Iterative rake structural decision feedback equalization in linear single frequency network of Chinese high speed railway television system

The Chinese High Speed Railway Television (HSRT) has become a new hotpot among applications of broadcasting technology. In this paper, we consider a kind of network infrastructure based on signal frequency network (SFN) design. The character of linear SFN in the railway television system is that receiver between two transmitters will receive signal from both base stations. When single carrier system is adopted as the modulation/demodulation technique, decision feedback equalization (DFE) is used to combat the interference brought by SFN and reflected signals. However, traditional DFE may waste the signal power of dispersive channels. Thus it is not the most effective method in the linear SFN of railway television. To deal with this problem, we propose an iterative rake structural DFE algorithm with cancellation (IR-DFE-C). Theoretical analysis and simulation show that IR-DFE-C algorithm utilizes the power of multipath channels more efficiently than traditional time domain decision feedback equalization (TD-DFE). Moreover, this IR-DFE-C will not be affected by the deep fading problems in frequency domain. Therefore it has advantages over both TD-DFE and frequency domain linear equalization (FD-LE) method which has the problem of noise enhancement in such circumstances.