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Design And Implementation Of Multi-rate Modem
- Apr 14, 2017 -

Multiple information rates coexist in modern communication systems, and multi-rate compatibility becomes a prominent problem. Based on direct sequence spread spectrum (DS-SS) and convolution coding, a method of realizing the multi-rate compatible modem is proposed, and the different information speeds occupy the same transmission bandwidth by selecting pseudo-random sequences of different lengths or convolution coding. In this paper, the coding and decoding part of the spread spectrum, the expansion and convolutional code are discussed in detail, the principle and realization method of the key module are given, the communication system using this modem is tested and the test data is given.