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在采用相干检测方法的发射分集方案中,进行信道估计需要付出很高的代价,为了降低接收端的实现复杂度,根据时域同步正交频分复用(TDS-OFDM)系统结构的特点,提出了差分空频发射分集及相应的非相干检测方法。该方法在时域进行差分编码,而在频域进行空频编码以获得分集增益。理论分析和仿真结果表明,尽管非相干检测方法损失了一定的接收性能,但无需进行信道估计,在慢衰落和快衰落信道中均能适用,是一种比较好的实现复杂度与接收性能之间的折衷方法。
In the transmit diversity scheme using coherent detection, channel estimation is costly. In order to reduce the implementation complexity of the receiver, according to the characteristics of the structure of the time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system, Differential space-frequency transmit diversity and corresponding non-coherent detection methods. This method performs differential coding in the time domain and space-frequency coding in the frequency domain to obtain diversity gain. The theoretical analysis and simulation results show that although the incoherent detection method has some loss of reception performance, it does not need channel estimation and can be applied in both slow fading and fast fading channels, which is a good implementation complexity and receiving performance A compromise between methods.