STBC协同OFDM系统快速迭代ICI消除的信干比计算

SIR Calculation for Fast Iterative ICI Cancellation in STBC Cooperative OFDM System

针对空时分组编码的协同正交频分复用系统,提出了快速迭代消除子载波干扰的信干比计算方法.该方法用每次迭代的初始值代替发送信号,实现接收信号信干比的计算,对于相对频偏较大的情况,可结合频偏补偿方法进行计算.误差分析和仿真数据表明:信噪比大于10 dB时,采用这种方法计算信干比与理论信干比的相对误差小于10^(-2).

Based on the space time block coding （STBC） cooperative orthogonal frequency division multiplexing （OFDM） system, a method for calculating signal-to-interference ratio （SIR） is proposed to cancel inter-carrier interference （ICI） iteratively. By using the initial value of each iteration step instead of the trans- mitted signal, the method can calculate SIR of the received signal. For large frequency offset, a frequency compensation scheme is used. Error analysis and simulation results show that, when SIR is above 10 dB, difference between the SIR obtained with the proposed method and the theoretical results is below 10^-1.