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. Apparatus for processing K received signals, the apparatus comprising:
a signal shifter for an input signal configured to generate one or more shifted output signals that are shifted versions of the input signal, the shifted output signals include respective time delay shifts or respective phase shifts, each time delay shift is at least zero, each phase shift magnitude is at least zero, the input signal is derived from the K received signals, K is at least 2, each of the K received signals was transmitted separately from a different one of K transmit antennas at a common transmitter end, each of the K transmitted signals were formed by transmitting a different representation of a common signal in a common frequency channel, the common signal is made up of an at least one first signal and an at least one second signal, and an at least one adder configured to generate an adder output signal that is a function of the sum of the products of i) each of the associated 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 apparatus was designed to process.