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Iterative Frequency-Domain Equalization of Single-Carrier Transmissions over Doubly Dispersive Channels

Frequency-domain equalization (FDE) offers an attractive alternative to time-domain equalization in systems that communicate over large-delay-spread channels. Traditionally, FDE leverages the fact that time-domain convolution is equivalent to frequency-domain multiplication and the fact that time/frequency conversion is efficiently handled by the fast Fourier transform (FFT). In doubly dispersive channels, i.e., quickly varying large-delay-spread channels, the traditional FDE methods fail when the channel response varies significantly over the FFT analysis window. Here we present a new FDE that is based on Doppler channel shortening, soft iterative interference cancellation, and block decision feedback. Numerical simulations show that the proposed technique has advantages over the well-known FIR-MMSE-DFE in both performance and complexity.