红外无线系统的变步长自适应功率分配算法  

Variable-step-size adaptive power allocation algorithm for infrared wireless communication

作　　者：黄爱萍[1] 樊养余[1] 李伟[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710129

出　　处：《红外与激光工程》2011年第7期1328-1332,共5页Infrared and Laser Engineering

基　　金：重点实验室基金(9140C5301010701);陕西省自然基金(2007F10)

摘　　要：红外无线通信系统中,为了在功率和误码率一定的限制下进一步提高系统容量,提出了一种新的变步长自适应功率分配算法,该算法以每比特分配功率的代价最小为原则(一次可分配多个比特)来选择最佳的调制技术。分析了其速度原理,并在建立模型的基础上,通过仿真研究了新算法的系统性能,并与理想注水算法以及传统的简单速率量化算法进行比较。仿真结果表明,新算法在满足误码率和功率恒定的情况下,其系统容量曲线比简单速率量化算法更接近于理想的容量曲线,即更有效地分配了发射功率。因此,变步长自适应功率分配算法在室内无线激光通信的应用中具有一定的意义。In order to further enhance the system capacity under certain restrictions of transmitter power and bit error rate（BER） in infrared wireless communication,a novel variable-step-size（VSS） adaptive power allocation algorithm was proposed,which was based on selecting the best modulation technique that costed minimum distribution of power per bit（more bits can be assigned one time）.By analyzing the distribution principle and on the basis of the established model,the performance of VSS algorithm was calculated and compared with the ideal water-filling algorithm and traditional simple rate（SR） solution.Simulation results show that under the same circumstance,the new VSS algorithm follows the ideal capacity curve much smoother and allocates the available Tx power much more effectively than the SR solution.Thus,the VSS algorithm has a certain significance when applied in indoor wireless optical communication.

关 键 词：红外无线通信 变步长自适应功率分配算法 发射功率 比特分配 

分 类 号：TN929.1[电子电信—通信与信息系统]