Patent ID: 7711036

Claim:
A synchronous acquisition circuit comprising: a code generating circuit which generates a digital code sequence based on a radio communication signal, wherein the digital code sequence defines a plurality of spread spectrum codes, one of the spread spectrum codes corresponding to a preamble symbol; a plurality of correlation circuits, coupled to the code generating circuit, which respectively generate a plurality of correlation signals based on the spread spectrum codes of the digital code sequence; a detection circuit, coupled to one of the correlation circuits, which generates a detection signal in accordance with the correlation signal which corresponds to the preamble symbol; a demodulation circuit, coupled to the correlation circuits, which generates a demodulation signal based on the correlation signals and in accordance with a timing control signal; a timing control circuit, coupled to the detection circuit, which generates the timing control signal for the demodulation circuit in accordance with the detection signal and a correction signal; and a correction circuit, coupled between the demodulation circuit and the timing control circuit, which generates the correction signal based on the demodulation signal, wherein the timing control circuit generates a corrected timing control signal for the demodulation circuit based on the timing control signal and the correction signal, such that the demodulation signal corresponds to the preamble symbol, wherein the correction circuit checks whether the demodulation signal corresponds to the preamble symbol, and generates the correction signal when the demodulation signal does not correspond to the preamble symbol, and wherein the correction circuit generates a correction completion signal when the demodulation signal corresponds to the preamble symbol.