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differential encoding and decoding cooperative communications compressed sensing distributed space-time coding sub-nyquist sampling ofdm spectrum sensing wideband signals synchronization errors channel fading non-coherent detection wireless communications cooperative wireless communications time-varying channels differential modulation multiple-symbol differential detection. distributed space-time code two-symbol detection time-varying fading channels multiple-symbol detection. differential m-psk dual-hop relaying channel variation auto-regressive models fast-fading channels multi-band signals sparse signals multi-coset sampling sub-nyquist non-linear least-squared cognitive radios cognitive radio sparse sampling deep learning machine learning lv segmentation cardiac mri rv relay networks frequency-selective channels space-time coding cooperative networks coherent detection