Method and device for training an RF amplifier linearization device, and mobile terminal incorporating same

• US 7,680,209 B2
• Filed: 10/28/2003
• Issued: 03/16/2010
• Est. Priority Date: 11/05/2002
• Status: Expired due to Fees

• Current Assignee: Cassidian SAS (Airbus SE)
• Original Assignee: EADS Secure Networks
• Inventors: Checoury, Xavier, Touchais, Sandrine
• Primary Examiner(s): Ghebretinsae; Temesghen
• Application Number:
  US10/533,861
• Publication Number:
  US 20060013334A1
• Time in Patent Office: 2,331 Days
• Field of Search: 375/295, 375/296, 375/297, 375/146
• US Class Current: 375/296
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

a method whereby a linearization training sequence is designed to be transmitted by means of a radiofrequency transmitter incorporated in a mobile terminal or a base station of a radiocommunication system comprising a fixed network. The sequence is adapted for transmitting bursts in accordance with a specific frame structure. Besides, the sequence is included in a sequence of symbols further designed to enable the transmission chain parameters to be adjusted.

Claims

1. A method of training a device for linearizing a radiofrequency amplifier which is included within a radiofrequency transmitter of a first equipment of a radiocommunication system, which transmitter is adapted for transmitting bursts according to a determined frame structure, each burst comprising symbols belonging to a determined alphabet of symbols, the method comprising the steps consisting in:

a) generating a linearization training sequence comprising a determined number N of symbols, where N is a determined integer;

b) transmitting the linearization training sequence by means of the transmitter in at least certain of the bursts transmitted by the latter;

c) comparing the linearization training sequence transmitted with the linearization training sequence generated so as to train said linearization device,

wherein, in step b), the linearization training sequence is included in a sequence of symbols that is also further designed to allow the adjusting of at least one parameter of a radiofrequency receiver of a second equipment of the radiocommunication system with which said first item of equipment communicates.

2. The method of claim 1, wherein the sequence of symbols that is designed to allow the adjusting of at least one parameter of the radiofrequency receiver is a sequence of symbols that is designed to allow the dynamic control of the gain of a variable-gain amplifier of said radiofrequency receiver.

3. The method of claim 1, wherein the linearization training sequence occupies only a part of the burst in which it is transmitted.

4. The method of claim 3, wherein the linearization training sequence occupies around 5% of the duration of the burst in which it is transmitted.

5. The method of claim 1, wherein the linearization training sequence is transmitted at the start of the determined frame structure.

6. The method of claim 1, wherein the linearization training sequence is further transmitted during a change of logical channel, a change of frequency and/or a change of power rating of the first equipment.

7. The method of claim 1, wherein the sequence of symbols that is designed to allow the dynamic control of the transmission power of the first equipment comprises more than N symbols, and wherein said N symbols of the linearization training sequence are the symbols of the sequence of symbols that is designed to allow the dynamic control of the transmission power of the first equipment which are sent first.

8. A device for training a device for linearizing a radiofrequency amplifier which is included within a radiofrequency transmitter of a first equipment of a radiocommunication system, which transmitter is adapted for transmitting bursts according to a determined frame structure, each burst comprising symbols belonging to a determined alphabet of symbols, the device comprising:

a) means for generating a linearization training sequence comprising a determined number N of symbols, where N is a determined integer;

b) means for transmitting the linearization training sequence by means of the transmitter in at least certain of the bursts transmitted by the latter;

c) means for comparing the linearization training sequence transmitted with the linearization training sequence generated so as to train said linearization device,

wherein said linearization training sequence is included in a sequence of symbols that is also further designed to allow the adjusting of at least one parameter of a radiofrequency receiver of a second equipment of the radiocommunication system with which said first item of equipment communicates.

9. The device of claim 8, wherein the sequence of symbols that is designed to allow the adjusting of at least one parameter of the radiofrequency receiver is a sequence of symbols that is designed to allow the dynamic control of the gain of a variable-gain amplifier of said radiofrequency receiver.

10. The device of claim 8, wherein the linearization, training sequence occupies only a part of the burst in which it is transmitted.

11. The device of claim 10, wherein the linearization training sequence occupies around 5% of the duration of the burst in which it is transmitted.

12. The device of claim 8, wherein the means for transmitting are adapted for transmitting the linearization training sequence at the start of the determined frame structure.

13. The device of claim 8, wherein the means for transmitting are adapted for transmitting, moreover, the linearization training sequence during a change of logical channel, a change of frequency and/or a change of power rating of the first equipment.

14. The device of claim 8, wherein the sequence of symbols that is designed to allow the adjusting of parameters comprises more than N symbols, and wherein said N symbols of the linearization training sequence are the symbols of the sequence of symbols that is designed to allow the adjusting of parameters which are sent first.

15. A mobile terminal of a radiocommunication system, comprising a radiofrequency transmitter having a radiofrequency amplifier and a device for linearizing the radiofrequency amplifier, further comprising a device for training the linearization device as claimed in any one of claims 8.

16. A base station of a radiocommunication system comprising a radiofrequency transmitter having a radiofrequency amplifier and a device for linearizing the radiofrequency amplifier, further comprising a device for training the linearization device as claimed in any one of claims 8.