Radio with interference measurement during a blanking interval

• US 10,051,643 B2
• Filed: 05/15/2017
• Issued: 08/14/2018
• Est. Priority Date: 08/17/2011
• Status: Active Grant

• Current Assignee: COMS IP Holdings LLC
• Original Assignee: Skyline Partners Technology, LLC (COMSovereign Holding Corp.)
• Inventors: Negus, Kevin J., Ghosh, Sagnik, Varadarajan, Badri
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US15/595,172
• Publication Number:
  US 20170251484A1
• Time in Patent Office: 456 Days
• Field of Search: None
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0028 Variable division signaling therefor H04L5/0092
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 92/20 between access points

Abstract

A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use a combination of interference mitigation procedures across multiple of the frequency, time, spatial and cancellation domains. Such backhaul radios may communicate with each other to coordinate radio resource allocations such that accurate interference assessment and channel propagation characteristics assessment may be determined during normal operation.

Claims

1. A method for exchanging one or more data interface streams by a radio with one or more other radios comprising:

converting from a respective one of a plurality of receive RF signals within a receive frequency band to a respective one of a plurality of receive chain output signals, wherein each said respective one of the plurality of receive RF signals is characterized by a receive channel combination from amongst a plurality of possible receive channel combinations, each said receive channel combination comprising at least a receive channel center frequency from amongst one or more possible receive channel center frequencies and a receive channel bandwidth from amongst one or more possible receive channel bandwidths;

converting from a respective one of a plurality of transmit chain input signals to a respective one of a plurality of transmit RF signals within a transmit frequency band, wherein each said respective one of the plurality of transmit RF signals is characterized by a transmit channel combination from amongst a plurality of possible transmit channel combinations, each said transmit channel combination comprising at least a transmit channel center frequency from amongst one or more possible transmit channel center frequencies and a transmit channel bandwidth from amongst one or more possible transmit channel bandwidths;

determining a measure of interference associated with at least one or more receive channel combinations;

determining the measure of interference during a blanking interval in which the one or more other radios are assumed to substantially inhibit transmissions within at least one or more frequency channels corresponding to the at least one or more receive channel combinations;

determining or estimating one or more performance metrics associated with the at least one or more receive channel combinations, said determining or estimating of the one or more performance metrics being based at least upon the measure of interference; and

changing at least one or more of the plurality of receive RF signals from being characterized by a first receive channel combination to being characterized by a second receive channel combination, said changing being based at least upon an opportunity to improve at least one of the one or more performance metrics.

2. The method of claim 1, further comprising:

selectively passing RF signals within the receive frequency band and selectively passing RF signals within the transmit frequency band;

operating the radio over at least both of the transmit frequency band and the receive frequency band; and

transmitting and receiving coincident in time for at least a period of time.

3. The method of claim 2, further comprising:

selectively coupling certain of a plurality of directive gain antenna elements to certain of a plurality of receive RF chains according to a set of selective receive coupling settings;

wherein at least one receive channel combination further comprises at least one of a plurality of possible sets of selective receive coupling settings.

4. The method of claim 3, wherein the certain of the plurality of directive gain antenna elements that can be selectively coupled to the certain of the plurality of receive RF chains are arranged on a plurality of facets with one or more directive gain antenna elements per facet, and wherein each facet is oriented at a different azimuthal angle relative to at least one other facet.

5. The method of claim 2, wherein the period of time corresponds to at least a duplex time duration associated with a number of blocks within a superframe.

6. The method of claim 1, further comprising:

demodulating one or more of a plurality of receive symbol streams to produce one or more receive data interface streams; and

generating the plurality of receive symbol streams from at least two of the plurality of receive chain output signals.

7. The method of claim 1, further comprising producing an intermediate frequency (IF) signal.

8. The method of claim 1, wherein the measure of interference includes a determination of an energy in each of a plurality of frequency bins using a Discrete Fourier Transform or a Fast Fourier Transform.

9. The method of claim 1 wherein the blanking interval corresponds to a blanking time duration associated with a number of blocks within a superframe.

10. The method of claim 1, further comprising:

sending and receiving one or more control signals or frames to and from the one or more other radios in order to mutually arrange the blanking interval.

11. The method of claim 1, wherein the one or more performance metrics includes at least one of or a weighted combination of a plurality of a signal to interference plus noise ratio (SINR), a link throughput, a latency, a jitter or a frame loss rate.

12. The method of claim 1, further comprising:

changing from the first receive channel combination to the second receive channel combination at a superframe boundary mutually agreed upon by the radio and the one or more other radios.

13. The method of claim 1, further comprising:

determining a channel propagation characteristics assessment for a wireless link between the radio and at least one of the one or more other radios, said channel propagation characteristics assessment associated with at least one of the plurality of receive channel combinations.

14. The method of claim 13, wherein the determining or estimating of the one or more performance metrics is also based at least upon the channel propagation characteristics assessment.

15. The method of claim 14, wherein the one or more performance metrics includes at least one of a signal to interference plus noise ratio (SINR) or a link throughput, or a weighted combination of a signal to interference plus noise ratio (SINR) and a link throughput, or a weighted combination at least one of a signal to interference plus noise ratio (SINR) or a link throughput plus at least one of a latency, a jitter or a frame loss rate.

16. The method of claim 1, wherein at least one of the receive frequency band and the transmit frequency band comprises at least frequency spectrum from within the 5 GHz UNIT band.

17. The method of claim 1, further comprising:

substantially inhibiting transmissions within at least one or more transmit channel combinations during a transmit blanking interval in response to one or more control signals or frames from the one or more other radios.

18. The method of claim 17, wherein the transmit blanking interval corresponds to a blanking time duration for a number of blocks within a superframe.

19. The method of claim 18, wherein the transmit blanking interval also corresponds to a blanking time duration in which the radio is configured to substantially inhibit transmissions within the transmit frequency band.

20. The method of claim 1, wherein the blanking interval corresponds to a blanking time duration in which the one or more other radios are assumed to substantially inhibit transmissions within the receive frequency band.

21. The method of claim 1, wherein said respective one of the plurality of transmit chain input signals comprise digital baseband quadrature signals.

22. The method of claim 21, further comprising:

at least partially cancelling an interfering signal received at at least one of one or more adjunct antenna elements within at least one of a plurality of receive symbol streams, and wherein the determining or estimating of the one or more performance metrics is also based on an estimated improvement due to said at least partially cancelling.

23. The method of claim 22, further comprising:

utilizing at least one of the one or more adjunct antenna elements for Dynamic Frequency Selection (DFS).

24. The method of claim 23, further comprising:

arranging successive ones of the blanking interval so as to appear non-uniform or pseudo-random to a DFS radar detector.

25. The method of claim 1, wherein the receive frequency band and the transmit frequency band overlap in the frequency domain.