Patent ID: 8645806
Filing Date: 2014-02-04
Classification: H04L

Abstract:
1. An optical receiving apparatus comprising: an analog-to-digital (A/D) converting circuit that converts a received analog signal to a received digital signal; a received-signal demodulating circuit that demodulates the received digital signal into an m-bit received signal; a soft-decision-data generating circuit that generates n-bit soft-decision data, which corresponds to a determination result according to 2 an error correcting circuit that performs error correction based on the n-bit soft-decision data and outputs an error-corrected received signal, wherein the soft-decision-data generating circuit sets a most significant bit (MSB) of the m-bit received signal as hard-decision data, creates reliability information, and generates the n-bit soft-decision data including the most significant bit and the reliability information, and p sequential bits extracted from m−k bits on a least significant bit (LSB) side of the m-bit received signal are set as the reliability information, where k bits are bits on a MSB side of the m-bit received signal, 2≦k≦m, p≦m−k, and p is a constant.