Research On Key Techniques Of M-ary Spread Spectrum System

This paper deals with some key techniques of M-ary spread spectrum systems. A design scheme for M-ary spread spectrum system (1024,10) is proposed , including coding scheme, spread spectrum scheme , synchronizing scheme and despreading scheme. During the design of the system, a special aim is how to reduce the scale and raise the speed of the system because the scale of (1024,10) is very large. A special structure of coherent receiver is proposed which combine the advantages of the parallel and serial structure. The design of M-ary spread spectrum system is proved in the system of (32,5) which is small in scale. In addition, Bit error rate (BER) performance of the M-ary orthogonal spread spectrum system based on I bit quantization is analyzed in this paper and the formula of BER is obtained. By comparing it with other several systems, some concerned conclusions about this kind of system are gained.