Design Of An OFDM Transmitter For IEEE802.11a Standard Based On FPGA

Orthogonal Frequency Division Multiplexing (OFDM) has been widely regarded as an effective technique for increased spectral efficiency and for combating the detrimental effects of Inter-symbol interference (ISI) that inevitably occurs due to multipath propagation in wireless communication channels. OFDM has been applied to worldwide standards of WLAN and has been considered to be a promising technique for high data-rate wireless transmission in next-generation mobile communications. In this case, how to realize efficient OFDM system has been a very important issue.This thesis aims to explore the implementation of an OFDM baesband process targeted on its application in IEEE802.11a systems. A design and hardware implementation of the transmitter processor has been accomplished on Xilinx Sparten-3E field programmable gate array(FPGA) . The whole design is accompanied with the top-down strategy.The detailed design and simulation of the transmit functional models are as follows:(1) Training sequence generator module , including both long and short training sequence;(2) Signal symbol generator module , as well as convolutioner, interleaver, BPSK mapper;(3) Data symbol generator module,which contain scrambler, convolutioner, interleaver, BPSK/ QPSK/ 16QAM/ 64QAM mapper;(4) OFDM modulate module , including pilot insert module, cycle prefix added modlue and IFFT/FFT module;(5) Complete the joint-debug of transmitter module successfully;In addition, part of receiver modules have also been designed based on FPGA.