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Amplify-and-forward multihop relaying with adaptive M-QAM in Nakagami-m fading
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Beaulieu, N. C., Farhadi, G. and Chen, Yunfei (2011) Amplify-and-forward multihop relaying with adaptive M-QAM in Nakagami-m fading. In: 54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011, Houston, TX, 5-9 Dec 2011. Published in: GLOBECOM - IEEE Global Telecommunications Conference pp. 1-6. ISBN 9781424492688. doi:10.1109/GLOCOM.2011.6134065
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Official URL: http://dx.doi.org/10.1109/GLOCOM.2011.6134065
Abstract
An amplify-and-forward (AF) multihop relaying system employing constant-power rate-adaptive M-QAM transmission is investigated. Accurate expressions for performance evaluation in Nakagami-m fading of adaptive continuous rate (ACR) and adaptive discrete rate (ADR) M-QAM are obtained. The analysis is based on a new approximation for the instantaneous end-to-end received SNR in the form of a scaled version of the harmonic mean of the individual per-hop SNRs. The scaling factor is determined based on the average link SNRs. Performance results evaluated using the proposed approximation are more accurate than the performance bounds obtained using the conventional harmonic- mean-based upper bound on the instantaneous received SNR, even though they are obtained with the same computational complexity. Numerical results show that the approximate performance results are very close to the exact results especially in small SNR regimes and for larger values of the Nakagami parameter. It is shown that the ACR QAM achieves an average spectral efficiency within a certain distance of the Shannon limit. The ADR QAM achieves smaller bit error rates than the target bit error rate but at the expense of an additional penalty on the average spectral efficiency, especially for smaller numbers of region boundaries. © 2011 IEEE.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | GLOBECOM - IEEE Global Telecommunications Conference | ||||
| ISBN: | 9781424492688 | ||||
| Book Title: | 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Page Range: | pp. 1-6 | ||||
| DOI: | 10.1109/GLOCOM.2011.6134065 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011 | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Houston, TX | ||||
| Date(s) of Event: | 5-9 Dec 2011 |
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