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在数字电视地面广播中,为了消除时域同步正交频分复用(TDS-OFDM)技术在发射分集应用中的相互干扰,提出了频域二值块通序列的设计方法。该序列频域块状连续、正交、自相关性良好,且具有零互相关特性,可以很好地满足TDS-OFDM发射分集系统对时域快速同步和相互干扰消除的要求。分析了用该发射分集系统结构和信道估计算法。仿真结果表明:和传统的单天线低密度校验编码(LDPC)系统相比,该发射分集系统在慢衰落信道下可以获得1～3 dB的分集增益。
In digital terrestrial television broadcasting, in order to eliminate the mutual interference of time-domain synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) technology in transmit diversity applications, a design method of binary block sequence in frequency domain is proposed. The frequency domain block has continuous, orthogonal, good autocorrelation and zero cross-correlation characteristics, which can meet the requirements of TDS-OFDM transmit diversity system for fast synchronization and mutual interference cancellation in the time domain. The structure of the transmit diversity system and the channel estimation algorithm are analyzed. The simulation results show that this transmit diversity system can achieve a diversity gain of 1 ~ 3 dB under the slow fading channel compared with the traditional single-antenna low-density parity-check (LDPC) system.