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近年来,宽带无线通信技术和应用得到了迅猛的发展。人们对无线数据和多媒体业务的需求,促进了用于高速宽带无线通信的诸多新技术的发展和应用。其中,MIMO技术利用多径效应,能够极大改善无线通信的频谱效率和通信可靠性。OFDM技术具有优越的频谱效率,两者的结合即MIMO-OFDM技术被认为是未来移动通信系统的关键技术。本文简要介绍MIMO技术和OFDM的基本原理,MIMO-OFDM系统以及空时编码技术在MIMO-OFDM系统中的应用。
In recent years, broadband wireless communication technologies and applications have been rapidly developed. The demand for wireless data and multimedia services has promoted the development and application of many new technologies for high-speed broadband wireless communications. Among them, MIMO technology utilizes the multipath effect, can greatly improve the spectral efficiency and communication reliability of wireless communications. OFDM technology has superior spectral efficiency, the combination of the two that MIMO-OFDM technology is considered the key technology of the future mobile communication system. This article briefly introduces the basic principles of MIMO technology and OFDM, MIMO-OFDM system and space-time coding technology in MIMO-OFDM system.