摘要
OFDMA系统的峰均功率比(PAPR)的抑制技术具有很大的工程实用价值。传统的降低OFDMA系统中峰均功率比的编码方法存在只适用于子载波数较小系统的问题,限制了其实用性。为了解决这一问题,借鉴采用部分传输序列(PTS)降低中峰均功率比的方法,将输入的数据符号等分成若干组,分别对每一分组进行编码,然后再通过辅助信息来合并这些分组,由此提出了一种适用于OFDMA系统降低峰均功率比的改进型的方法编码-PTS方法。同时,分析了利用迭代方法寻找次优辅助信息的方法,利用该方法能够降低系统的复杂度。仿真结果表明编码-PTS方法能够改善OFDMA系统的峰均功率比性能。
The technology of reducing PAPR in OFDMA systems has great engineering value.The traditional PAPR reduction encoding algorithm for OFDMA system is only applicable to systems with small number of subcarriers,which limits its practical use.To solve this problem,by referencing to the principle of traditional Partial Transmit Sequence（PTS） algorithm,an encoding-PTS algorithm which is suitable for the OFDMA systems is proposed.With the proposed algorithm,the input data symbols are divided into several groups,each group of symbols is encoded,and the groups are combined by side information.The proposed algorithm is called encoding-PTS algorithm.We also discuss a method to find sub-optimal side information,which can reduce system complexity.Simulation results show that the PAPR performance of OFDMA system is improved with the proposed encoding-PTS algorithm.
出处
《电路与系统学报》
北大核心
2013年第2期236-241,共6页
Journal of Circuits and Systems
基金
国家"十二五"科技支撑计划资助项目(2013BAK06B03)
国家自然科学基金面上资助项目(51274018)
东南大学移动通信国家重点实验室开放基金(2010D11)
