SPREAD SPECTRUM PULSE POSITION MODULATION COMMUNICATION METHOD SPREAD SPECTRUM PULSE POSITION MODULATION TRANSMITTER AND SPREAD SPECTRUM PULSE POSITION MODULATION RECEIVER

摘要

PROBLEM TO BE SOLVED: To attain high speed transmission equivalent to the case with using two pseudo noise series. SOLUTION: In this spread spectrum pulse position modulation communication method, a frame consisting of (M+L-1+j)-sets (j=0) is used, M-value of 1st data symbol and N-value (M=N) of 2nd data symbol are prepared, and the M-value of the 1st data symbol and Nvalue (M=N) of the 2nd data symbol are subject to differential coding to provide an output of the 1st and 2nd data symbols. Then based on the 1st and 2nd data symbols, one slot is selected from M-sets of consecutive slots in one frame. Then a pseudo noise series with the period L is inserted to the L slot in succession to slots selected from the M-sets of the slots to generate a 1st modulation signal, and an inverted series is inserted to the L slots in succession to slots selected from the M-sets of the slots to generate a 2nd modulation signal, and the 1st and 2nd modulation signals are added and the sum signal is transmitted.