METHOD OF CODING SIGNAL FOR DIGITAL OPTICAL COMMUNICATION HAVING SPECTRUM WHICH ATTAINS ZERO LEVEL AT PRESCRIBED FREQUENCY WITHIN MAIN LOBE BAND, BASEBAND TRANSMITTER OR ASK TRANSMITTER USING SUCH METHOD, AND BASEBAND RECEIVER OR ASK RECEIVER DECODING SIGNAL CODED BY SUCH METHOD

摘要

A method of coding a signal for digital optical communication using a symbol formed of N slots [s1, s2, s3, . . . sN], wherein si is either 0 or 1 where i is an integer and l<=i <=N is provided. The method includes the steps of determining a plurality of symbols which satisfy the following expression, wherein k is an arbitrary positive integer, and p1, q1, p2, q2, . . . , pk and qk are integers which satisfy 1<=p1<q1, 1<=p2<q2, . . . , 1<=pk<qk, and p1/q1<p2/q2<. . . <pk/qk:and coding transmission data based on the determined plurality of symbols.