Patent ID: 8867413
Filing Date: 2014-10-21
Classification: H04L

Abstract:
1. A method of pre-equalizing a data signal transmitted in frequency division duplex by an originating communicating entity having a set of originating antennas to a destination communicating entity having a set of destination antennas, the method comprising the steps of: receiving via a reference antenna of the set of originating antennas a first pilot sequence transmitted by a destination antenna through a first propagation channel, and estimating a first impulse response representative of said first propagation channel; receiving via the destination antenna a second pilot sequence transmitted by an originating antenna through a second propagation channel between said originating antenna and the destination antenna, and estimating a second impulse response representative of said second propagation channel; receiving, via the reference antenna, a third pilot sequence that is modulated by said second impulse response and transmitted by the destination antenna, and estimating a combined impulse response representative of said first and second propagation channels in succession; time reversing the combined impulse response; and combining the time-reversed combined impulse response and the first impulse response; said steps being re-iterated for at least a portion of the set of destination antennas and at least a portion of the set of originating antennas; and determining pre-equalization coefficients for the data signal from a set of said impulse response combinations.