A
system and method are described for compensating for frequency and phase offsets in a
multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training
signal from each antenna of a
base station to one or each of a plurality of
wireless client devices, one or each of the
client devices analyzing each training
signal to generate
frequency offset compensation data, and receiving the
frequency offset compensation data at the
base station; computing MU-MAS precoder weights based on the
frequency offset compensation data to pre-cancel the frequency offset at the
transmitter;
precoding training
signal using the MU-MAS precoder weights to generate precoded training signals for each antenna of the
base station; transmitting the precoded training signal from each antenna of a base
station to each of a plurality of
wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base
station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the MU-MAS precoder weights calculated to pre-cancel frequency and
phase offset and / or inter-user interference;
precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base
station; and transmitting the precoded data signals through each antenna of the base station to each respective client device.