COFDM信号峰平比改善及系统实现

PAPR reduction for COFDM with Golay coding scheme and system implementation

依据互补编码法降低峰平比原理,研究了互补编码法算法.根据算法复杂性和实现可行性间的平衡度,提出一种新的编解码方法并给出详细的解码步骤;通过对陪集进行透明性选择,省掉了对冗余陪集的解调,降低了算法复杂度,提高了可实施性.在40 MHz中频和高斯白噪声信道下对该算法进行了性能仿真,结果表明其峰平比可有效限制在6 dB以内,且其误码性能有较大的改善.并在32子载波的实际OFDM系统下予以实现,实际结果和理论分析非常吻合.

According to complementary sequence characteristics, we study the algorithm for PAPR reduction in OFDM systems with Golay complementary sequences which are constructed by the Reed-Muller codes. In terms of the balance between complexity and implementation, we propose a new decoding scheme, which makes selection in the cosets so as to reduce the complexity of decoding and satisfy the real- time requirement. Finally, the simulation results in the AWGN channels show that the proposed algorithrn can constrain PAPR within 6 dB and achieves satisfactory BER performance.