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368861 |
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|a Yang, Yanping
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|a Chen, Wei
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|a Li, Qu
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|a Hanzo, Lajos
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|a Variable-rate, variable-power network-coded-QAM/PSK for bi-directional relaying over fading channels
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|c 2014-10.
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|z Get fulltext
|u https://eprints.soton.ac.uk/368861/1/tcomm-hanzo-2354353-proof.pdf
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|a Network coded modulation (NCM) holds the promise of significantly improving the efficiency of two-way wireless relaying. In this contribution, we propose near instantaneously adaptive variable-rate, variable-power QAM/PSK for NC-aided decode-and-forward two-way relaying (DF-TWR) to maximize the average throughput. The proposed scheme is optimized subject to both average-power and bit-error-ratio (BER) constraints. Based on the BER bounds, we investigate a discrete-rate adaptation scheme, relying on a pair of solutions proposed for maximizing the spectral efficiency of the network. We then derive a closed-form solution based power adaptation policy for a continuous-rate scheme and quantify the signal-to-noise ratio (SNR) loss imposed by NC-QAM. Our simulation results demonstrate that the proposed discrete adaptive NC-QAM/PSK schemes are capable of attaining a higher spectral efficiency than their fixed-power counterparts.
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