Method for a Canceling Self Interference Signal Using Active Noise Cancellation in RF Circuits and Transmission Lines for Full Duplex Simultaneous (In Time) and Overlapping (In Space) Wireless Transmission & Reception on the Same Frequency band
a self-interference signal and active noise cancellation technology, applied in the field of cellular basestations, can solve the problems of inability to accurately recreate the signal intended to be received at the receiver, lack of availability of practical designs rather than inherent physical limitations, and inability to achieve the effect of re-creation or very difficult problems
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[0039]The present invention is directed to method for a four-layer approach in order to enable full duplex operation at a terminal. It is noted that in the discussion below, reference to the self interference caused by local transmission as “noise” or sometimes as “interference” both mean the same. The four layer approach encompasses the following:[0040]1. Active noise cancelation in the air by generating active interfering signal to combat the effect of interference signal.[0041]2. Active noise cancelation in RF circuits and transmission lines, e.g., waveguides.[0042]3. Passive noise cancelation with analog noise canceller circuits.[0043]4. Passive noise cancelation with digital noise canceller algorithms.
[0044]The first layer is based on a technique where an active source is added to the system which destructively interferes with the locally transmitted self interference signals at the receive antennas in order to cancel the self interference signal while leaving the received sign...
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