Patent ID: 8515293
Filing Date: 2013-08-20
Classification: H04B,H04L

Abstract:
1. A coherent receiver that receives a first transmission signal associated with a first transmission polarization, and a second transmission signal associated with a second transmission polarization, by way of a quadrature multiplexed signal formed by applying quadrature multiplexing to the first transmission polarization and the second transmission polarization, the receiver comprising: a detection unit that detects the first transmission polarization and the second transmission polarization according to prescribed first reception polarization and second reception polarization and obtains a first detected signal and a second detected signal; a quantization unit that quantizes the first detected signal and the second detected signal and obtains a first quantized signal and a second quantized signal; and a signal processing unit filtering the first quantized signal and the second quantized signal using a prescribed filtering control algorithm to form a first demodulated signal and a second demodulated signal respectively, adjusting filter coefficients of the filtering control algorithm according to the first quantized signal and the second quantized signal and the first demodulated signal and the second demodulated signal, and outputting the first demodulated signal and the second demodulated signal to a first output terminal and a second output terminal, respectively, wherein the filtering control algorithm comprises an algorithm for filtering with a matrix in which double-row double-column elements are used as the filter coefficients, and the signal processing unit adjusts the filter coefficients by performing switching on the elements of the matrix in accordance with an identification result which identifies whether or not at least one of the first demodulated signal and the second demodulated signal has a prescribed data series.