基于基扩展的快时变多径信道建模与估计  

BEM-based Fast Fading Channel Modeling and Estimation

作　　者：王开华[1] 胡雅洁[1] 胡健伟[1] 曲君跃 李晓鹏[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《数学的实践与认识》2015年第14期181-191,共11页Mathematics in Practice and Theory

摘　　要：建立了离散化时变信道的简化模型,能够同时反映出高速移动通信环境中的快时变与多径传播两种特性;建立了快变信道的基扩展逼近模型,同时对基函数扩展阶数和系数进行优化,以进一步降低模型算法的复杂度;建立了适用于快变信道的帧格式优化模型,优化系统导频数,进一步提高系统的传输效率.对三种典型的基函数(复指数基、离散卡洛基和多项式基)进行了性能分析,并从精度、稳健性、复杂度等方面进行了比较.根据新的离散化时变信道模型,建立了基于Jakes模型的快变多径信道仿真器,搭建了一个实用的通信系统仿真平台,通过仿真系统的BER性能验证了所建模型的有效性.In this work,the simplified discrete time-varying channel model is built up to study the characteristics of fast-fading and multi-path fading channels.A BEM-based fast fading channel is also established to optimize the coefficients and orders of the basic functions and to reduce the complexity of the algorithms.To investigate the fast-fading channel,the frame structure is optimized to increase the system efficiency.The performance of three typical basic functions（CE-BEM,DKL-BEM and P-BEM） is presented in this work,including the precise,robust and complexity.Based on the discrete time-varying channel model and Jakes＇ channel model,a fast fading channel is established to simulate the BER performance.Thus the efficiency of the proposed model in this work is verified,

关 键 词：基扩展 快时变信道 帧结构优化 Jakes信道模型 误码性能 

分 类 号：TN929.5[电子电信—通信与信息系统]