【摘要】 在无线分布系统采用交叉重叠覆盖的小区结构中,终端同时与多个基站天线通信,需要估计每个发送天线到接收天线的不同时偏和频偏。基于这种新型小区结构,提出了一种MIMO-OFDM分布系统下的多时偏、多频偏估计算法。在发送端使用适合这种需要的训练序列,接收端通过和本地序列分段相关的方法,可以在一个OFDM符号内估计出每个基站天线到终端天线的多个时偏和频偏。在三角形小区结构下对该算法进行了验证,瑞利衰落信道下的仿真结果表明,该算法具有较大的估计范围和较高的估计精度。更多还原

【Abstract】 In the cross-overlap-covered region of wireless distributed system, because the Mobile Station(MS) communicates with multiple Base Station(BS), different time offset and frequency offset from every transmitting antenna to receiving antenna need to be estimated at the same time. Based on this novel triangular cell communication system, in this paper, a multi-time offset and multi-frequency offset estimation algorithm in MIMO-OFDM distributed system is presented. Specifically designed sequence is adopted in the transmitter and local sequence subsection-correlation is used in the receiver. Multi-time offset and multi-frequency offset between BS Antenna and MS could be estimated in an OFDM symbol. The algorithm is verified in triangular cell communication system. Simulation results in Rayleigh fading channel suggest that the proposed algorithm can get an accurate synchronization among quite a large scope.更多还原