数字电视多媒体广播系统的相位噪声抑制

Phase-noise suppress scheme for DTMB system

摘要:

为提高数字电视多媒体广播(DTMB)系统抗相位噪声的能力,提出了利用DTMB系统保护间隔内所填充的PN序列的时域公共相位误差校正方案,以及利用传输参数信令(TPS)的判决辅助子载波间干扰抑制方案.计算机仿真结果表明,该方法可有效地抑制接收机本振相位噪声引起的相位旋转和子载波间干扰,降低系统误符号率.而且时域公共相位误差校正方案具有抗噪声、抗干扰能力强的优点.

Abstract:

To improve the phase noise immunity of Chinese Digital Terrestrial/Television Multimedia Broad-casting ( DTMB) system,a time domain CPE ( Common Phase Error) correction scheme utilizing PN sequence which was filled in the guard interval of DTMB signal frame,and a decision aided ICI ( Inter-Carrier Interference) eliminating scheme which used Transmission Parameters Signaling ( TPS) in DTMB signal frame,were proposed. Simulation results showed that the proposed schemes can eliminate the ICI and CPE,which were caused by phase noise of receiver local oscillator,and improve the symbol error rate. In addition,the time domain CPE correction scheme exhibits excellent performance in strong noise and interference environment.