无线紫外光MIMO通信线性注水功率分配方法

Linear Water-Filling Power Allocation Method in Wireless MIMO Ultraviolet Communication

将无线紫外光多输入多输出(MIMO)通信与线性注水算法相结合,首先建立基于线性注水算法的无线紫外光非直视MIMO通信模型,并推导出其信道容量模型,然后在信号发射端采用等功率分配和线性注水算法两种方法进行功率分配,研究在无线紫外光非直视MIMO通信系统中采用这两种方法对通信系统中信道容量的影响,并进行仿真分析验证。仿真结果表明,在信噪比相同的情况下:当收发天线不对称时,采用线性注水算法进行功率分配相比于等功率分配算法,无线紫外光非直视MIMO通信信道容量得到显著提升;当收发天线对称,在信噪比较小时,利用注水算法可以明显提高信道容量,而在信噪比提高达到一定值后,采用注水算法进行功率分配的信道容量逼近等功率分配的信道容量。

In this paper,wireless multiple-input multiple-output(MIMO)ultraviolet communication is combined with a linear water-filling algorithm.First,a wireless non-line-of-sight(NLOS)MIMO ultraviolet communication model based on the linear water-filling algorithm is established and its channel capacity model is derived.Then,the equal power allocation algorithm and the linear water-filling algorithm are used for power allocation at the signal transmitter.The influences of these two methods on the channel capacity of the wireless NLOS MIMO ultraviolet communication system are studied,and simulation analysis and verification are conducted.The simulation results show that at the same signal-to-noise ratio(SNR),when the transmitting and receiving antennas are asymmetrical,the channel capacity of the communication system adopting the linear water-filling algorithm in wireless NLOS MIMO communication is significantly higher than that of the system employing the equal power allocation algorithm.When the transmitting and receiving antennas are symmetrical and the SNR is small,the water-filling algorithm can significantly improve the channel capacity.When the SNR increases to a certain value,the channel capacity of power allocation obtained via the water-filling algorithm is close to that obtained via the equal power allocation algorithm.