Digital full duplex over single channel solution for small cell backhaul applications

Patent metadata

Field	Value
Publication number	US-10244409-B2
Application number	US-201815888226-A
Country	US
Kind code	B2
Filing date	Feb 5, 2018
Priority date	Apr 6, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

To provide for higher data rates, a wireless back haul network for connecting small cell base stations to a core network can be implemented using full-duplex over single channel communications. The difficulty with full-duplex over single channel communications, and the reason why it has not become common place in wireless and mobile communication standards to date, is the significant interference that the receiver of a full-duplex communication device will generally experience from the full-duplex communication device's own transmitter transmitting over the same channel that the receiver is to receive signals. This interference is referred to as self-interference because the interference experienced by the receiver originates from its own paired transmitter. The present disclosure describes embodiments of an apparatus and method that provide sufficient self-interference cancellation in a compact and power efficient manner for a small cell wireless backhaul network.

First claim

What is claimed is:

1. A transceiver, comprising:
a transmitter operable to up-convert and amplify a transmit baseband signal to provide a transmit RF signal for a small cell base station;
a receiver operable to amplify and down-convert a receive RF signal to provide a receive baseband signal for the small cell base station, wherein the transmit RF signal is wirelessly transmitted over a same time and frequency band as the receive RF signal is wirelessly received; and
a baseband canceler configured to cancel self-interference from the transmit RF signal in the receive RF signal at baseband using a distorted copy of the transmit baseband signal.

2. The transceiver of claim 1 , wherein the baseband canceller is configured to generate the distorted copy of the transmit baseband signal based on a non-linear distortion associated with the up-conversion and the amplification performed by the transmitter.

3. The transceiver of claim 1 , wherein the baseband canceller is configured to cancel the self-interference from the transmit RF signal in the receive RF signal at baseband in the digital domain.

4. The transceiver of claim 1 , wherein the frequency band is 60 GHz.

5. The transceiver of claim 1 , wherein the frequency band is a millimeter radio band between 30 GHz and 300 GHz.

6. The transceiver of claim 1 , wherein the transmit RF signal is wirelessly transmitted to a macro base station, and the receive RF signal is wirelessly received from the macro base station.

7. The transceiver of claim 6 , wherein the macro cell base station has access to a core network via a wired connection.

8. The transceiver of claim 1 , wherein the transceiver is operable coupled to a directional antenna.

9. A transceiver for small cell backhaul applications, comprising:
a transmitter configured to up-convert and amplify a transmit baseband signal to provide a transmit RF signal;
a receiver configured to amplify and down-convert a receive RF signal to provide a receive baseband signal, wherein the transmit RF signal is wirelessly transmitted over a same time and frequency band as the receive RF signal is wirelessly received; and
a baseband canceller configured to cancel self-interference from the transmit RF signal in the receive RF signal at baseband based on a distorted copy of the transmit baseband signal, wherein no cancellation of the self-interference from the transmit RF signal in the receive RF signal is performed at RF.

10. The transceiver of claim 9 , wherein the baseband canceller is configured to generate the distorted copy of the transmit baseband signal based on non-linear distortions associated with the up-conversion and amplification performed by the transmitter on the transmit baseband signal.

11. The transceiver of claim 9 , wherein the baseband canceller is configured to cancel the self-interference from the transmit RF signal in the receive RF signal at baseband in the digital domain.

12. The transceiver of claim 9 , wherein the frequency band is 60 GHz.

13. The transceiver of claim 9 , wherein the frequency band is a millimeter radio band between 30 GHz and 300 GHz.

14. The transceiver of claim 9 , wherein the transmit RF signal is wirelessly transmitted to a macro base station, and the receive RF signal is wirelessly received from the macro base station.

15. The transceiver of claim 14 , wherein the macro cell base station has access to core network via a wired connection.

16. The transceiver of claim 9 , wherein the transceiver is operably coupled to a directional backhaul transmit antenna and a directional backhaul receive antenna.

Assignees

• Maxlinear Asia Singapore PTE LTD

Inventors

• Ridel Eran
• Soffer Ran
• Kanari Uri
• Levitan Evgeny
• Zalitzky Idan
• Bar Yaniv

Classifications

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title

• H04W84/045

  using private Base Stations, e.g. femto Base Stations, home Node B · CPC title

• H04W92/20

  between access points · CPC title

• Y02D70/40

  Cross-Sectional Technologies · mapped topic

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title