# US 2022/0286266 A1 · Zero division duplexing mimo radio with adaptable rf and/or baseband cancellation

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- Number: US 2022/0286266 A1
- Document ID: US20220286266A1
- Status: Published application
- Kind: A1
- Application number: 17/751,624
- Filed: 2022-05-23
- Published: 2022-09-08
- Earliest claimed: 2012-06-21
- Assignees: Skyline Partners Technology LLC
- Applicants: Skyline Partners Technology LLC
- Inventors: Kevin J. Negus; James A. Proctor, JR.
- Web page: https://patentgrep.com/patent/US20220286266A1

## CPC

- H04L 5/1423: {for simultaneous baseband signals}
- H01Q 21/062: {using dipole aerials; (H01Q21/067, H01Q21/068 take precedence)}
- H01Q 21/24: Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)}
- H01Q 21/28: Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)}
- H04B 1/38: Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H04B 1/54: using the same frequency for two directions of communication (H04B1/44 takes precedence)
- H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10)
- H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits}
- H04W 24/02: Arrangements for optimising operational condition
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## 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.

## Claims

### Claim 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.