METHOD FOR ADJUSTING A TRANSMIT POWER OF A MULTI CARRIER TRANSMITTER AND A MULTI CARRIER TRANSMITTER

• US 20140274191A1
• Filed: 03/14/2013
• Published: 09/18/2014
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Deutschland GmbH (Intel Corporation)
• Inventors: Brueckmann, Dieter, Scholand, Tobias, Speth, Michael
• Granted Patent: US 9,265,006 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/286 during data packet transmission, e.g. high speed packet access [HSPA]
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

A method for adjusting a transmit power of a multi carrier transmitter in a mobile communication system includes providing at least two data streams, each data stream to be transmitted on a separate carrier frequency, and determining a transmit signal adaptation metric separately for each of the at least two data streams. The method further includes calculating a combined transmit signal adaptation metric based on the separate transmit signal adaptation metrics, combining the two data streams carried on the two carrier frequencies to an overall transmit signal, and adjusting the transmit power of the overall transmit signal based on the calculated combined transmit signal adaptation metric.

Claims

1. A method for adjusting a transmit power of a multi carrier transmitter in a mobile communication system, comprising:

providing at least two data streams, wherein each data stream is configured to be transmitted on a separate carrier frequency;

determining a transmit signal adaptation metric separately for each of the at least two data streams;

calculating a combined transmit signal adaptation metric based on the separate transmit signal adaptation metrics;

combining the two data streams carried on the two separate carrier frequencies to an overall transmit signal; and

adjusting the transmit power of the overall transmit signal based on the calculated combined transmit signal adaptation metric.

2. The method of claim 1, further comprising:

determining the transmit signal adaptation metric for each of the at least two data streams based on signal statistics of the respective data stream.

3. The method of claim 1, further comprising:

determining the transmit signal adaptation metric for each of the at least two data streams based on a raw cubic metric.

4. The method of claim 3, further comprising:

determining the 4^th and 6^th moments for each of the at least two data streams.

5. The method of claim 4, wherein each of the at least two data streams comprises at least one data channel and the 4^th and 6^th moments of each of the at least two data streams are determined based on gain and mode settings for the at least one data channel.

6. The method of claim 5, wherein the 4^th and 6^th moments of each of the at least two data streams are determined based on at least one of the following:

a computation in a closed mathematical form and storage in a look-up table for different possible data stream configurations in the multi carrier transmitter;

a computation by polynomial approximation;

a computation by interpolation; and

a computation by a mixture of the three before-mentioned computations.

7. The method of claim 1, wherein calculating the combined transmit signal adaptation metric takes into account a power imbalance between the at least two data streams.

8. The method of claim 1, wherein the mobile communication system is configured to operate according to a code division multiple access (CDMA) mode.

9. The method of claim 1, wherein the multi carrier transmitter is configured to operate according to a dual carrier-high speed uplink packed access (DC-HSUPA) mode.

10. A method for operating a multi carrier transmitter, comprising:

providing at least two data streams to be transmitted on the multi carriers, wherein each data stream comprises at least one data channel;

looking up predetermined transmit signal adaptation metrics in a look up table for each data stream based on a respective actual data stream configuration to ascertain separate transmit signal adaptation metrics;

calculating a combined transmit signal adaptation metric based on the separate transmit signal adaptation metrics; and

adapting the at least two data streams to be transmitted on the multi carriers based on the calculated combined transmit signal adaptation metric in a feed forward manner.

11. The method of claim 10, further comprising:

using the same entries in the look-up table for the at least two data streams independently.

12. The method of claim 10, further comprising:

taking into account a power imbalance between the at least two data streams when calculating the combined transmit signal adaptation metric.

13. The method of claim 10, further comprising:

adapting the at least two data streams to be transmitted in a base band based on the calculated combined transmit signal adaptation metric.

14. The method of claim 10, further comprising:

adapting the at least two combined data streams to be transmitted in a radio frequency band based on the calculated combined transmit signal adaptation metric.

15. The method of claim 10, further comprising:

adjusting an amplification factor of a power amplifier amplifying a combined data stream formed by the at least two combined data streams combined in a radio frequency band based on the calculated combined transmit signal adaptation metric.

16. The method of claim 10, wherein the multi carrier transmitter is configured to operate according to a dual carrier-high speed uplink packed access (DC-HSUPA) mode.

17. A multi carrier transmitter for transmitting a respective data stream on each of the multiple carrier frequencies, the transmitter comprising:

a look up table configured to store pre-calculated transmit signal adaptation metric values for a data stream based on possible data stream configurations; and

a calculation unit configured to retrieve the transmit signal adaptation metric values from the look up table for each of multiple data streams to be transmitted based on an actual data stream configuration of each data stream, and calculate, based on the retrieved values, a combined transmit signal adaptation metric.

18. The multi carrier transmitter of claim 17, further comprising:

a power amplifier configured to amplify an overall transmit signal which comprises a combination of the data streams to be transmitted; and

an adjustment unit configured to adjust an amplification factor of the power amplifier based on the calculated combined transmit signal adaptation metric.

19. The multi carrier transmitter of claim 18, further comprising:

a digital front-end configured to combine the respective data streams to be transmitted in a base band, wherein the adjustment unit is further configured to adjust the data streams in the digital front-end according to the calculated combined transmit signal adaptation metric.

20. The multi carrier transmitter of claim 18, further comprising:

a radio frequency front-end configured to transfer the data streams to be transmitted into a radio frequency band, wherein the adjustment unit is further configured to adjust the data streams in the radio frequency front-end based on the calculated combined transmit signal adaptation metric.