Zte Corporation

Xin Xiao

Jianjun Yu

Yuanquan Wang

A channel estimation technique suitable for implementation at a digital communication receiver such as an optical signal receiver apparatus includes receiving, over a communication channel, a transmission comprising a sequence of modulated symbols, estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel and selectively revising the estimated values of channel transfer function by reducing glitches in the estimated values of the channel transfer function.

Channel estimation using intra-symbol frequency domain averaging

Techniques for receiving a modulated optical signal which has undergone a digital Fourier transform spreading (DFTS), include generating digital samples of the modulated optical signal, performing resampling and synchronization of the digital samples to generate time-corrected digital samples from an input wireless signal, compensating the time-corrected digital samples for nonlinearity (NL) to produce NL-compensated digital samples, de-spreading the NL-compensated digital samples using an inverse digital Fourier transform to recover quadrature amplitude modulation (QAM) modulated signals, applying post-equalization to the QAM signals to generate equalized QAM signals, performing a decision directed least mean square (DD-LMS) equalization to generate blind-optimized QAM signals and demodulating the blind-optimized QAM signals to recover data bits.

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Parsippany, NJ, United States of America

Xin Xiao