Patent ID: 7471716

Claim:
A device for spread spectrum communication comprising: a toggle detecting unit which detects a candidate of a toggle point existing in a carrier of a received signal by calculating correlation between the carrier of the received signal and a pre-held expected signal and then searching for positions of phase changing points expected to be in the received signal but whose positions are currently unknown, wherein the received signal is a modulated waveform of the carrier wave itself, and wherein the pre-held expected signal is a signal including a waveform of the toggle point which is expected to be in the carrier of the received signal and is a signal having a length corresponding to 2 chip-times of a spread code or is a signal having a shorter length than 2 chip-times of the spread code, and said 2 chip-times of the spread code being that portion of the expected signal extending from both sides of the toggle point a distance of 1 chip-time; and a demodulating unit which demodulates the received signal by multiplying the received signal by the spread code which is shifted according to a shift amount calculated based on the detected candidate.