Threshold detector for detecting synchronization signals at correlator output during packet acquisition

摘要

A threshold detector for detecting synchronization signals at correlator output during packet acquisition. An RF receiver converts RF signals into baseband signals. A matched filter correlator correlates samples of the baseband signals with predetermined synchronization signals, such as long sync symbols, and provides corresponding correlation samples. A long-term integrator integrates a first predetermined number of the correlation samples to provide a long term moving average and a short term integrator integrates a second predetermined number of the correlation samples to provide a short term moving average signal. The short term moving average signal is based on channel delay spread and the long term moving average tracks channel noise. A multiplier multiplies the long term moving average signal by a scale factor to generate a dynamic threshold. A detector detects a crossover between the short term moving average and the dynamic threshold to estimate timing of received synchronization signals.