US 4,733,402 A · Adaptive filter equalizer systems

Abstract

An adaptive filter (11) for use in a diversity receiver system (10) which includes circuitry (23, 24, 25, 26, 34) for determining the strongest received diversity signal or group of signals at each of a plurality of time delays or group of time delays and circuitry (27, 28, 29, 30, 31, 34) for calculating a weighting signal and for weighting only the strongest received diversity signal or group of signals at each of the time delays or group of time delays, the other received diversity signals at each time delay thereby being in effect weighted by zero. The weighted signals are then combined in a delay line (32, 33) having a plurality of taps at such time delays to produce an output receiver signal. In a particular embodiment, for example, the received signals are complex signals and the weights used for the strongest received diversity signal at each time delay are quantized weights selected from the group .+-.1.+-.j.

Claims12

Dependent claims

A communications receiver system for receiving message signals transmitted through a multipath medium, said system comprising

a plurality of diversity receivers each receiving one of a plurality of received diversity message signals from a message signal transmitted through said medium;
a plurality of switching means each associated with a different received signal time delay and responsive to said plurality of received diversity message signals for providing as a switching output signal therefrom the strongest signal or group of signals of said plurality of received diversity message signals at said associated time delay;
a plurality of weighting means each responsive to the switching output signal from a corresponding one of said switching means and to a weighting signal for providing a weighted output signal;
means for providing a said weighting signal to each of said weighting means;
and
output time delay means responsive to the weighted output signals from said weighting means at each said associated time delay for combining said weighted output signals to provide a received output message signal therefrom.

3 more elements

Dependencies are inferred from the claim text.

Adaptive filter equalizer systems

Life of this patent

Adaptive filter equalizer systems

Life of this patent

Abstract

Claims12