Differential modulation for bidirectional relaying with analog network coding

Authors:
Lingyang Song;Yonghui Li;Anpeng Huang;Bingli Jiao;Athanasios V. Vasilakos
Affiliations:
School of Electronics and Computer Science, Peking University, Beijing, China;University of Sydney, Sydney, NSW, Australia;School of Electronics and Computer Science, Peking University, Beijing, China;School of Electronics and Computer Science, Peking University, Beijing, China;Department of Computer and Telecommunications Engineering, University of Western Macedonia, Kozani, Greece
Venue:
IEEE Transactions on Signal Processing
Year:
2010

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Abstract

In this correspondence, we propose an analog network coding scheme with differential modulation (ANC-DM) using amplify-and-forward protocol for bidirectional relay networks when neither the source nodes nor the relay knows the channel state information (CSI). The performance of the proposed ANC-DM scheme is analyzed and a simple asymptotic bit error rate (BER) expression is derived. The analytical results are verified through simulations. It is shown that the BER performance of the proposed differential scheme is about 3 dB away from that of the coherent detection scheme. To improve the system performance, the optimum power allocation between the sources and the relay is determined based on the simplified BER. Simulation results indicate that the proposed differential scheme with optimum power allocation yields 1-2 dB performance improvement over an equal power allocation scheme.