estimation on the performance of amplify-and-forward relaying
IEEE Transactions on Wireless Communications
Power allocation for cooperative systems with training-aided channel estimation
IEEE Transactions on Wireless Communications
Channel estimation and performance of mismatched decoding in wireless relay networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Non-coherent amplify-and-forward generalized likelihood ratio test receiver
IEEE Transactions on Wireless Communications
Relaying utilization metrics of diamond cooperative diversity systems
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
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Cooperative diversity is a transmission technique where multiple nodes in a network cooperate to form a virtual antenna array realizing the benefits of spatial diversity in a distributed fashion. The coherent scenario considered in most existing work on cooperative diversity assumes the availability of perfect channel state information at the relay and destination terminals and is highly unrealistic in practical applications. In this paper, we investigate non-coherent and mismatched-coherent receivers for a cooperative diversity scheme assuming both quasi-static and time-varying fading channels for the underlying cooperative links. Specifically, we consider a distributed space- time block coded (STBC) system in a single-relay scenario operating in the amplify-and-forward relaying mode. Exploiting the orthogonal structure of distributed STBC, we first derive a non-coherent decoding rule which can be implemented in practice by a Viterbi-type algorithm. Although this decoding rule has been derived assuming quasi-static channels,- its inherent channel tracking capability allows its deployment over time- varying channels with a promising performance as a sub-optimal solution. As a possible alternative to non-coherent detection, we investigate the performance of mismatched-coherent receiver (i.e., coherent detection with imperfect channel estimation) within the considered relay-assisted transmission scenario. We further compare the performance of non-coherent and mismatched- coherent receivers to reveal their robustness under various mobility scenarios.