Patent ID: 6115419
Filing Date: 2000-09-05
Classification: H01Q,H04B,H04L,H04N

Abstract:
An apparatus for improving signal reception in a signal receiver having a first antenna and a second antenna comprising:a first feedforward equalizer circuit capable of being coupled to said first antenna, said first feedforward equalizer circuit comprising equalization circuitry capable of modifying a signal from said first antenna to correct distortions in said signal; anda second feedforward equalizer circuit capable of being coupled to said first antenna through a first .pi./2 phase shift circuit, said second feedforward equalizer circuit comprising equalization circuitry capable of modifying a signal from said first antenna to correct distortions in said signal; anda third feedforward equalizer circuit capable of being coupled to said second antenna, said second feedforward equalizer circuit comprising equalization circuitry capable of modifying a signal from said second antenna to correct distortions in said signal; anda fourth feedforward equalizer circuit capable of being coupled to said second antenna through a second .pi./2 phase shift circuit, said fourth feedforward equalizer circuit comprising equalization circuitry capable of modifying a signal from said second antenna to correct distortions in said signal;an adder having a first input coupled to said first feedforward equalizer circuit, a second input coupled to said second feedforward equalizer circuit, a third input coupled to said third feedforward equalizer circuit, and a fourth input coupled to said fourth feedforward equalizer circuit, wherein said adder is capable of adding said modified signal from said first feedforward equalizer circuit, said modified signal from said second feedforward equalizer circuit, said modified signal from said third feedforward equalizer circuit, and said modified signal from said fourth feedforward equalizer circuit; anda decision device coupled to an output of said adder and capable of monitoring a signal on said adder output, wherein said decision device, in response to a value of said adder output signal, modifies equalizer coefficients in said first feedforward equalizer circuit and said second feedforward equalizer circuit and said third feedforward equalizer circuit and said fourth feedforward equalizer circuit to reduce interference signals from at least one of said first feedforward equalizer circuit and said second feedforward equalizer circuit and said third feedforward equalizer circuit and said fourth feedforward equalizer circuit.