一种保证数据安全的低峰平比OFDM算法

摘要

In order to overcome the high Peak to Average Power Ratio(PAPR) of Orthogonal Frequency Division Multiplexing(OFDM) signal, a construction method of multi-phase orthogonal matrix family is proposed and its nature is analyzed, two kinds of Iow-PAPR and data security guaranteed algorithms of OFDM are designed by using multi-phase orthogonal matrix. Theoretical analysis and simulation results show that the matrix number of orthogonal matrix family is N × NN , and the PAPR can be reduced without introducing error rate, the data security is guaranteed through taking any matrix as a key and multiplying the OFDM input signals. In addition, the PAPR of system can be well improved by combining this pre-coding method with Partial Transmit Sequence(PTS) technology.%为克服正交频分复用(OFDM)信号峰平比较高的问题,给出多相正交矩阵族的构造方法,分析矩阵族的性质,并利用多相正交矩阵设计2种可保证数据安全的低峰值平均功率比OFDM算法.理论分析和仿真实验表明,多相矩阵族中的正交矩阵数量达N×N N个,将其中任意一个矩阵作为密钥,且与OFDM输入信号相乘,能在不引入误码的情况下降低OFDM信号的峰值平均功率比值,同时可保证基带数据的安全性.将该预编码方法与部分传输序列算法结合,能很好地改善系统的峰平比.