为了提高MIMO-OFDM系统的数据传输率和频谱利用率,提出一种新的自适应算法。该算法在保证信道质量所需误码率和总发射功率的前提下,按照各个子载波衰落程度动态地分配比特和功率,使系统的总数据传输速率最大。理论分析得出,该算法降低了系统运算复杂度,能很大地改善系统的整体性能。-In order to improve data transmission rates and spectrum efficiency of MIMO-OFDM systems,this paper proposes a n

This paper describes the protocol reference model of WiMAX，then analyzes the main features of WiMAX physical layer ． Furthermore，we gives the realization mode of WiMAX physical layer,i．e．WMAN—SC，WMAN—SCa，WMAN—OFDM， WMAN—OFDMA，WirelessHUMAN．In c