在频率选择性信道中的差分空频编码

本文提出了频率选择性衰变信道中采用了差分空频编码的正交频分复用(OFDM)传输方法。根据信道长度,我们将每个天线OFDM帧中的输入数据分组,同一组中各天线上的数据编码组成为一个对角信号星座,沿频域方向独立的对每组信号实施差分编码。通过分析成对错误概率,我们证明了这种码潜在能提供的分集是发射天线数,接收天线数和信道长度的乘积,比差分空时码具有更大分集增益,因而具有更好的性能,这一分析结果也为我们的仿真实验证实了。

Differential Space-Frequency Coding Over Frequency-Selective Fading Channels

This letter present a differential space-frequency coded orthogonal frequency-division multiplexing (OFDM) scheme over frequency-selective fading channels. According to channels length ,we divide the data set of all antennas in a OFDM frame into many groups, Every group data is independently mapped into signal point in a diagnal signal constellation. Within each group, differential space-time encoding is performed in frequency direction. By analyzing the pairwise error probability ,we show that the scheme can potentially provide a diversity order as the product of the number of transmitter antennas ,the number of receiver antennas and channel lenth. Therefore, the coding scheme has better performance than differential space-time coding , which is in good accordance with the presented simulation results.