Differential modulation for two-user cooperative diversity systems

TitleDifferential modulation for two-user cooperative diversity systems
Publication TypeJournal Article
Year of Publication2005
AuthorsTarasak, P., H. Minn, and V. K. Bhargava
JournalSelected Areas in Communications, IEEE Journal on
Pagination1891 - 1900
Date Publishedsep.
Keywordsasymmetric interuser-channel, bit-error probability, block codes, channel coding, channel estimation, decode-and-forward protocol, decoding, differential detection, differential modulation, differential phase shift keying, diversity reception, error statistics, protocols, selection relaying protocol, space-time codes, symmetric interuser channel, two-user cooperative diversity system

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.


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