An Adaptive Modulation Precoding Scheme for Mean Ber Minimisation of ISI MIMO Channels

This paper considers a non-linear precoding scheme with adaptive bit loading in order to minimise the average BER for a given target data rate when transmitting over a Frequency Selective (FS) Multiple-Input Multiple Output (MIMO) channel. The proposed design utilises a recently developed polynomial singular value decomposition (PSVD) to decouple the FS MIMO channel into a number of independent FS Single Input Single Output (SISO) subchannels, whereby spectral majorisation inherent on the PSVD leads to a natural ordering of channel gains. The paper is exploited to adaptively allocate the transmission bits to the resulting FS SISO subchannels according to their SNRs.