Signal reception processing apparatus and method for processing received signal
AssigneeNEC Corporation
InventorTadashi KOGA
Life of this patent
Estimating the term…
Abstract
A signal reception processing apparatus includes a digital signal processing unit that calculates a first Q value based on distribution of the symbols of the demodulated signal and distance between the symbols of the demodulated signal, and an error correction unit that outputs corrected signal as a demodulation electric signal, and calculates a second Q value based on an error rate at the time of the correction, and a control unit that calculates a penalty that indicates degradation quantity of signal quality caused by a nonlinear optical effect of an optical fiber based on the first Q value and the second Q value.
Claims20
A signal reception processing apparatus comprising:
- a digital signal processing unit that demodulates symbols of a received signal based on a constellation of the inputted received signal and calculates a first Q value that indicates quality of the received signal based on distribution of the symbols of the demodulated signal and distance between the symbols of the demodulated signal;
- an error correction unit that performs a forward error correction for the demodulated signal, outputs the corrected signal as a demodulation electric signal, and calculates a second Q value that indicates quality of the received signal based on an error rate at the time of the forward error correction;
- and
- a control unit that calculates a penalty that indicates degradation quantity of signal quality caused by a nonlinear optical effect of an optical fiber based on the first Q value and the second Q value.
A method for processing a received signal, comprising:
- demodulating symbols of a received signal based on a constellation of the inputted received signal;
- calculating a first Q value that indicates quality of the received signal based on distribution of the symbols of the demodulated signal and a distance between the symbols of the demodulated signal;
- performing a forward error correction for the demodulated signal and outputting the corrected signal as a demodulation electric signal;
- calculating a second Q value that indicates quality of the received signal based on bit error rate at the time of the forward error correction;
- and
- calculating a penalty that indicates a degradation quantity of signal quality caused by a nonlinear optical effect of an optical fiber based on the first Q value and the second Q value.
A non-transitory computer readable recording medium storing a signal reception processing program that causes a computer of a signal reception processing apparatus to execute:
- a process of demodulating symbols of a received signal based on a constellation of the inputted received signal;
- a process of calculating the first Q value that indicates quality of the received signal based on distribution of the symbols of the demodulated signal and a distance between the symbols of the demodulated signal;
- a process of performing forward error correction for the demodulated signal and outputting the corrected signal as a demodulation electric signal;
- a process of calculating the second Q value that indicates quality of the received signal based on a bit error rate at the time of the front error correction;
- and
- a process of calculating a penalty that indicates degradation quantity of signal quality caused by a nonlinear optical effect of an optical fiber based on the first Q value and second Q value.
Dependencies are inferred from the claim text.