Patent ID: 7302231

Claim:
A method of obtaining an estimate of a transmission channel at a receiver, the method comprising: a) receiving input signals from a plurality of receive antennas, said input signals being based upon a predetermined training sequence which has been transmitted to said receiver; b) determining a first estimate of said transmission channel, based upon said input signals and said predetermined training sequence; c) carrying out co-channel interference cancellation on said input signals using said first transmission channel estimate to provide an intermediate signal; d) determining a second estimate of said transmission channel based upon said intermediate signal and said predetermined training sequence; e) carrying out inter-symbol interference cancellation on said intermediate signal using said second transmission channel estimate to provide an output signal; and f) producing a revised output signal by: i) revising said first transmission channel estimate based upon said input signals, said predetermined training sequence and said second channel estimate to provide a revised first transmission channel estimate; ii) carrying out co-channel interference cancellation on said input signals using said revised first transmission channel estimate to provide a revised intermediate signal; iii) revising said second transmission channel estimate based upon said revised intermediate signal, said predetermined training sequence and said second channel estimate to provide a revised second channel estimate; and iv) carrying out inter-symbol interference cancellation on said revised intermediate signal using said revised second transmission channel estimate to provide said revised output signal.