基于低轨卫星的并行DMF-RAKE接收机  

Parellel DMF-RAKE Receiver Based on LEO

作　　者：余平[1] 黄天聪[1] 林金朝[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2003年第8期74-77,共4页Journal of Chongqing University

基　　金：教育部重点项目;教育部博士点基金项目资助

摘　　要：在低轨卫星通信中,尤其是在低仰角通信时,进入接收机的通常是多径信号而不是直视信号,此时多径衰落和干扰特别严重,常采用高增益扩频技术,需要实现对长周期扩频码的捕获。针对这一问题,提出了一种基于并行数字匹配滤波器组的瑞克接收机,对其在瑞利衰落信道中的性能进行了分析。该接收机能在确保对长扩频码的整周期自相关的基础上,对各多径信号进行最大比合并,提高了信噪比,以有效地抗衰落。仿真结果表明了方案的正确性。In the scenario of low elevation of the LEO (Low Earth Orbit) communication, it is usually the multipath signals instead of the LOS (Line of Sight) signals that enter the receiver. Then the high gain spread-spectrum is often introduced to mitigate the muitipath fading and the interferences. So we propose a RAKE receiver based on parrelled DMF (Digital Matched Filter) in view of the acquisition of the corresponding long PN (pseudo noise) codes. It can assure getting the autocorrelation over the PN code period and achieving the MRC (Maximum Ratio Combination) results of the multipath signals, so as to anti-jams and restrain the multipath fading effectively. The simulation results verify the validity of this RAKE structure.

关 键 词：低轨卫星通信 扩频 并行数字匹配滤波器 瑞克接收机 

分 类 号：TN914.42[电子电信—通信与信息系统] TN927.2[电子电信—信息与通信工程]