关键词: 多输入多输出系统, 自适应调制, 不等错误保护, 最小发射功率

Abstract:

In order to improve the transmission quality of multimedia data in wireless communication,this paper proposes an adaptive modulation algorithm to realize the unequal error protection（UEP） for the data transmission in multiple-input multiple-output（MIMO） system.As the power gains of sub-channels of the spatial correlation MIMO system are greatly different in narrowband flat fading environment,the sub-channels are divided into two groups to transmit high-and low-quality data,respectively.Moreover,according to the demands of transmission quality and rate of input data,the modulation order and transmission power of each sub-channel are adaptively adjusted to minimize the total transmission power.Simulated results indicate that the proposed algorithm can effectively control the bit error rate of data and realize the unequal error protection with a minimum transmission power.

Key words: multiple-input multiple-output system, adaptive modulation, unequal error protection, minimum transmission power