作　　者： ; ; ; ;

机构地区： 电子科技大学电子工程学院

出　　处： 《电子与信息学报》 2004年第10期1575-1579,共5页

摘　　要： 该文基于由电子科技大学提出的作为中国地面数字多媒体电视广播传输标准候选方案之一的SMCC+系统和OFDM系统,提出了一种在低信噪比下利用特殊构造的短PN序列进行快速精确的大范围频率同步的方法。经仿真证明,信噪比在-20 dB范围以上时,该法在AWGN,单抽头瑞利衰落信道和等值双径瑞利衰落信道环境纠正大范围频偏的性能比Tufvesson等人(1999)同类常规算法性能更优,从理论上而言,该算法可以估计1/2带宽范围内的频率偏移,显然,该算法优于常规同类算法。 This paper proposed a fast, simple, robust and precise scheme of frequency offset estimation within a great range with lower SNR in the context of the Synchronized Multi-Carrier CDMA plus (SMCC+) system, which is one of the candidate standard of digital terrestrial multimedia/TV broadcasting transmission in China, and COFDM systems based on short Pseudo Noise sequence (PN-sequence) reconstructed by a special method. Computer simulation results show the proposed technique get better properties than the conventional synchronization techniques in AWGN, one- and two-tap Rayleigh fading channels even with lower SNR over -20dB. In addition, the estimation range of frequency offset could be widened to half bandwidth. Obviously, the proposed scheme is much better than the conventional frequency synchronization method.

关 键 词： 系统 频率同步 低信噪比

领　　域： [电子电信] [电子电信]