一种MIMO-OFDM系统空频分组码相位校正技术  

A Phase-adjusting Method for SFBC Scheme in MIMO-OFDM Systems

作　　者：张小京[1] 周世东[1] 王京[1] 

机构地区：[1]清华大学电子工程系微波与数字通信国家重点实验室,100084

出　　处：《微计算机信息》2006年第11X期126-128,85,共4页Control & Automation

基　　金："国家自然科学基金"(编号:90204001)资助;"国家863FuTURE计划"(编号:2001AA123012)

摘　　要：对于MIMO-OFDM系统,本文指出如果直接将空频分组码SFBC与使用了跨符号插值信道估计算法和“增/扣脉冲”同步技术的OFDM方案相结合,那么由后者引入的时域循环移位操作会破坏SFBC算法对于信道假设的有效性,从而导致空频分组码译码性能下降。针对这一现象,本文提出了一种频域相位校正的方法,使得校正后的等效频域信道能重新满足空频码对于信道的要求,进而使这类MIMO-OFDM系统在工程中更具有实用价值。For MIMO-OFDM systems, this paper indicates that the direct combination of SFBC and certain OFDM schemes with cross-symbol interpolating channel estimation and Add/Deduct-Pulse symbol synchronization will influence the validity of the channel assumption required by SFBC and hence reduce its performance, due to the circular-shift operation introduced by such OFDM schemes. A phase-adjusting method is proposed in this paper, which will make the adjusted channel spectral response meet the requirement of SFBC and enable MIMO-OFDM systems to be more practical in real applications.

关 键 词：空频分组码 多输入多输出系统 正交频分复用系统 

分 类 号：TN929.5[电子电信—通信与信息系统]