A PAPR Reduction Method for CPM-OFDM Systems using Initial Phase Randomization
A PAPR Reduction Method for CPM-OFDM Systems using Initial Phase Randomization
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DOI：
10.1541/ieejeiss.134.1010
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发表时间：
2014
影响因子：
--
通讯作者：
K. Morioka;D. Asano
中科院分区：
文献类型：
--
作者：
K. Morioka;D. Asano
本文研究了将连续相位调制(CPM)作为正交频分复用(OFDM)的第一调制方案的CPM-OFDM系统。与传统的ofdm系统一样，降低峰值平均功率比(PAPR)是CPM-ofdm系统的首要任务。提出了通过改变具有固定偏移量和随机偏移量的每个子载波的初始相位来降低PAPR。在随机偏移方法中，每个子载波的初始相位在接收端是未知的，因此我们提出了一种利用CPM和MLSD(最大似然序列检测)的相位连续性的解调算法。仿真结果表明，采用随机偏移方法可以提高系统的PAPR性能。此外，我们还发现，即使在接收端初始相位未知的情况下，所提出的算法也可以解调CPM-ofdm符号以及在初始相位已知的情况下的算法。
In this paper, CPM-OFDM systems which use CPM (Continuous Phase Modulation) as the first modulation scheme of OFDM (Orthogonal Frequency Division Multiplexing) are considered. As is the case for conventional OFDM systems, PAPR (Peak to Average Power Ratio) reduction is the most important task in CPM-OFDM systems. PAPR reduction by varying the initial phase of each sub-carrier with a fixed offset and a random offset are proposed. In the random offset method, the initial phase of each sub-carrier is not known at the receiver side, so we propose a demodulation algorithm using the phase continuity property of CPM and MLSD (Maximum Likelihood Sequence Detection). Simulation results show that the PAPR performance is improved if we use the random offset method. Also, we found that even though the initial phase is unknown at the receiver, the proposed algorithm can demodulate CPM-OFDM symbols as well as an algorithm where the initial phase is known.