SPREAD SPECTRUM COMMUNICATION METHOD

摘要

PURPOSE:To prevent saturation of a 1st stage amplifier by generating a PN arrangement code comprising noninverting and/or inverting pattern from a PN series code unit and allocating one or plural codes to each communication channel. CONSTITUTION:A transmitter T2 uses a multiplier 14 to modulate a series code by transmission data D and a multiplier 15 applies product modulation to a carrier by using a modulation signal to apply spread spectrum to the carrier and the result is sent to a receiver R2. On the other hand, a mixer 20 of the receiver R2 mixes the frequency of a signal from the sent spread spectrum signal via a filter 18 and an amplifier 19 with a local signal fL and converts the result into a spread signal of a base band through an LPF. Moreover, a multiplier 21 is used to take correlation between the series code and the spread signal at the base band and an output signal resulting from integrating the correlation signal at an integration device 22 is detected at a detector 23 at a final point of time of the frame of M series and the sent information data D are demodulated.