摘要
传统多进制扩频调制使用多个相关器进行检测,每个相关器产生一个相关值,实现复杂。提出了一种使用FIR滤波器的基于扩频码段分路和延时相加的实用多进制扩频检测方法,通过FIR滤波即可产生所有相关值,实现结构简单,特别适合在使用周期移位伪随机序列的联合战术信息分发系统(JTIDS)中应用,可有效降低JTIDS系统中多进制扩频信号的检测复杂度和工程实现难度。仿真比较了优选扩频序列和Walsh正交码集的误比特率性能,获得了良好的性能结果。
The conventional detection method of M-ary spread modulation uses Multiple correlators to complete the data detection, and each correlator produces a single correlation value. This architecture has a high implementation complexity. In this paper, a low-complexity detection method for M-ary spread modulation is proposed based on splitting up the spread signal segment into two branch and filter them using two FIR filter. In contrast to the conventional method, by delaying and adding the filtered data segment from only two FIR filter output, all correlation values can be got. This simple detection architecture reduces the implementation complexity and is applicable to the US Joint Tactical Information Distribution System （JTIDS） which uses only one periodic shifted spread code. BER performances of single-code systems and Walsh system are simulated. Simulation results prove well performances.
出处
《无线电通信技术》
2013年第3期24-27,共4页
Radio Communications Technology
