  Quaternion-valued wireless communication systems have been studied in the
past. Although progress has been made in this promising area, a crucial missing
link is lack of effective and efficient quaternion-valued signal processing
algorithms for channel equalisation and beamforming. With most recent
developments in quaternion-valued signal processing, in this work, we fill the
gap to solve the problem and further derive the quaternion-valued Wiener
solution for block-based calculation.
