Abstract
In this paper, a 4x4 multiple-input multiple-outputorthogonal frequency division multiple access (MIMO-OFDMA) downlink transceiver based on IEEE 802.16e-2005 standard is proposed. Under high mobility environment, wireless channel is effected by Doppler Effect critically. A low complexity Channel-estimator is proposed in this thesis for detecting the channel information which change rapidly in high mobility environment and a simplified pipelined SFBC decoder is also proposed to demodulate the received signal. Moreover, an ICI-compensation system is proposed to mitigate the Doppler Effect and provide an extra gain of 2.5 dB for the system in certain condition. When the mobility reach 300 km/hr, the BER can still hold on about 10□3 for QPSK in the proposed system. Physical design will focus on the operation of frequency domain in the system. Some part of the system will be ignored to pursue a low power and low cost chip design. The maximum operating frequency is 62.5 MHz and the area is 356 (K) in gate-count for the proposed design. The maximum throughput of the proposed design is 51.3 Mbps for each user in the system under 16-QAM modulation operation.