| Summary: | 碩士 === 國立交通大學 === 電機學院通訊與網路科技產業專班 === 98 === In MIMO-OFDM systems there are two methods,which can offer high data rates through spatial multiplexing or transmit diversity using spatial diversity.In this thesis,the systems are based on the IEEE 802.16e specifications,we observe the change of the performance using Alamouti’s space-time codes(STC) and spatial multiplexing scheme in the high vehicle speed channel.And for the space-time block code,the orthogonal properties is destroyed in the time-varying channel,so we propose two algorithms,which are Parallel Interference Cancellation(PIC) and Ordered Successive Interference Cancellation(OSIC),to improve the bit-error rate from the inter-antennas interference(IAI).
In the 2x2 systems,in the same spectral efficiency(e.g. the space-time block code technique with a modulation scheme transmitting 2 bits per symbol has the same spectral efficiency as the spatial multiplexing scheme with a modulation transmitting bits per symbol.),we use computer simulation to compare the bit error rate performance between the spatial multiplexing(e.g.ML,ZF,MMSE,V-BLAST) and spatial diversity(e.g.STBC, STBC-PIC, STBC-OSIC).
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