A novel low-complexity transmission power adaptation in MC-CDMA systems with a-MRC receiver over Nakagami-m fading channels
✍ Scribed by Yizhi Feng; Jiayin Qin; Gang Wei; Fei Ji
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 262 KB
- Volume
- 22
- Category
- Article
- ISSN
- 1074-5351
- DOI
- 10.1002/dac.970
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✦ Synopsis
Abstract
In this paper, we propose a novel low‐complexity transmission power adaptation with good bit error rate (BER) performance for multicarrier code‐division multiple‐access (MC‐CDMA) systems over Nakagami‐m fading channels. We first propose a new receiver called __a__th‐order‐maximal‐ratio‐combining (a‐MRC) receiver with which the receiver power gain for the __n__th subcarrier is the __a__th (a⩾1) power of the corresponding channel gain. Incorporating the a‐MRC receiver, we then propose a new transmission power adaptation scheme where the transmission power is allocated over all the N subcarriers according to the subchannel gains and the transmitter adapts its power to maintain a constant signal‐to‐interference‐plus‐noise (SINR) at the receiver. The proposed scheme has a significant performance gain over the nonadaptive transmission scheme over both independent and correlated fading channels. Moreover, the proposed scheme keeps good BER performance while it is much simpler than the previous power control/adaptation schemes. Copyright © 2008 John Wiley & Sons, Ltd.