Full-rate distributed space-time coding for bi-directional cooperative communications

Authors:
Hoc Phan;Trung Q. Duong;Hans-Jürgen Zepernick
Affiliations:
Blekinge Institute of Technology, Ronneby, Sweden;Blekinge Institute of Technology, Ronneby, Sweden;Blekinge Institute of Technology, Ronneby, Sweden
Venue:
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
Year:
2010

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Abstract

In this paper, a protocol for bi-directional cooperative communications applying full-rate distributed space-time codes and physical network coding is proposed. This scheme uses L relays to transmit the codewords in a distributed fashion. It takes 3 time slots for two sources to transmit two corresponding codewords by exploiting physical network coding and self-interference cancelation at each source. We prove that this scheme obtains full diversity. The analytical results show that the diversity order of this scheme will be L + 1, where L is the number of relays. In addition, we assess the sum-rate of the bi-directional cooperative communication scheme and reveal that it achieves larger spectral efficiency compared to one-way cooperative communication scheme. We employ Monte Carlo simulations to validate the symbol error rate and the ergodic sum-rate of the scheme.