The Scheme Design and Implementation of the Baseband Part of a Wireless OFDM System

OFDM is the key technique in the next generation communication. In this paper, the design and implementation scheme of the baseband part of multimedia communication system carried by automobile is described. It is developed with the COFDM technique and MPEG-4 standard. The baseband system is mainly composed of two boards-source and channel encoders/decoders, which include some sub-blocks for different functions. The equipment designed can transmit audio/video signals at a wireless mobile channel for some special users exclusively. Based on the theory of software defined radio and the idea of modular function design, it is implemented by the universal high performance chips-DSP, FPGA and EPLD. It supplies a convenient user interface and the software embedded in the chips can be programmed to different functions. So it is easy to debug and modify for designers with a much lower cost