通过对变换域通信系统的基函数生成算法的研究,在传统的使用一维伪随机(PN)序列对相位进行随机化方法的基础上,提出了一种新的基于随机幅度谱编码的算法用于基函数生成:用另一个一维PN序列与基函数的幅度谱向量进行点乘,对其随机化处理,该方法生成的基函数较传统的一维PN序列方法产生的基函数的随机性提高Ⅳ(Ⅳ为基函数长度)倍,大大增强了系统的抗截获能力和多址容量;最后对系统的误码率进行了仿真,验证了该方法可以提高多址通信时的系统性能。
The fundamental and basis function generation algorithm of transform domain communication system (TDCS) are analyzed firstly. On the basis of one-ary PN sequence phase randomization, the basis function generation algorithm based on amplitude spectrum coding is studied by using another one-ary PN sequence multiplied by the amplitude spectrum of basis function. The randomicity of this method is N( N is the length of basis function) times by that of traditional method ,which will increase the ability of anti-in- tercepting and capacity of multiple access. The simulation results show that performance on multiple access communication BER(Bit Error Ratio) is better.