Methods and apparatuses for digital pre-distortion

Patent metadata

Field	Value
Publication number	US-10615754-B2
Application number	US-201816050740-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 10, 2017
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A method is provided. The method, comprises: power amplifying, with at least two parallel power amplifiers, at least two pre-distorted signals each corresponding to a unique transmit band, wherein each power amplifier operates in a unique transmit band; and pre-distorting, with a single pre-distortion system, at least two signals in different transmit bands, where the pre-distortion of each of the at least two signals is based upon a portion of a corresponding power amplified, pre-distorted signal, and where the pre-distortion diminishes certain IMD products in the corresponding power amplified, pre-distorted signal.

First claim

The invention claimed is:

1. A system, comprising:
a digital pre-distortion (DPD) system comprising an input configured to receive signals corresponding to at least two transmit bands, and an output;
a digital to analog converter comprising an input coupled to the output of the DPD system, and an output;
a first duplexer comprising a first port, a second port, and a third port, where the first port of the first duplexer is coupled to the output of the digital to analog converter;
a first power amplifier comprising an input coupled to the second port of the first duplexer, an output, and is configured to power amplify signals in a first transmit band;
a second power amplifier comprising an input coupled to the third port of the first duplexer, an output, and is configured to power amplify signals in a second transmit band;
a first coupler comprising a first port, a second port and a third port, where the first port of the first coupler is coupled to the output of the first power amplifier;
a second coupler comprising a first port, a second port and a third port, where the first port of the second coupler is coupled to the output of the second power amplifier;
a first analog to digital converter comprising an input coupled to the second port of the first coupler, and an output coupled to the DPD system; and
a second analog to digital converter comprising an input coupled to the second port of the second coupler, and an output coupled to the DPD system.

2. The system of claim 1 , wherein if the signals are digital baseband data, then the digital to analog converter comprises an up converter, and each of the first and second analog to digital converters comprise a down converter.

3. The system of claim 1 , further comprising:
a first receiver front end system comprising an input and an output; and
a second receiver front end system comprising an input and an output.

4. The system of claim 3 , further comprising:
a second duplexer comprising a first port, a second port, and a third port, where the first port of the second duplexer is coupled to the third port of the first coupler and the second port of the second duplexer is coupled to the third port of the second coupler;
a third duplexer comprising a first port, a second port, and a third port, where the first port of the third duplexer is coupled to an input of the first receiver front end system and the second port of the third duplexer is coupled to an input of the second receiver front end system;
a fourth duplexer comprising a first port, a second port, and a third port, where the first port of the fourth duplexer is coupled to the third port of the second duplexer and the second port of the fourth duplexer is coupled to the third port of the third duplexer; and
an antenna coupled to the third port of the fourth duplexer.

5. The system of claim 1 , wherein the DPD system is configured to skew a center frequency of a bandwidth in which pre-distortion is performed and corresponding to one of the at least two transmit bands so that a pre-distortion bandwidth covers corresponding uplink and downlink bands.

6. The system of claim 5 , wherein the center frequency is equidistant from center frequencies corresponding to the downlink band, and its corresponding uplink band.

7. A system, comprising:
a digital pre-distortion (DPD) system comprising an input configured to receive signals corresponding to at least two transmit bands, and an output;
a digital to analog converter comprising an input coupled to the output of the DPD system, and an output;
a first duplexer comprising a first port, a second port, and a third port, where the first port of the first duplexer is coupled to the output of the digital to analog converter;
a first power amplifier comprising an input coupled to the second port of the duplexer, an output, and is configured to power amplify signals in a first transmit band;
a second power amplifier comprising an input coupled to the third port of the duplexer, an output, and is configured to power amplify signals in a second transmit band;
a first coupler comprising a first port, a second port and a third port, where the first port of the first coupler is coupled to the output of the first power amplifier;
a second coupler comprising a first port, a second port and a third port, where the first port of the second coupler is coupled to the output of the second power amplifier;
a switch comprising a first input port coupled to the second port of the first coupler, a second input port coupled to the second port of the second coupler, a common port, and at least one control port configured to select an input port of the switch; and
an analog to digital converter comprising an input coupled to the common port of the switch, and an output coupled to the DPD system.

8. The system of claim 7 , wherein if the signals are digital baseband data, then the digital to analog converter comprises an up converter, and the analog to digital converter comprises a down converter.

9. The system of claim 7 , further comprising:
a first receiver front end system comprising an input and an output; and
a second receiver front end system comprising an input and an output.

10. The system of claim 9 , further comprising:
a second duplexer comprising a first port, a second port, and a third port, where the first port of the second duplexer is coupled to the third port of the first coupler and the second port of the second duplexer is coupled to the third port of the second coupler;
a third duplexer comprising a first port, a second port, and a third port, where the first port of the third duplexer is coupled to an input of the first receiver front end system and the second port of the third duplexer is coupled to an input of the second receiver front end system;
a fourth duplexer comprising a first port, a second port, and a third port, where the first port of the fourth duplexer is coupled to the third port of the second duplexer and the second port of the fourth duplexer is coupled to the third port of the third duplexer; and
an antenna coupled to the third port of the fourth duplexer.

11. The system of claim 7 , wherein the switch has a third port; and
the system further comprises:
a first receiver front end system comprising an input and an output, where the output of the first receiver is coupled to the third port of the switch; and
a second receiver front end system comprising an input and an output.

12. The system of claim 11 , further comprising a multiplexer comprising an input, a first output, a second output, and at least one control input, where the input of the multiplexer is coupled to the output of the analog to digital converter, and where the first output of the multiplexer is coupled to the DPD system.

13. The system of claim 11 , comprising:
a second duplexer comprising a first port, a second port, and a third port, where the first port of the second duplexer is coupled to the third port of the first coupler and an input of a second receiver front end system;
a combiner system comprising a first port, a second port, and a third port, where the first port of the combiner is coupled to an input of the first receiver front end system and the second port of the combiner is coupled to the third port of the second coupler;
a third duplexer comprising a first port, a second port, and a third port, where the first port of the third duplexer is coupled to the third port of the second duplexer and the second port of the third duplexer is coupled to the third port of the combiner system; and
an antenna coupled to the third port of the third duplexer.

Assignees

• Commscope Technologies Llc

Inventors

• Braun Patrick
• Stefanik Joerg
• Dokni Mohammed
• Schmid Peter
• Friedrich Rainer

Classifications

• H03F3/189

  High-frequency amplifiers, e.g. radio frequency amplifiers · CPC title

• H03F2203/7209

  the gated amplifier being switched from a first band to a second band · CPC title

• H03F2200/111

  the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not · CPC title

• H03F3/72

  Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal · CPC title

• H04J3/047

  Distributors with transistors or integrated circuits · CPC title