一种基于延时信道状态信息的MIMO-OFDM系统自适应功率分配算法

在基于正交频分复用的多输入多输出（multiple-input-multiple-output-orthogonal frequency divided multiplexing，MIMO-OFDM）系统中，适当的功率分配方案能够显著提高系统吞吐量，但是其复杂度往往较高。研究MIMO-OFDM系统的自适应功率分配问题。以系统的和速率最大化为目标，根据延时的信道状态信息在所有空间子信道之间分配功率，同时满足各子信道的误码率约束与系统总功率约束。根据MIMO空间子信道的特点提出了一种复杂度很低的功率分配算法，并分析了算法复杂度。在IMT-2000信道中的仿真表明，提出算法的性能优于已有的次佳算法。

An adaptive power allocation algorithm using delayed channel state information for MIMO-OFDM systems

Appropriate power allocation schemes can increase the throughput considerably in MIMO(multiple-input-multiple-output)-OFDM(orthogonal frequency divided multiplexing) systems, but usually with highly computational complexity. The problem of adaptive power allocation is addressed for MIMO-OFDM systems in this paper. Aiming to maximize the system sum-rate, the overall power is allocated among spatial subchannels based on delayed channel state information; at the same time the total power constraint and bit-error-rate requirements are satisfied. A power allocation algorithm with low complexity is proposed on the basis of the characteristic of spatial subchannels. Then its computational complexity is analyzed. Simulations in IMT-2000 channels demonstrate that the proposed algorithm outperforms existing sub-optimal algorithms.