中国激光, 2017, 44 (10): 1006001, 网络出版: 2017-10-18
空间调制无线光多输入多输出通信系统中自适应功率分配算法
Adaptive Power Allocation Algorithm for Wireless Optical Multiple Input Multiple Output Communication System with Spatial Modulation
光通信 多输入多输出通信系统 自适应功率分配算法 离散输入连续输出无记忆信道 optical communications multiple input multiple output communication syste adaptive power allocation algorithm discrete-input continuous-output memoryless channe
摘要
在空间调制(SM)无线光多输入多输出(MIMO)通信(SM-OMIMO)系统中, 为了在调制方法固定的条件下使系统的传输容量最大化, 提出了一种新型自适应功率分配算法(PAA)。新算法采用蒙特卡罗模拟过程选择与具体信噪比(SNR)相对应的最优化功率分配系数。建立了室内通信环境模型, 推导了SM-OMIMO系统的离散输入连续输出无记忆信道(DCMC)容量表达式; 分析了新算法的分配原则及过程, 并仿真研究了其系统性能, 比较了不同发射接收阵组合条件下, 各分配算法对系统DCMC容量增益的影响。仿真结果表明, 低SNR条件下采用自适应PAA的系统DCMC容量明显高于传统的固定因子分配算法和均匀分配算法, 在高SNR条件下更易达到DCMC容量饱和值, 该结果可清晰表明信道的分集特征。因此, 采用自适应PAA是提高SM-OMIMO系统传输速率的有效途径。
Abstract
In order to maximize the discrete-input continuous-output memoryless channel (DCMC) transmission capacity under certain restriction of modulation scheme in wireless optical multiple input multiple output (MIMO) communication (SM-OMIMO) system with spatial modulation (SM), a novel adaptive power allocation algorithm (PAA) is proposed by the Monte Carlo simulation process. Power allocation coefficients are optimized adaptively for any signal noise ratio (SNR). A model of indoor communication environment is built, and DCMC capacity expression of SM-OMIMO is derived. The distribution principle and procedures of the algorithm are analyzed. Performance of the system is simulated. The effects of several allocation algorithms on DCMC capacity are compared under different combinations of transmits and receivers. Simulation results indicate that, under the condition of low SNR, the system DCMC capacity of system obtained by the proposed adaptive PAA is larger than that obtained by PAA with fixed factor and average PAA, and the proposed PAA is easier to achieve saturation value of DCMC capacity under the condition of high SNR. The results clearly demonstrate the diversity characteristics of the channel. Therefore, the adaptive PAA is capable of improving the transmission rate of SM-OMIMO system.
黄爱萍, 陶林伟. 空间调制无线光多输入多输出通信系统中自适应功率分配算法[J]. 中国激光, 2017, 44(10): 1006001. Huang Aiping, Tao Linwei. Adaptive Power Allocation Algorithm for Wireless Optical Multiple Input Multiple Output Communication System with Spatial Modulation[J]. Chinese Journal of Lasers, 2017, 44(10): 1006001.