System and method for processing a frequency division multiplexing signal

A method for processing a frequency division multiplexing signal transmitted in a channel, comprising steps of:

• a) receiving the frequency division multiplexing signal having a residual intercarrier interference (ICI) and a channel noise and transmitted in plural subcarriers;
• b) performing a cyclic prefix removal and a discrete Fourier transform for the frequency division multiplexing signal to obtain a frequency-domain signal;
• c) analyzing the frequency-domain signal to obtain a plurality of correlation values for the residual ICI and the channel noise;
• d) performing a communication signal processing for the frequency division multiplexing signal based on at least one of the plural correlation values;
• and
• e) performing a signal detection method for the frequency-domain signal, wherein the signal detection method includes a maximum likelihood sequence estimation, and the maximum likelihood sequence estimation is performed based on a sum-form log-likelihood function.