A novel low‐complexity transmission power adaptation in MC‐CDMA systems witha‐MRC receiver over Nakagami‐mfading channels
Yizhi Feng, Jiayin Qin, Gang Wei, Fei Ji · International Journal of Communication Systems · 2008
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‐mfading channels. We first propose a new receiver calledath‐order‐maximal‐ratio‐combining (a‐MRC) receiver with which the receiver power gain for thenth subcarrier is theath (a⩾1) power of the corresponding channel gain. Incorporating thea‐MRC receiver, we then propose a new transmission power adaptation scheme where the transmission power is allocated over all theNsubcarriers 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.