低复杂度的OFDM系统有效吞吐量最大化算法

Algorithm for goodput maximization in OFDM systems with low complexity

针对OFDM系统有效吞吐量最大化问题,提出了一种低复杂度的资源分配算法LCGM.该算法的子载波采用统一的编码调制方式,以等误比特率的方式分配功率,并在此条件下将有效吞吐量最大化问题进行简化.利用有效吞吐量函数在平坦衰落信道和频率选择性衰落信道下为单峰函数这一特点,通过引入一种新的等效信道增益,采用二分法确定数据占用的子载波集合.仿真结果表明,LCGM算法以较低的复杂度获得了与高复杂度算法相当的有效吞吐量,在性能和复杂度之间取得了较好的折中.

Aiming at the problem of goodput maximization in OFDM systems,a low complexity goodput maximization（LCGM） algorithm was proposed.A uniform coding and modulating manner was applied in the sub-carrier of the algorithm,and the power allocation was accomplished in an equal bit error rate（BER） mode.Under the above-mentioned conditions,the goodput maximization problem was simplified.With the feature that the goodput function is actually a unimodal function in both flat fading and frequency selective fading channels,a new equivalent channel gain was introduced and a bisection method was used to determine the sub-carrier set occupied by data.The simulation results show that the LCGM algorithm with lower complexity exhibits the equivalent goodput compared with the algorithms with high complexity,and achieves a better tradeoff between both performance and complexity.