基于MIMO信道误差模型的保障QoS的自适应调制

An adaptive modulation scheme for multiuser MIMO system guaranteeing QoS by using channel error model

以系统总速率最大化为目标,提出了一种基于信道误差模型的多用户MIMO下行系统保障用户QoS的资源分配机制.基站应用空分多址接入(SDMA),同时支持多个用户,利用线性预编码方法抵消用户间的干扰,提出发射端在非理想信道信息情形下提供用户QoS保障的自适应调制方案.为降低系统复杂度,提出应用于实际系统的次优算法.仿真结果表明:所提出的次优算法在将指数级复杂度变为线性复杂度的同时,性能非常接近最优算法.

An adaptive resource allocation scheme for downlink multiuser MIMO system guaranteeing QoS based on the channel error model was proposed to maximize the sum-rate. Spatial division multiple access （SDMA） were used in the basestation to support several usersr simultaneous transmission. The inferences among users were reduced by precoding. An adaptive modulation scheme for guaranteeing QoS was proposed under imperfect channel state information at the base station. Because the brute-force search was computationally prohibitive, a low-complexity suboptimal algorithmnused in practical systems was given. Simulation results showed that the suboptimal algorithm could convert exponential complexity to linear one, achieving almost the same performance as the optimized one.