| As one of the most important technologies, MIMO-OFDM has attracted a lot of attention. It can enormously improve the data-transmission rate and the reliability in complex environments of wireless communication without increasing the spectrum bandwidth and the transmission power. Space-time code is a way which can implement the performance of the MIMO-OFDM. Some work has been done according to the researches at home and abroad.Firstly, difficulties faced by modern communication and the advantages of MIMO compared with traditional communication technologies have been described. The Multiple Input Multipe Output (MIMO) antenna technology and Orthogonal Frequency Division Multiplexing (OFDM) technology are analysised and researched separately. Secondly, several common code techniques have been introduced based on the established MIMO system. There are some analysis and comparisons between them. To Alamouti classical algorithm research and development, the code and not code of OFDM systems simulation results are analyzed and compared, the simulation results show that the code of the reliability of the system of OFDM after all got the bit error rate and greatly improved. Finally, as the limits of MIMO in the broadband, MIMO and OFDM are combined. After the theoretical analysis of STBC-OFDM and STFBC-OFDM, from the point of view of ber simulation analysis, the bit error rate in 10-2, coding system relative to STBC-OFDM system required signal-to-noise ratio of about 3 dB decline, improve the reliability of system. |
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