Patent ID: 7551701

Claim:
A method for training branch-specific prefilters in a receiver having at least two input branches, the input branches receiving branch-specific signals transmitted across communications channels, each branch-specific signal containing data from a target transmitter and possibly also interference, the method comprising: determining a conditioned channel as a linear predictive filter of a residual error between (i) an original signal before transmission across the communications channels; and (ii) a composite signal that combines the branch-specific received signals after transmission across the communications channels as filtered by one of a plurality of branch-specific equalizers, wherein the plurality of branch-specific equalizers collectively comprise an optimum space-time linear equalizer; determining a plurality of frequency responses of the communications channels from the transmitters to the input branches; computing a frequency-dependent signal-to-noise-plus-interference ratio (SNIR) from the plurality of frequency responses of the communications channels; inverse transforming a function of the frequency-dependent SNIR to obtain an autocorrelation function; computing an impulse response of the conditioned channel from the autocorrelation function; transforming the impulse response of the conditioned channel to obtain the frequency response of the conditioned channel; and computing frequency responses of the branch-specific prefilters from the frequency response of the conditioned channel.