针对当前OFDM系统中的比特分配算法复杂度比较高，不适合运用于自适应调制系统中，提出改进的自适应比特分配调整算法，采用变步长调整的思想，进一步简化比特分配的复杂度。在此基础上，将OFDM和MIMO技术结合，进行MIMO-OFDM系统的相关参数仿真并进行分析。通过仿真说明本文介绍的算法计算复杂度小，成本较低，适用多用户，能够很好的应用到实际中。%The Orthogonal Frequency Division Multiplexing （OFDM Division Multiplexing） Orthogonal, some is the most popular attention after the 3G mobile communication technology. It will be the high-speed data flow decompose into N lowspeed flow of data, and improve the utilization rate of spectrum greatly improve the performance of wireless communication system. The paper introduces the adaptive technology OFDM current research and application, the system is discussed in detail the OFDM structure and adaptive technology combining AOFDM after the structure and properties of the system. On this basis, combining with the current research hotter MIMO OFDM muhiple-nput multiple-output （MIMO） and technology, technology, simply introduces adaptive mimo-ofdm system of knowledge for mimo-ofdm related parameters of the system simulation and analysis. Some algorithms that is introduced in this paper in computational complexity is small, low cost. It can be very good to practice.
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