MIMO OFDM系统中统计信道信息的速率最大化

Algorithm for maximizing the transmit rate in MIMO OFDM system using statistical channel information

提出了一种利用多输入多输出正交频分复用(MIMO OFDM)系统的统计信道信息进行自适应资源分配的算法,并进行了仿真.该算法采用Alamouti空时编码、自适应波束成形以及自适应比特和功率分配等技术,其在恒定发射功率的条件下使得目标函数传输速率达到最大并保证系统的误码性能.与利用完整信道信息的算法相比,该算法考虑了信道时延、估计误差等因素,并减小了传输信道信息占用的开销.仿真结果显示,该方法能够大大提高系统的传输速率.

An adaptive resource allocation algorithm using the statistical channel information of the MIMO OFDM system is proposed and simulated. In the algorithm, Alamouti space-time code, adaptive beamformer, adaptive allocation of bits and power are used. The aim is to maximize the transmit rate under the constraints of the fixed transmit power and the prescribed error performance. In contrast to the algorithms using perfect channel information, our algorithm thought about the channel delay, estimate error, etc. , and descreased the overheads of transmit channel information. Simulation results show that the transmit rate can be increased greatly.