Title: Maximum likelihood detection with arbitrary modulations in cooperative relay channels

Authors: Azlan Abd Aziz; Yasunori Iwanami

Addresses: Department of Computer Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan ' Department of Computer Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Abstract: This paper proposes a simple combining technique with arbitrary modulations for a cooperative relay scheme based on a detect-and-forward relay protocol. Here we present maximum likelihood criterion detection at the destination which considers individual symbol error rate to facilitate the detection in noisy relay networks. In particular, our proposed algorithm is flexible to signals with different modulation formats as detection is done on a symbol-by-symbol basis. If different modulations are used at the source and the relays, we propose that lower modulation constellation is used at the source. By computer simulations, the results show that significant packet error rate performance can be achieved by the proposed scheme and we compare it against cooperative-maximum ratio combining and selection combining.

Keywords: cooperative relay channels; detect-and-forward relay protocol; maximum-likelihood criterion detection; arbitrary modulation.

DOI: 10.1504/IJWMC.2011.044103

International Journal of Wireless and Mobile Computing, 2011 Vol.5 No.1, pp.24 - 31

Available online: 09 Dec 2011 *

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