Diversity-multiplexing tradeoff analysis of a cooperative network coding system
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Iterative receiver for multi-input multi-output (MIMO) two-way wireless relay systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Optimum training sequence design for multi-input multi-output (MIMO) two-way wireless relay networks
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Resource-efficient wireless relaying protocols
IEEE Wireless Communications
Channel estimation for two-way relay OFDM networks
EURASIP Journal on Wireless Communications and Networking - Special issue on physical-layer network coding for wireless cooperative networks
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In coded bi-directional cooperation, two nodes wish to exchange messages over a shared half-duplex channel with the help of a relay. In this paper, we derive performance bounds for this problem for each of three protocols. The first protocol is a two phase protocol where both users simultaneously transmit during the first phase and the relay alone transmits during the second. In this protocol, our bounds are tight. The second protocol considers sequential transmissions from the two users followed by a transmission from the relay while the third protocol is a hybrid of the first two protocols and has four phases. In the latter two protocols the inner and outer bounds are not identical, and differ in a manner similar to the inner and outer bounds of Cover's relay channel. Numerical evaluation shows that at least in some cases of interest our bounds do not differ significantly. Finally, in the Gaussian case with path loss, we derive achievable rates and compare the relative merits of each protocol in various regimes. Surprisingly, we find that in some cases, the achievable rate region of the four phase protocol sometimes contains points that are outside the outer bounds of the other protocols.