NOISE REDUCTION IN WIRELESS COMMUNICATION APPLICATIONS
A noise reduction system in a wireless communication network, including: two or more input antennas adapted to receive wireless signals; wherein each input antenna has a different receiving characteristic, so that the signals provided by the input antennas constitute a distinct combination of the received signals; a filter coupled to each of the input antennas except one, wherein the filter is adapted to estimate the correlation between the signal provided by its associated input antenna and the signal provided by the input antenna not coupled to a filter and mitigate a dominant component of the received signals responsive to the estimation; a summator that is adapted to combine the filtered signal and the signal provided by the input antenna not coupled to a filter and provide the result as feedback to the filter; and wherein the filtered signals from all the filters are combined to form an output signal.
1 . A noise reduction system in a wireless communication network, comprising:
two or more input antennas adapted to receive wireless signals; wherein each input antenna has a different receiving characteristic, so that the signals provided by the input antennas constitute a distinct combination of the received signals;
a filter coupled to each of the input antennas except one, wherein the filter is adapted to estimate the correlation between the signal provided by its associated input antenna and the signal provided by the input antenna not coupled to a filter and mitigate a dominant component of the received signals responsive to the estimation;
a summator that is adapted to combine the filtered signal and the signal provided by the input antenna not coupled to a filter and provide the result as feedback to the filter; and
wherein the filtered signals from all the filters are combined to form an output signal.
2 . A noise reduction system according to claim 1 , wherein all the signals provided by the input antennas are converted from analog to digital.
3 . A noise reduction system according to claim 1 , wherein only the signals provided by the input antennas that are coupled to a filter are converted from analog to digital.
4 . A noise reduction system according to claim 1 , wherein the filters are adaptive filters.
5 . A noise reduction system according to claim 1 , wherein the summator is an analog summator.
6 . A noise reduction system according to claim 1 , wherein the summator is a digital summator.
7 . A noise reduction system according to claim 1 , further comprising a signal generator adapted to provide a training signal for output from the noise reduction system.
8 . A noise reduction system according to claim 1 , further comprising a controllable switch to prevent output of the input signals from the noise reduction system.
9 . A noise reduction system according to claim 1 , wherein the output signal is transmitted wirelessly to a receiving device.
10 . A noise reduction system according to claim 1 , wherein the output signal is transmitted through a cable to a receiving device.
11 . A noise reduction system according to claim 1 , wherein the system is adapted to be trained to identify characteristics of a signal and then mitigate the identified signal from further received signals.
12 . A method of reducing transmission noise in a wireless communication network, comprising:
providing wireless signals using a device with two or more input antennas; wherein each input antenna has a different receiving characteristic, so that the signals provided by the input antennas constitute a distinct combination of the received signals;
coupling a filter to each of the input antennas except one;
estimating the correlation between the signal provided by its associated input antenna and the signal provided by the input antenna not coupled to a filter;
mitigating a dominant component of the received signals responsive to the estimation to form a filtered signal;
combining the filtered signal and the signal provided by the input antenna not coupled to a filter and provide the result as feedback to the filter; and
forming an output signal by combining the filtered signals from all the filters.