Zero division duplexing mimo radio with adaptable rf and/or baseband cancellation

Abstract

An intelligent backhaul radio is disclosed, which can operate by zero division duplexing for use in PTP or PMP topologies, providing for significant spectrum usage benefits among other benefits. Specific system architectures and structures to enable active cancellation of multiple transmit signals at multiple receivers within a MIMO radio are disclosed. Further disclosed aspects include the adaptive optimization of cancellation parameters or coefficients.

What is claimed is: 
     
         1 . A radio with adaptable radio frequency (RF) cancellation for reduction of one or more transmit signals at a receiver within the radio, said radio comprising:
 a plurality of transmit radio frequency (RF) chains, wherein each transmit RF chain is configured to convert from a respective one of a plurality of transmit chain input signals to a respective one of a plurality of transmit RF signals;   a plurality of adaptable RF transversal filter sets configured to convert one or more RF cancellation input signals derived from one or more of the plurality of transmit RF signals to a plurality of RF transmit cancellation signals, wherein each one of the plurality of adaptable RF transversal filter sets comprises:
 one or more adaptable RF transversal filters, wherein each adaptable RF transversal filter is configured to filter a respective one of the one or more RF cancellation input signals to provide a respective one of one or more adaptable RF transversal filtered signals; and 
 an RF filtered signal combiner configured to combine the one or more adaptable RF transversal filtered signals within each one of the plurality of adaptable RF transversal filter sets to produce one of the plurality of RF transmit cancellation signals; 
   a plurality of antenna elements, wherein each of a plurality of receive RF signals is derived from signals received from at least one of the plurality of antenna elements, wherein each of the plurality of receive RF signals comprises at least one or more transmitter related signals, and wherein each of the one or more transmitter related signals is derived from at least one of the plurality of transmit RF signals;   a plurality of RF cancellation combiners, wherein each RF cancellation combiner is configured to combine a respective one of at least one of the plurality of RF transmit cancellation signals with at least one of the plurality of RF receive signals to provide a respective one of a plurality of receive chain input signals; and   a plurality of receive radio frequency (RF) chains, wherein each receive RF chain is configured to convert from a respective one of the plurality of receive chain input signals to a respective one of a plurality of receive chain output signals;   wherein the radio is configured to adapt at least one of the one or more adaptable RF transversal filters to reduce a level of an interfering signal component within at least one of the plurality of receive chain output signals, wherein the interfering signal component is derived from at least one of the one or more transmitter related signals, and wherein the radio utilizes a metric that accounts for at least the interfering signal component.