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IEEE802.16d协议主要是针对有中心式移动台低速运动的宽带无线接入系统。该系统为了适应各种物理信道条件并达到通信质量和传输速率的最优化,采用了7种调制和信道编码组合方案。但IEEE802.16d并没有提出详细的自适应链路算法,提出了一种在下行物理帧FCH数据段加入导频信息,然后移动台通过接收到的导频信息估计CINR并通过一个简单有效的滑动窗口根据时变信道自适应地变化来捕捉信道的特征CINR,利用这个特征CINR来对照仿真得到的CINR-10-6BER门限值控制调制和信道编码,达到链路自适应的目的。
IEEE802.16d agreement is mainly aimed at the central mobile broadband low-speed broadband wireless access system. The system in order to adapt to a variety of physical channel conditions and to achieve the optimization of communication quality and transmission rate, using a combination of seven modulation and channel coding scheme. However, IEEE802.16d does not propose a detailed adaptive link algorithm, and proposes a method of adding pilot information to the FCH data segment of the downlink physical frame, and then the mobile station estimates the CINR by using the received pilot information and passes a simple and effective sliding The window adaptively changes according to the time-varying channel to capture the characteristic CINR of the channel, and uses this characteristic CINR to control the modulation and the channel coding according to the simulated CINR-10-6BER threshold to achieve the purpose of link adaptation.