摘要： 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 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。
关键词:
正交频分复用,
峰值平均功率比,
多相正交矩阵,
预编码,
部分传输序列
Abstract: 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 low-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 , 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.
Key words:
Orthogonal Frequency Division Multiplexing(OFDM),
Peak to Average Power Ratio(PAPR),
multi-phase orthogonal matrix,
pre-coding,
Partial Transmit Sequence(PTS)
中图分类号:
董建娥, 高宝建, 杜敏. 一种保证数据安全的低峰平比OFDM算法[J]. 计算机工程, 2011, 37(2): 286-289.
DONG Jian-E, GAO Bao-Jian, DU Min. Low-PAPR OFDM Algorithm to Guarantee Data Security[J]. Computer Engineering, 2011, 37(2): 286-289.