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Outage Probability and Optimum Power Allocation for Analog Network Coding

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3 Author(s)
Zhihang Yi ; Dept. of Electr. & Comput. Eng., Queen''s Univ., Kingston, ON, Canada ; MinChul Ju ; Il-Min Kim

We study the analog network coding (ANC), which is a well-known amplify-and-forward (AF)-based bidirectional protocol, for a bidirectional network consisting of two different sources and a relay. In this protocol, the two sources exchange information with the help of the relay during two time slots in a half-duplex mode. For this system, we first derive a tight lower bound of outage probability, which is very close to the exact outage probability in the whole signal-to-noise ratio (SNR) range irrespective of the values of channel variances. Using the tight lower bound, we obtain finite-SNR diversity-multiplexing tradeoff of the ANC protocol. Furthermore, we propose an optimum power allocation scheme, which simultaneously minimizes the outage probability and maximizes the total mutual information of the ANC protocol.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:10 ,  Issue: 2 )

Date of Publication:

February 2011

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