Patent ID: 6421369
Filing Date: 2002-07-16
Classification: H04B

Abstract:
A receiving method for spread spectrum signals includes receiving a plurality of spread spectrum signals transmitted by spectrum-diffusing a modulation signal through a plurality of transmission paths performing an inverse spectrum diffusion to said plurality of spread spectrum signals by using diffusion codes having different phases corresponding to respective receiving timings of the plurality of spread spectrum signals, and combining the inverse-spectrum-spread signals at a set timing to generate a demodulation signal, said receiving method for spread spectrum signals comprising the steps of:setting a predetermined detection phase range with a receiving timing of a spread spectrum signal having a highest correlation value with a diffusion code out of said plurality of spread spectrum signals that are received as a reference phase position; detecting said spread spectrum signals of which the correlation values with said diffusion codes are at least at a predetermined level out of said plurality of spread spectrum signals within said predetermined detection phase range; generating a demodulation signal from said spread spectrum signals having correlation values that exceed said predetermined level; repeating the steps of setting said predetermined detection phase range, detecting said spread spectrum signals, and generating said demodulation signal; and widening said predetermined detection phase range based on said reference phase position when said spread spectrum signals having the correlation values with said diffusion codes that exceed said predetermined level are not detected within said predetermined detection phase range.