一种用于交织多址系统中的低复杂度的交织方法

A low-complexity interleaving scheme in IDMA systems

针对传统交织多址(IDMA)系统中的交织器问题,提出了一种低复杂度的二维交织方法。该方法基于二维扩频的思想,分别在时域和频域对数据进行交织处理。同时,该方法对所有用户按照时域扩频码进行分组,用户组间采用不同的时域交织器,用户组内采用不同的频域交织器。仿真结果表明,该方法不但可以降低交织器的数量和长度,还可以降低IFFT/FFT操作和频域检测的复杂度。

For alleviating the problem of interleavers in conventional interleave division multiple access （IDMA） systems,this paper proposed a two dimensional interleaving scheme with low-complexity. Based on the idea of two dimensional spreading, the data is interleaved in both time and frequency domain. Meanwhile, all users are grouped by the time domain spreading factor. Different time domain interleavers are adopted in each group, and different frequency domain interleavers are adopted within the same group. According to the simulation results, this scheme can reduce not only the number and length of interleavers, but also the complexity of IFFT/FFT and frequency detection.