DOWNLINK SIGNAL TRANSMISSION METHOD IN STATION SIDE TERMINATING DEVICE, DOWNLINK SIGNAL RECEIVING METHOD IN SUBSCRIBER SIDE TERMINATING DEVICE, STATION SIDE TERMINATING DEVICE, SUBSCRIBER SIDE TERMINATING DEVICE, AND PASSIVE OPTICAL NETWORK SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide technology which, when amplitude modulation and phase modulation are performed in parallel on one and the same carrier signal, reduces the number of coded symbol errors for a phase modulated signal.;SOLUTION: In a coded symbol #2, signal points on the inside of a constellation are concentrated; in a coded symbol #1, however, signal points on the outside of the constellation are concentrated. Although a symbol error tends to occur in the coded symbol #2, a symbol error is less likely to occur in the coded symbol #1. Whether a symbol error can be corrected depends on the number of symbol errors, so that even when there is an increased number of bit errors in a coded symbol like the coded symbol #2, the number of symbol errors in a plurality of coded symbols such as the coded symbols #1, #2, and so on can be reduced by concentrating the bit errors, making it possible to correct symbol errors completely.;COPYRIGHT: (C)2014,JPO&INPIT