国标双模数字电视PAL同频干扰消除算法研究

PAL Co-channel Interference Cancellation in GB Dual-mode DTV

提出了一种针对国标双模数字电视接收机的PAL制模拟电视同频干扰(CCI)消除方案。利用PAL制模拟电视信号能量主要集中在亮度、色彩和声音载波,且相对位置已知,可以在亮度载波段进行CCI是否存在的检测,若存在,则在三干扰频段内消除CCI。该方案极大地降低了算法复杂度和硬件开销。仿真结果表明:AWGN信道,多载波模式下,有CCI消除比无CCI消除有1～2dB的增益;单载波模式下,加CCI限幅消除后,系统性能有了很大提高,且当CIR减小到-3.5dB时,可达到TOV点(BER=3×10-6)。

A method to cancel phase alternating line(PAL) analog TV co-channel interference(CCI) in GB dual-mode digital TV receiver is proposed.It uses the PAL analog TV signal power is concentrated in the brightness,color and sound carriers and their relative position is known.Thus we can detect the existence of CCI in brightness carrier band,then cancel CCI in three interference band,greatly reducing the complexity of algorithm and hardware costs.The simulation result indicates:AWGN channel,In the multi-carrier mode,there is 1～2 dB gain using this CCI cancellation method and in the sigle-carrier mode,the system performance is greatly improved,and when the CIR is -3.5 dB,can reach TOV point(BER=3×10-6).