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针对室内可见光通信(VLC)中接收平面接收光功率和接收光照强度分布不均匀的问题,提出了一种基于改进的蚁群算法对其进行优化。通过建立发射端和接收端的信道模型,对放置在天花板上的4×4的LED阵列发射端配备功率调节因子,并利用改进的蚁群算法对功率调节因子进行优化。针对传统蚁群算法存在的收敛速度慢、容易停滞等问题,提出了采用自适应信息素更新的策略。仿真结果表明,利用所提方法优化后,接收光功率和照明强度的波动范围分别在93.523~50.453μW和367.846~192.798Lux,接收平面上接收到的光功率和照明强度分布不均匀的问题得到了明显改善。
Aiming at the problem of uneven received light intensity and receiving light intensity in VLC, an improved ant colony optimization algorithm is proposed. By setting up the channel models of transmitter and receiver, the 4 × 4 LED array transmitters placed on the ceiling are equipped with power adjustment factors and the power factor is optimized by the improved ant colony algorithm. Aiming at the problems of traditional ant colony algorithm such as slow convergence speed and easy stagnation, the strategy of adaptive pheromone updating is proposed. The simulation results show that the optimal range of the received optical power and illumination intensity is 93.523 ~ 50.453μW and 367.846 ~ 192.798Lux, respectively. The received optical power and illumination intensity distribution are unevenly distributed on the receiving plane Significant improvement.