Interference Reduction for Multiple Signals

摘要

The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal. All received signals are coupled to the same adaptive array or adaptive filter to reduce multipath or other shared interference of the first radio signal, which reduces multipath and other shared interference in the other radio signals before they are separated and processed by their respective receivers, or the individual radio signals are separated before the first signal enters the adaptive array and coupled to a slave weighting network slaved to the weights of the adaptive array of the first signal to reduce interference in all the signals.

主权项

1. A method for use in an adaptive array, said method comprising:
a) generating, for each one of N input signals, a first separated signal and a second separated signal representing an at least one first signal and an at least one second signal respectively of a received signal, said N input signals being derived from said received signal, said received signal was transmitted from a transmit antenna, said transmitted signal was formed by transmitting said at least one first signal and said at least one second signal that i) are in a common frequency channel and ii) are other than spread spectrum signals, wherein said at least one first signal and said at least one second signal arrive at said adaptive array with substantially the same relative characteristics to each other as when transmitted, wherein N is at least 2, b) generating a first adder output signal that is a function of the sum of the products of i) each representation of said first separated signal of each of said N input signals with ii) a respective one of a plurality of first weights associated with that said representation of that said first separated signal, said plurality of first weights being determined in such a way as to reduce associated interference in a particular type of signal that said adaptive array was designed to process, and c) generating a second adder output signal that is a function of the sum of the products of i) each representation of said second separated signal of each of said N input signals with ii) a respective one of a plurality of second weights associated with that said representation of that said second separated signal, each one of said plurality of second weights is derived from at least the associated one of said plurality of first weights.