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室内可见光通信(VLC)的多光源阵列对称放置在房间的天花板上,光从LED光源出发经过直射、反射到达接收机端,在同一接收平面用户的接收光功率和照明强度不相等致使不能享受同等的通信服务质量,难以保证通信的公平性。针对通信系统中光源放置位置导致接收平面的接收光功率和照明强度分布由房间中心向周围快速衰减的问题,通过在4×4LED发射阵列端配备功率调节因子,利用蚁群算法建立与接收光功率和照明强度相对应的节点和路径的模型,提出使用方差作为评价接收光功率和照明强度均匀化的目标函数,构建能见度表达式据此推导出状态转移概率公式,并根据LED发射阵列和接收机位置对称的要求选取一组优化功率调节因子值。仿真结果表明,接收光功率和照明强度的方差分别从优化前的168 252和653 742降低到优化后的19.266 3和74.859 2,接收平面接收光功率和照明强度分布不均匀性得到明显改善。
Indoor light communication (VLC) multi-light source array symmetrically placed in the ceiling of the room, starting from the LED light source through the direct reflection of the receiver to reach the receiver side in the same receiving plane users receive optical power and illumination intensity can not enjoy the same The quality of communication services, it is difficult to ensure the fairness of communications. Aiming at the problem that the receiving optical power and the illumination intensity distribution of the receiving plane rapidly attenuate from the center of the room toward the surroundings for the placement of the light source in the communication system, an ant colony algorithm is used to establish and receive the optical power by arranging the power adjusting factor on the 4 × 4 LED transmitting array end Based on the models of nodes and paths corresponding to the intensity of illumination, this paper proposes the use of variance as the objective function to evaluate the received light power and illumination intensity, constructs the visibility expression and deduces the formula of state transition probability. Based on the LED emission array and receiver Position symmetry requires choosing a set of optimal power factor values. The simulation results show that the variances of received light power and illumination intensity decrease from 168 252 and 653 742 before optimization to 19.266 3 and 74.859 2 after optimization, respectively. The received light power and illumination intensity distribution unevenness are obviously improved.