摘要
文中分析OFDM接收机设计中定时偏差、频率偏差、样值偏差和相位噪声对接收机性能的影响;介绍关键的同步算法,提出在精确定时同步中采用二次相关方法,有效抑制多经效应的影响方法;并且采用频率补偿技术,克服剩余频偏变化在0.5子载波附近时,同步性能恶化的问题,使剩余偏差变化范围为(-0.25,0.25)。
In this paper, the effects of relevant nonideal transmission conditions are thoroughly analyzed: symbol frame offset, carrier and sampling clock frequency offset and phase noise. Then the the primary algorithms are detailed. In fine--tim- ing synchronization, twice correlations are used to get the sharp peak for timing. In carrier frequency acquisition stage we use a fast compensation algorithm to combat the degradation of ±0.5 offset, and the remaining offset is about (-0.25,0.25).
出处
《电子测量技术》
2005年第2期57-58,共2页
Electronic Measurement Technology
