一种带有CFO补偿的OFDMA上行链路Turbo接收机  

A CFO-compensation based turbo receiver for OFDMA uplink

作　　者：郭俊奇[1] 尚勇[1] 项海格[1] 

机构地区：[1]北京大学电子学系卫星与无线通信实验室,北京100871

出　　处：《高技术通讯》2010年第9期881-887,共7页Chinese High Technology Letters

基　　金：863计划(2008AA01Z226)资助项目

摘　　要：提出了一种带有多用户载波频率偏移(CFO)联合补偿功能的迭代(Turbo)接收机,用于频率非同步环境下的正交频分多址(OFDMA)上行信号接收处理。基于频域Turbo均衡原理,该接收机实现了带有软干扰消除(SIC)的CFO补偿、最小均方误差(MMSE)频域均衡和最大后验(MAP)信道译码的联合迭代处理。理论分析和仿真结果均表明:与传统的非迭代接收机相比,文中所提Turbo接收机利用MAP译码器的软判决反馈信息实现了干扰重构和消除,在迭代中获得了更优的频率同步性能和误比特率性能;与现有几种典型的迭代接收机相比,文中所提Turbo接收机具有更优的误比特率性能和更低的实现复杂度。This paper presents a turbo receiver combined with carrier frequency offset （CFO） compensation for orthogonal frequency division multiple access （OFDMA） uplink transmission in frequency asynchronous environments. Based on the principle of frequency-domain turbo equalization, the proposed turbo receiver jointly perfonns soft interference cancellation （SIC） based CFO compensation, minimum mean square error （MMSE） based frequency-domain equalization and maximum a posteriori （MAP） decoding in an iterative fashion. The analysis and simulation results show that the proposed turbo receiver provides better frequency synchronization and bit error rate （BER） performance than that of conventional non-iterative receivers, since it employs soft feedback derived from MAP decoders to reconstruct and eliminate interferences in iterative process. Moreover, the proposed receiver achieves better BER performance and lower complexity than some existing turbo receivers for OFDMA uplink.

关 键 词：正交频分多址(OFDMA) 载波频率偏移(CFO) 补偿 迭代(Turbo)接收机 软干扰消除(SIC) 

分 类 号：TN929.531[电子电信—通信与信息系统]