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
Differential modulation for decode-and-forward multiple relay systems
IEEE Transactions on Communications
Link-adaptive cooperative communications without channel state information
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
TwinsNet: a cooperative MIMO mobile sensor network
UIC'06 Proceedings of the Third international conference on Ubiquitous Intelligence and Computing
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This paper introduces a novel differential modulation scheme for a two-user cooperative diversity system which does not require channel state information at either the users or the destination. The performance of fixed decode-and-forward and selection relaying protocols is evaluated in both symmetric and asymmetric interuser-channel cases. The lower bound on the performance of the decode-and-forward protocol is given, while the exact bit-error probability of the selection relaying protocol is thoroughly derived. The decode-and-forward relaying protocol achieves a performance gain when the signal-to-noise ratios in the interuser channels are symmetric and sufficiently high. The selection relaying protocol shows a larger performance gain and does not exhibit an error floor like in the case of the decode-and-forward protocol. In addition, it is robust to the asymmetric interuser channels.