低实现复杂度的改善OFDM系统PAPR性能的SLM改进算法  

Improved SLM algorithm to improve the PAPR performance of OFDM system with low implementation complexity

作　　者：蒋阳[1] 罗杨[1] 罗艳[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2011年第8期109-113,共5页Journal of Chongqing University

基　　金：'211工程'三期建设资助项目(S-09102)

摘　　要：为了兼顾实际应用实现的可行性与降低OFDM系统的复杂度,提出了一种SLM的改进算法。首先该算法把原始数据分段后进行组内扰码,打破原始数据序列的自相关性,降低了所有子载波间的相位一致性,从而减低了OFDM系统的PAPR;其次利用傅立叶变换所具有的线性性质,对已获得的IFFT的数据序列进行线性组合得到新的扰码序列,从而严格控制IFFT个数,同时得到更多的时域备选数据序列,进一步降低了系统的PAPR,同时也大大减少了系统的计算复杂度。理论分析与仿真结果表明,改进的SLM算法不仅能有效抑制PAPR,同时可减小算法计算的复杂度与系统实现的复杂度。In order to consider the feasibility of practical implementation and reduce the complexity of OFDM systems,an improved SLM algorithm is proposed.The original data are segmented and scrambled,which breaks the correlation of the original data sequences,and reduces all sub-carrier phase coherence,thereby reducing the OFDM system PAPR.Following the linear nature of the Fourier transform,the obtained IFFT data sequences are linearly combined to get the new scrambling code sequences,such that strictly controlling the IFFT number,while getting more data sequences,which further reduces the system PAPR,and significantly reduces the computational complexity of the system.Theoretical analysis and simulation results show that the improved SLM algorithm can effectively suppress PAPR,while reducing the algorithm complexity and system complexity.

关 键 词：正交频分复用 峰均功率比 分段式虚拟序列插入 线性组合 

分 类 号：TN301.6[电子电信—物理电子学]