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提出了一种可在频率选择性信道中获得分集增益的满速率满分集空时码.由于所设计方案在不同的天线上设置不同的随机交织器,因此称之为空时交织码.证明了该码满足准静态频选衰落信道满分集准则,并且无速率损失.由于方案仅在各天线处增加交织器,因此易于推广至多个发射天线的场景.同时交织器还使接收机可通过迭代检测逼近最大似然检测性能,因此分别设计了两种迭代接收结构,一种是直接在卷积关系与相等关系间迭代,另一种是在叠加关系、多路卷积关系与相等关系间进行迭代.这些简化了接收机复杂度,使之随发射天线数线性增长.与频选信道中的其他空时码方案相比,该方案在速率、分集以及复杂度方面做出了有效折中.仿真表明,瑞利块衰落信道中该码性能接近多重分集理论曲线.
A full rate space-time full-rate space-time code which can obtain diversity gain in frequency-selective channel is proposed. Since the designed scheme sets different random interleavers on different antennas, it is called space-time interleaving code. The code satisfies quasi-static frequency-selective fading channel full-diversity criterion with no rate loss. Since the scheme only adds interleavers at each antenna, it is easy to generalize to multiple transmit antenna scenarios. The interleaver also allows the receiver to iteratively detect Therefore, two kinds of iterative reception structures are designed, one is to iterate directly between convolution and equality, and the other is to iterate over the relationship of superposition, multi-channel convolution and equality This simplifies the receiver complexity and increases linearly with the number of transmit antennas.Compared with other space-time coding schemes in frequency-selective channel, this scheme makes an effective trade-off between rate, diversity and complexity. It shows that the code performance in the Rayleigh block fading channel is close to the multi-diversity theoretical curve.