| With the development of Information Industry, wireless technology is now becoming one of the hotspots in communication markets. The WiMAX system which supports IEEE802.16e standard holds the traits of Mobility, Broadband and IP-based Architecture, so that WiMAX is a kind of promising Broadband Wireless Access technology.In this thesis, firstly the IEEE802.16e physical layer standard, channel estimation principles and Multiple Input Multiple Output technology are introduced, the MIMO-OFDMA uplink of the 802.16e and modeling methods of the wireless channel are also theoretically analyzed. Then channel estimation algorithms based on Multi-antenna pilot pattern in uplink partial usage of subchannels (UL-PUSC) zone are theoretically researched, LS and LMMSE algorithms which are used to estimate channels of pilot subcarrier positions are studied, interpolation algorithms and polynomial fitting algorithms which are used to estimate channels of data subcarrier positions are also researched. The simulation model of Multi-antenna uplink is established with MATLAB, and all the float-point simulation results of channel estimation in ITU-RM.1225 channel model are given. These methods are compared in terms of complexity, mean square error and bit error rate performances, and results show that LS and interpolation in Frequency-domain algorithms are the best schemes for the Multi-antenna pilot pattern of UL-PUSC zone. At the same time, various space-time decoding algorithms in uplink are also investigated and float-point simulations are completed. According to float-point simulations, fixed-point simulations of channel estimation algorithms and space-time decoding algorithms are made in order to determine the optimal parameter for FPGA implementation. Finally, the channel estimation and space-time decoding module are implemented on the FPGA, and simulation results and hardware resources consumed are analyzed to confirm the correctness of the module. |
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