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In this letter, we address the design of fractionally spaced adaptive equalizers when the input signal is sampled with noninteger, subsymbol sampling. We consider the problem of joint equalization and sample rate conversion and derive a stochastic gradient-based weight update algorithm for the equalizer. This enables us to decouple the equalization of channel impairments from that of fixed (periodic)...
Adaptive channel estimation methods are proposed for reduced guard-interval (RGI) CO-OFDM. Channel estimation is updated adaptively after decoding a sequence of OFDM symbols using LS or MMSE decision-feedback from demodulator to channel estimator.
A novel noise whitening method for compensating the performance loss due to spatially-colored noise in the presence of polarization-dependent impairments is proposed. The proposed algorithm is general for all single carrier, WDM, and OFDM systems.
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