Patent ID: 6940892

Claim:
A spread spectrum transmission apparatus comprising: a chip clock generation unit which outputs a chip clock having a clock rate corresponding to a chip rate in one frame formed of M+L−1 chips, the M+L−1 being determined by a pseudonoise code sequence having a period of L chips and M chips which represents a number of pulse position information pieces corresponding to an information content to be transmitted, a frame clock generation unit which conducts frequency division on the chip clock output by the chip clock generation unit by a factor of M+L−1, and outputs a frame clock synchronized to frame occurrence timing; N (where N is an integer of 2 or greater) spread spectrum pulse position modulated signal generation units each of which inserts the pseudonoise code sequence corresponding to one period from some of the M chips located at a head of a frame based on K-bit (where K is an integer of 2 or greater) transmission data by taking a rising edge of the frame clock output by the frame clock generation unit as a reference, and generates a spread spectrum pulse position modulated signal; N delay units which delay outputs respectively of the N spread spectrum pulse position modulated signal generation units by determined delay quantities {τ 1 T c , τ 2 T c , τ 3 T c , . . . , τ N T c } (where delay factors {τ 1 , τ 2 , τ 3 , . . . , τ N } are integers which satisfy 0≦τ 1 , τ 2 , τ 3 , . . . , τ N <L, and T c is a chip period); and a multiplexing unit which adds up all of outputs respectively of the N delay units, and generates multiplexed spread spectrum pulse position modulated signal.