OFDM软件接收机的符号精确同步[技术文章]_老古开发网文章 时域上(FFT之前)的信号处理得到.由初步符号同步估计和采样频率偏差引起的残留定时误差,可以由FFT之后的时钟误差检测器(timingerrordetector,TED)得到,其误差估计值的整数部分用来控制FFT窗口位置,小数部分反馈到VCO用于调整采样频率和相位.
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For sampling synchronization, a full digital timing recovery loop with a new timing error detector which has constant detecting gain and larger working range is adopted. Besides, the loop bandwidth can be adjusted automatically to improve performance.
对于采样同步,采用了全数字定时恢复环路,提出了具有恒定增益和较大捕获范围的鉴相器,并通过自动调整环路带宽来提高环路性能。
参考来源 - DTMB接收机同步算法及其电路结构优化研究·2,447,543篇论文数据,部分数据来源于NoteExpress
The timing error detector and loop filter of HDPLL are all digitized, whereas the VCXO employs analog components.
HDPLL中定时误差检测器、环路滤波器是全数字的,而VCXO使用了模拟器件。
The loop is a second order phase lock loop, consisting of an interpolator, a timing error detector and a loop filter.
环路为反馈结构,包括插值器、时钟误差检测和环路滤波器三个部分。
Simulation results show that the new detector has a lower packet detect error rate and a higher symbol timing precision compared with the existing schemes.
仿真结果表明,与已有的分组检测算法相比,新方法具有更低的分组检测错误概率,同时也改善了符号精定时的精度。
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