RADIO FREQUENCY TRANSMITTER NOISE CANCELLATION

摘要

The noise cancellation of a radio frequency transmitter can be applied on a channel as the basis of a channel to active channels of an incoming wireless frequency signal received at a receiver. A noise cancellation filter can be provided for each active channel in a predetermined signal band. Applying noise cancellation based on an active channel instead of a total receiving band can practically reduce the number of taps or filter coefficients and filtering requirement for reducing manufacturing costs and saving power. The noise cancellation devices of a channeled transmitter, the cross-linkage cancellation devices of multi transmitter-receivers, and the noise cancellation devices of a hybrid total signal band and channeled transmitter are also provided.