In one of its aspects the technology disclosed herein concerns a method of operating a receiver. The method comprises performing symbol detection by (1) receiving a frequency-domain signal that comprises contribution from time-domain symbols transmitted from one or more transmit antennas; (2) generating a transformation matrix and a triangular matrix based on a frequency domain channel response; (3) using the transformation matrix to transform the received frequency-domain signal to obtain a transformed frequency-domain signal; and (4) performing symbol detection by performing plural stages of detection, each stage of detection using elements of the transformed frequency-domain received signal associated with the detection stage.