摘要
现代通信系统中多种信息速率并存,多速率兼容成为一个突出的问题。基于直接序列扩频(DS-SS)和卷积编码技术,提出了一种可以满足多速率兼容的调制解调器实现方法,通过选择不同长度的伪随机序列或者卷积编码,不同的信息速率占用相同的传输带宽。对扩频、解扩以及卷积码的编码和解码部分进行了较为详细的论述,给出了关键模块的原理和实现方法,对使用此调制解调器的通信系统进行了测试,并给出了测试数据。
Modern communication system usually contains several data rates, thus the implementation of multi-rate modem becomes an important research topic. Based on the techniques of direct-sequence spread spectrum （DSSS） and eonvolutional code,a multi-rate modem implementation method is proposed ,which can use the same bandwidth with different data rates by choosing the different length PN or convolutional code. The spread frequency,de-spread frequency and convolutional coder and decoder are discussed in detail,and the principle and design of kernel modules are introduced. The communication system which adopts the modem is tested, and the results are presented.
出处
《无线电通信技术》
2013年第6期90-93,共4页
Radio Communications Technology
