基于OFDMA的多小区协作可见光通信系统二维功率分配算法

Two-dimensional power allocation algorithm for multi-cell coordinated visible light communication system based on OFDMA

为了消除可见光通信系统中多小区和多用户信号干扰,提出一种基于正交频分多址(OFDMA)的多小区协作可见光通信系统二维功率分配算法。首先,根据信道情况,采用OFDMA多小区协作资源分配算法给信道情况差的用户分配更高的功率;然后,根据信道信息求解共照区域用户多个协作发光二极管(LED)的发送功率比,得到最优的目标叠加星座。仿真结果表明:与平均功率分配算法相比,一维功率分配算法误码率性能平均提升了16%;与一维功率分配算法相比,二维功率分配算法误码率性能平均提升了10%。

In order to eliminate interference from multi-cell and multi-user signals in visible light communication systems,a two-dimensional power allocation algorithm based on orthogonal frequency division multiple access(OFDMA)for multi-cell collaborative visible light communication systems is proposed.Firstly,based on the channel situation,an OFDMA multi-cell collaborative resource allocation algorithm is adopted to allocate higher power to users with poor channel conditions.Then,based on the channel information,the transmission power ratio of multiple cooperative light emitting diode(LED)in the shared illumination area is calculated to obtain the optimal target superposition constellation.The simulation results show that compared with the average power allocation algorithm,the bit-error rate of one-dimensional power allocation algorithm is improved by 16%on average.Compared with the one-dimensional power allocation algorithm,the bit-error rate of the two-dimensional power allocation algorithm is improved by 10%on average.