A novel low‐complexity transmission power adaptation in MC‐CDMA systems with a‐MRC receiver over Nakagami‐m fading channels
A novel low‐complexity transmission power adaptation in MC‐CDMA systems with a‐MRC receiver over Nakagami‐m fading channels
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DOI：
10.1002/dac.970
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发表时间：
2009-02
影响因子：
2.1
通讯作者：
Yizhi Feng;J. Qin;G. Wei;Fei Ji
中科院分区：
文献类型：
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作者：
Yizhi Feng;J. Qin;G. Wei;Fei Ji
针对Nakagami-m衰落信道下的多载波码分多址（MC-CDMA）系统，提出了一种新的低复杂度的传输功率自适应算法，该算法具有良好的误比特率（BER）性能。我们首先提出了一种新的接收机，称为第n阶最大比合并（a-MRC）接收机，其中第n个子载波的接收机功率增益是相应信道增益的第th（a-MRC 1）次幂。在简化了a-MRC接收机的基础上，我们提出了一种新的发射功率自适应方案，其中根据子信道增益在所有N个子载波上分配发射功率，并且发射机自适应其功率以在接收机处保持恒定的信干噪比（SINR）。该方案在独立和相关衰落信道上都比非自适应传输方案有显著的性能增益。此外，该方案保持了良好的BER性能，而它是比以前的功率控制/自适应方案简单得多。版权所有© 2008约翰威利父子有限公司。
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 ath‐order‐maximal‐ratio‐combining (a‐MRC) receiver with which the receiver power gain for the nth subcarrier is the ath (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.