Interference Reduction of 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 filter, the method comprising:
a) generating, for an input signal, a plurality of shifted output signals, the shifted output signals including respective different time delay shifts, each time delay shift being at least zero, the input signal being derived from K received signals that were each transmitted separately from a different one of K transmit antennas at a common transmitter end, each of the K transmitted signals having been formed by transmitting a different representation of a common signal in a common frequency channel, the common signal being made up of an at least one first signal and an at least one second signal, the K transmitted signals being other than spread spectrum signals, wherein K is at least 1, and b) generating an adder output signal that is a function of the sum of the products of i) each of the shifted output signals with ii) a respective one of a plurality of weights associated with that shifted output signal, the plurality of weights being determined in such a way as to reduce interference in a particular type of signal that the adaptive filter was designed to process.