Reception of 2-subcarriers coherent orthogonal frequency division multiplexed signals

摘要

A dual-polarization, 2-subcarriers code orthogonal, orthogonal frequency division multiplexed signal carrying information bits is transmitted in an optical communication network without transmitting a corresponding pilot tone or training sequence. A receiver receives the transmitted signal and recovers information bits using a blind equalization technique and by equalizing the 2-subcarriers OFDM signal as a 9-QAM signal in time domain with a CMMA (constant multi modulus algorithm) equalization method.

主权项

1. A method for recovering information bits from a two-subcarrier orthogonal frequency division multiplexed (OFDM) signal in which each subcarrier is modulated using a 4 Quadrature Amplitude Modulation (QAM) constellation, comprising:
receiving the two-subcarrier OFDM signal; processing the two-subcarrier OFDM signal as a 9-QAM signal to generate a modulus signal; and applying a 2 point Fourier transform to the modulus signal to recover the information bits.