基于OFDM系统的空时频分组编码方案  

Space-time-frequency block coding for OFDM systems

作　　者：罗微[1] 吴诗其[1] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都610054

出　　处：《系统工程与电子技术》2005年第3期391-394,434,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金资助课题(60272009)

摘　　要：提出了一种空时频分组编码方案,其设计思路是:接收端通过子信道的相关特性确定不相关子载波组,并反馈给发射端;发射端基于反馈信息,利用星座旋转预编码矩阵和空时分组编码技术构建空时频分组编码。该方案只反馈子信道的相关性而无需反馈整个信道信息,可应用于任意数量的发射/接收天线,能获得极高的分集增益和带宽效率,且只有较低的解码复杂度。在瑞利衰落环境下的仿真结果证实了此方案的鲁棒性。A space-time-frequency block coding scheme for orthogonal frequency division multiplexed (OFDM) systems is derived. The design thinking is to obtain the maximum uncorrelated group of subcarriers according to the sub-channel correlation properties, then to feed it back to transmitter, thus constructing the space-time-frequency block code using the constellation-rotating precode matrix and space-time block code. The proposed scheme allows for any number of transmit and receive antennas, and can attain improved diversity gains and very high bandwidth efficiency with low decoding complexity. The robustness of the proposed design over Rayleigh fading channels is verified by simulations.

关 键 词：空时频分组编码 正交频分复用 不相关子载波组 星座旋转预编码矩阵 

分 类 号：TN919[电子电信—通信与信息系统]