IEEE 802.11n系统中自适应混合优化功率分配算法

Adaptive hybrid optimization power allocation algorithm in IEEE 802.11n system

为解决IEEE 802.11n系统中的功率浪费现象,提出了一种先注水后调和平均值(first-water filling-last-harmonic,FWLH)的自适应混合优化功率分配算法。首先利用注水算法(water-filling algorithm)计算判别信道质量的阈值,对阈值以下的信道关闭不分配功率,对阈值以上的信道采用调和平均值算法(harmonic algorithm,HARM)进行功率分配。仿真表明,在误码率方面,FWLH算法比注水算法和HARM算法分别降低了大约100倍和20倍,使用FWLH算法的系统容量优于HARM算法,与使用注水算法的系统容量十分接近。

In order to solve the problem of wasting power, proposed a novel adaptive hybrid optimization power allocation algorithm named first-water filling-last-harmonic （FWLH） . Adopted in FLWH algorithm, water-filling algorithm to compute the threshold which was used to estimate the quality of the sub-channels and Harmonic algorithm （HARM） was used to close the sub-channels below the threshold and allocate the power to the ones above the threshold. Simulation results show that the system capacity with FWLH algorithm is quite close to water-filling algorithm and superior to HARM algorithm, furthermore, the system BER （ bit error ratio） with FWLH algorithm is about 100 times lower than that of with water-filling algorithm and about 20 times lower than that of with HARM algorithm.