基于导频辅助的单载波空时分组编码传输技术  

Pilot-Aided Space-Time Block-Coded Transmission Technology in Single-Carrier System

作　　者：任术波[1] 郭俊奇[1] 陈江[1] 项海格[1] 

机构地区：[1]北京大学信息科学技术学院,北京100871

出　　处：《天津大学学报》2008年第3期315-320,共6页Journal of Tianjin University(Science and Technology)

摘　　要：研究了频率选择性衰落信道中采用2个发送天线1个接收天线的单载波Alamouti空时分组编码数据块传输技术.在传输系统发射端利用导频符号辅助的思想设计出伪噪声PN导频序列和信息数据的排布结构;接收端一方面利用导频PN序列循环相关的信道估计算法获得信道冲激响应估值,另一方面采用干扰抵消技术消除导频序列对接收信息数据的影响,之后引入单载波频域均衡技术对接收数据进行处理以克服信道的频率选择性衰落.仿真结果表明,这种基于导频辅助的单载波空时分组编码传输系统相对于单天线传输系统获得了空时结构所带来的全速率下的最大分集增益,具有比Alamouti空时分组编码与OFDM相结合的传输系统更高的数据传输效率和更好的系统性能.A data block transmission technology of Alamouti＇s space-time block codes with two transmit antennas and one receive antenna in single-carrier system was proposed over frequency-selective fading channels. Based on the idea of pilotaided block transmission, the structure of the transmitted data block composed of information sequences and Pseudo-Noise sequences which were considered as pilot symbols was presented at the transmitter. While at the receiver, not only could the estimated channel impulse responses be acquired by a channel estimation algorithm using pilot symbols, but a interference cancellation algorithm for eliminating interaction between pilot sequences and information sequences was also presented, then the single-carrier frequency-domain equalization was employed so as to conquer frequency-selective fading. Simulation results show that the system not only acquires maximum diversity gain brought by space-time structure at full rate compared with single-input single-output system, but also improves data transmission rate and performance compared with traditional OFDM system associated with Alamouti＇s space-time block codes.

关 键 词：频率选择性衰落 Alamouti空时分组编码 信道估计 单载波频域均衡 干扰抵消 

分 类 号：TN911.22[电子电信—通信与信息系统]