Spread-spectrum-signal reception apparatus and spread code initialization method

A spread code initialization method performed by a controller and a signal processor included in a spectrum-spread-signal reception apparatus to receive a signal having a spectrum spread with a spread code, the spread code initialization method comprising:

• obtaining by the controller of a phase comparison value that is a phase of the spread code at a time at which initialization of the phase of the spread code is preformed and which corresponds to a timing of a top of a frame of the signal;
• determining by the controller that a current time is within a range of a time window defined with respect to the time at which the initialization is performed;
• outputting by the controller of an initialization instruction including the phase comparison value when a current time is within the range of the time window;
• demodulating the signal received by the signal processor in accordance with the spread code and performing a frame synchronizing process with respect to the demodulated signal to detect a frame timing corresponding to a top of a frame of the received signal;
• receiving by the signal processor of an input of the initialization instruction;
• and
• performing by the signal processor of the initialization at a timing determined in accordance with a result of comparison between the phase comparison value included in the initialization instruction and a phase of the spread code at the frame timing.