H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 15/00 (2006.01) H01Q 3/26 (2006.01) H04B 1/12 (2006.01) H04B 1/52 (2006.01)
Patent
CA 2164456
Adaptive apparatus for eliminating interference from a received signal provided on a transmission line caused by radio transceivers includes a plurality of frequency tunable filters tuned to the operating frequency of a corresponding transmitter. The transmitter signal of each transmitter is provided to a corresponding filter. The filter eliminates the non-essential transmission of harmonics, intermodulation and wideband noise of the transmission signal. The adaptive apparatus includes a plurality of cancellation devices wherein each cancellation device receives a sample of each filtered transmission signal and the received signal. The received signal includes an error portion generated by the transmitters and a non-error portion corresponding to the signal received by the antenna. Each cancellation device compares the corresponding sampled transmission signal with the sample of the received signal. A cancellation signal is generated by the cancellation device that is substantially equal to and opposite in phase to the error portion of the receive signal. The cancellation signals are then combined and amplitude and phase adjusted so that they have substantially the same amplitude but are 180° out of phase with the error portion. The combined error signal is injected onto the transmission line and provided to each of the frequency tunable filters.
Bahu Mark B.
Brossard Guy R.
Talwar Ashok K.
American Nucleonics Corporation
Borden Ladner Gervais Llp
Thomson-Csf
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