首页>
外国专利>
SYMBOL SYNCHRONIZER USING MODIFIED EARLY/PUNCTUAL/LATE GATE TECHNIQUE
SYMBOL SYNCHRONIZER USING MODIFIED EARLY/PUNCTUAL/LATE GATE TECHNIQUE
展开▼
机译:使用改进的早期/点末/后期门技术的符号同步器
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method and apparatus for synchronizing symbol timing for a QPSK demodulator. A matched filter pair outputs respective 'early-punctual-late' signals. The early and late signals are input to a symbol synchronizing estimator that produces an interpolation control signal used by the filters to synchronize the symbol timing to the sample timing. The punctual signal is output as an information bearing signal representing the received inphase and quadrature signals. The matched filters are interpolating matched filters. The symbol synchronizing estimator normalizes the early and late signals in a manner that allow the demodulator to 'flywheel' over signals having a low signal to noise ratio below a predetermined threshold.
展开▼