给出k=1,2,3,4的OFDM系统使用改进的次优化算法时的PAPR性能。仿真参数：子载波数为64，QPSK调制，r=3，V=4，P=4，取 ，分割方法为交织分割，仿真的OFDM符号数为1000个。-Gives k = 1,2,3,4 of the OFDM system uses an improved PAPR when the sub-optimal algorithm performance. Simulation parameters: number of subcarriers 64, QPSK modulation, r = 3, V = 4, P = 4, take, segmentation is intertwined segmentation, simulation OFDM symbol number 1000.