Adapter and Associated Method for Full-Duplex Wireless Communication

• US 20180070394A1
• Filed: 11/13/2017
• Published: 03/08/2018
• Est. Priority Date: 01/30/2014
• Status: Active Grant

• Current Assignee: Amir Keyvan Khandani
• Original Assignee: Amir Keyvan Khandani
• Inventors: Khandani, Amir Keyvan
• Granted Patent: US 10,334,637 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04W 76/10 Connection setup

Abstract

An apparatus is described, along with methods, the apparatus including a half-duplex transceiver including one or more half-duplex antenna terminals, a full-duplex transceiver including one or more full-duplex antennas, and an interface coupled between the half-duplex transceiver and the full duplex transceiver, the interface enabling the one or more half-duplex antenna terminals and the one or more full-duplex antennas to send and receive radio-frequency (RF) signals over a same frequency band simultaneously.

Claims

1. An apparatus comprising:

a half-duplex transceiver including one or more half-duplex antenna terminals;

a full-duplex transceiver including one or more full-duplex antennas; and

an interface coupled between the half-duplex transceiver and the full duplex transceiver, the interface enabling the one or more half-duplex antenna terminals and the one or more full-duplex antennas to send and receive radio-frequency (RF) signals over a same frequency band simultaneously.

2. The apparatus of claim 1 wherein the half-duplex transceiver includes a base-band signal generator and a radio frequency generator.

3. The apparatus of claim 1, wherein the interface includes one or more of:

an RF self-interference cancellation component;

an intermediate frequency (IF) self-interference cancellation component; and

a baseband (BB) self-interference cancellation component.

4. The apparatus of claim 3, wherein each of the RF self-interference cancellation component, the IF self-cancellation component, and the BB self-interference cancellation component include:

a plurality of nested stages to enable self-cancellation, the plurality of nested stages hierarchically nested to enable ordered training.

5. The apparatus of claim 4, wherein the plurality of nested stages enable ordered training via a training signal transmitted during a silent period during which no transmission is received from a distant node, the training signal configured to identify one or more self-interference channels.

6. The apparatus of claim 4, wherein the plurality of nested stages enable ordered training via a training signal transmitted by superimposing on the outgoing signal(s), the training signal configured to identify one or more self-interference channels.

7. The apparatus of claims 5 and 6, wherein the plurality of nested stages are trained via application of one or more results of a prior higher order stage to be applied and kept fixed during training of a next lower order stage, wherein each stage is ordered from a higher RF stage to a digital BB stage.

8. The apparatus of claim 1 wherein the interface includes:

an RF front end component, the RF front end component including;

an RF demodulator component to process BB signals;

a measurement component coupled to the RF demodulator component to measure self-interference;

a modeling component coupled to the measurement component, the modeling component to determine a self-interference cancellation model for incoming and outgoing signals related to the half-duplex and full-duplex transceivers.

9. The apparatus of claim 8 wherein the RF front-end component further includes:

an RF modulator component to modulate incoming and outgoing signals based on results from the modeling component.

10. The apparatus of claim 9 wherein the RF modulator component further includes:

a shifter to alter one or more carrier frequencies to combine at least two non-overlapping frequency division duplex frequency bands into a single band for full-duplex simultaneous transmission and reception.

11. The apparatus of claim 1 wherein the interface includes:

one or more RF filter banks, each of the one or more RF filter banks including one or more tunable phase and magnitude elements capable of feed-forward injection of a corrective signal for self-interference cancellation for injection into a receive path.

12. The apparatus of claim 11 wherein each of the one or more RF filter banks receive a signal extracted from a transmit path of one or more of the full-duplex transceiver and the half-duplex transceiver.

13. The apparatus of claim 11 wherein at least one of the one or more RF filter banks include:

a plurality of tunable delay elements;

a plurality of phase and/or magnitude tuning elements coupled to the plurality of tunable delay elements; and

a filter path coupled between the one or more RF filter banks and adjust the signal extracted from the transmit path.

14. The apparatus of claim 11 wherein the interface includes:

at least one low-noise amplifier (LNA) coupled to at least one of the one or more RF filter banks, the LNA amplifying and isolating in the receive path between one or more stages of the corrective signal.

15. The apparatus of claim 14 wherein the at least one LNA includes a plurality of LNAs wherein a gain of each of the plurality of LNAs is increased after a prior RF filter bank performs self-interference cancellation.

16. The apparatus of claim 11 wherein the one or more RF filter banks include:

a first RF filter bank;

a second RF filter bank isolated from the first RF filter bank;

wherein each of the first RF filter bank and the second RF filter bank provide RF self-interference cancellation, and either of the first RF filter bank and the second RF filter bank can provide the corrective signal for self-interference cancellation for injection into the receive path.

17. The apparatus of claim 11 wherein the one or more RF filter banks include one or more of:

one or more frequency selective filters;

a pool of RF filters having a plurality of frequency and delay characteristics, the pool of RF filter including a plurality of switches and a plurality of tuning elements to enable alteration of phase and magnitude for tuning.

18. The apparatus of above claims wherein the training signal is superimposed on an outgoing signal.

19. The apparatus of claim 1 wherein the half-duplex transceiver and the full-duplex transceiver are configured for Multiple-Input Multiple-Output (MIMO) transmit and receive operations.

20. A method comprising:

receiving, at an interface, an outbound radio-frequency (RF) signal from a half-duplex transceiver;

receiving a first inbound RF signal from a full-duplex transceiver, wherein the inbound radio frequency signal includes a self-interference component and a desired radio frequency component;

generating a corrective signal;

combining the corrective signal with the first inbound RF signal to generate a second inbound RF signal with reduced self-interference;

shifting the frequency of at least one of the received outbound RF signals and the second inbound RF signal; and

transmitting the outbound radio-frequency signal at the same frequency as the desired radio-frequency component.

21. The method of claim 20, wherein generating the corrective signal comprises:

sampling the outbound radio-frequency signal; and

adjusting the phase and amplitude of the sampled outbound radio-frequency signal to generate the corrective signal.

22. The method of claim 20, wherein the interface includes:

one or more RF filter banks, each of the one or more RF filter banks including one or more tunable phase and magnitude elements and one or more tunable delay elements capable of feed-forward injection of a corrective signal for self-interference cancellation for injection into a receive path.