Patent ID: 8111734
Filing Date: 2012-02-07
Classification: H04B

Abstract:
1. A device for fast transition from preamble synchronization of a received signal to demodulation of the received signal, comprising: a chip tracking loop to generate an offset tracking value to track any initial chip phase offset and Doppler-caused chip frequency drift associated with the received signal; a numerical controlled oscillator to correct any Doppler-caused phase rotation associated with the received signal; a preamble synchronization unit to detect a preamble of the received signal, and to measure a chip phase offset and a Doppler frequency shift associated with the received signal, wherein the chip phase offset is used to set an initial chip phase offset value of the chip tracking loop so that the chip tracking loop starts with approximately a zero pull-in error, and the Doppler frequency shift is used to set initial frequency offset values in the chip tracking loop and the numerical controlled oscillator so that both start with near-zero offset errors for demodulation of the received signal; and an output device to output the data demodulated from the received signal.