SYSTEM AND METHOD FOR ENHANCED TRANSMITTER EFFICIENCY

• US 20170135058A1
• Filed: 10/03/2016
• Published: 05/11/2017
• Est. Priority Date: 02/25/2014
• Status: Active Grant

• Current Assignee: Fadhel M Ghannouchi
• Original Assignee: Fadhel M Ghannouchi
• Inventors: Ghannouchi, Fadhel M., VEJDANIAMIRI, Mehdi, Helaoui, Mohamed
• Granted Patent: US 10,313,996 B2
• Time in Patent Office: Days
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 2001/0408 with power amplifiers
• CPC Class Codes: H04B 2001/045 with means for improving efficiency
• CPC Class Codes: H04L 25/03012 operating in the time domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 27/08 Amplitude regulation arrangements
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/368 adaptive predistortion
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for distortion compensation in a transmission link comprising obtaining information of an amplitude distribution of a signal prior to being transmitted by a transmitter, receiving the transmitted signal at a receiver and determining a received signal amplitude distribution, comparing the received signal amplitude distribution to the amplitude distribution of the signal prior to transmission and using results of the comparison to estimate the AM/AM non-linearity in the transmitter.

Claims

1. A method for distortion compensation in a transmission link comprising:

obtaining information of a signal transmitted by a transmitter;

receiving the transmitted signal at a receiver;

comparing the received signal to the signal transmitted prior to transmission; and

using results of the comparison to post-compensate at the receiver for linear and non-linear distortions in the transmission link.

5. The method of claim 1, wherein the receiver is a mobile device.

6. The method of claim 1, wherein the receiver is a base station.

7. The method of claim 1, wherein the transmission link is a downlink between an electronic device and a base station.

8. The method of claim 1, wherein the transmission link is an uplink between an electronic device and a base station.

9. The method of claim 1, further including:

obtaining phase information of the signal at an input and output of the transmitter before said transmission;

comparing the phase of the input and output of the transmitted signal;

using the comparison of the phases to estimate the AM/PM non-linearity in the transmitter, and

linearizing the transmitted signal using a phase-only predistortion at the transmitter.

14. The method of claim 1, further including implementing a phase-only predistortion at the transmitter prior to transmission of said signal.

2. A network element comprising:

a receiver for receiving a signal after transmission from a transmitter;

a processor configured to;

obtain information of a signal transmitted by a transmitter,

receive the transmitted signal at the receiver,

compare the received signal to the signal transmitted prior to transmission; and

use results of the comparison to post-compensate at the receiver for linear and non-linear distortions in the transmission link.

3. The network element of claim 2, wherein the network element is a mobile device.

4. The network element of claim 2, wherein the network element is a base station.

10. The network element of claim 2, furthermore comprises

a processor in the transmitter configured to:

obtain information of the signal at an input and output of the transmitter before being transmitted;

compare the signals at the input and output of the transmitter; and

use the comparison to pre-compensate at least partially for an AM/PM non-linearity in the transmitter.

11. The method of claim 10, the processor further configured to use the signal comparison to pre-compensate partially for the AM/AM non-linearity in the transmitter.

12. The method of claim 10, wherein the comparison is used to estimate the AM/PM non-linearity in the transmitter.

13. The method of claim 10, wherein the comparison is used to estimate the AM/AM non-linearity in the transmitter.

15. The network element of claim 2, wherein a phase-only predistortion of the signal prior to transmission is implemented.