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随着正交频分复用(OFDM)系统应用环境的增多,需要定义更多的信令信息以实现系统物理层配置的多样性,从而使得在不同信道环境下系统均具有与之较匹配的模式并实现最佳性能。欧洲第二代数字地面广播DVB-T2系统中就定义了2种分集模式、7种保护间隔以及6种快速Fourier变换(FFT)长度。该文在该系统基础上,提出以多个训练序列之间相对距离传输信令的方法,并对传输序列的数量、携带信息量及误检门限进行了分析。研究和仿真表明:该方法在提高了信令信息的传输容量的同时,减小了相关器的复杂度,并且达到了DVB-T2系统S2信令的误码性能。
With the increase of Orthogonal Frequency Division Multiplexing (OFDM) system application environment, more signaling information needs to be defined in order to realize the diversity of the system physical layer configuration, so that the system has more matching in different channel environments Model and achieve the best performance. Two diversity modes, seven guard intervals, and six fast Fourier transform (FFT) lengths are defined in the DVB-T2 system for the second generation of digital terrestrial broadcasting in Europe. Based on this system, this paper proposes a method of transmitting signaling with relative distance between multiple training sequences, and analyzes the number of transmitted sequences, the amount of carried information and the threshold of false positives. The research and simulation results show that this method can reduce the complexity of correlator and improve the bit error rate of S2 signaling in DVB-T2 system while improving the transmission capacity of signaling information.