Performance Analysis of Relay Networks with Channel code in Low SNR Regime

Abstract : This paper analyzes the performance of relay networks with channel coding in low and medium Signal-to-Noise Ratio (SNR) regime. In particular, we study the three-node relay network in the quasi-static block Rayleigh fading channel plus additive white Gaussian noise. Estimate-and-forward (EF) relay protocol is used. In order to achieve high spectrum efficiency, the relay can either forward the whole or a part of the estimated codeword to the destination. The contributions of the paper are as follows: i) First, we compute an upper bound of the Bit Error Rate (BER) of the proposed scheme. ii) Second, from the upper bound, we derive a so-called instantaneous diversity order in low and medium SNR region which is essential to practical systems. The instantaneous diversity depends on both the amount of information forwarded by the relay and the minimum distance of the channel code. Interestingly, the proposed scheme can achieve full diversity gain in a given SNR region of interest (such as BER ≤ 10-5) while obtaining 32% spectrum efficiency improvement compared to classical relay network under appropriate conditions. The analysis is checked by simulation.
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Contributor : Pierre Duhamel <>
Submitted on : Monday, April 22, 2013 - 4:53:57 PM
Last modification on : Monday, June 24, 2019 - 2:36:14 PM

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Xuan Thang Vu, Vo Nguyen Quoc Bao, Marco Di Renzo, Pierre Duhamel. Performance Analysis of Relay Networks with Channel code in Low SNR Regime. IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2013), Jun 2013, Darmstadt, Germany. pp.1-5, ⟨10.1109/spawc.2013.6612115 ⟩. ⟨hal-00816682⟩

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