Pilot Channel Design for Communication Systems

• US 20070004465A1
• Filed: 06/29/2006
• Published: 01/04/2007
• Est. Priority Date: 06/29/2005
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Papasakellariou, Aris, Onggosanusi, Eko, Dabak, Anand, Muharemovic, Tarik, Schmidl, Timothy
• Application Number:
  US11/427,682
• Publication Number:
  US 20070004465A1
• Time in Patent Office: Days
• US Class Current: 455/571
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels

Abstract

Embodiments of the invention provide method and structure for boosting pilot signal power relative to data signal power. The velocity of user equipment is obtained. The velocity measurement is used in determining the transmission power of the pilot signal and applying the increase to a plurality of pilots and decreasing the data signal power by a proportional amount.

Claims

1. A method for boosting pilot signal power relative to data signal power, said method comprising:

obtaining of an user equipment velocity;

determining the transmission power for a plurality of pilot fields with positions in a sub-frame, said determination based on the velocity estimate using a set of pre-computed power values for ranges of velocity; and

performing a sub-frame transmission by applying the determined transmission power to at least a portion of the plurality of pilot fields.

2. The method of claim 1 further comprising:

obtaining of the user equipment modulation scheme;

determining the transmission power for a plurality of pilot fields based on the velocity estimate and modulation scheme using a set of pre-commuted power values for ranges of velocity; and

performing a sub-frame transmission by applying the determined transmission power to at least a portion of the plurality of pilot fields.

3. The method of claim 1 or 2, wherein the total transmission power of the user equipment in each sub-frame is kept constant by decreasing data signal power in a proportional amount to an increase in pilot signal power.

4. The method of claim 3, wherein pilot power is increased if the modulation scheme is 16 QAM modulation.

5. The method of claim 3, wherein the determined transmission power is applied only for distributed pilot signal transmission.

6. The method of claims 1 or 2, further comprising adjusting the position of each of the plurality of pilots within the sub-frame.

10. The methods of claims 1, 2, or 7, wherein the communication system is a single-carrier frequency division multiple access system.

7. A method for boosting pilot signal power relative to data signal power in a communication system including a base station and user equipment, said method comprising:

obtaining the user equipment'"'"'s velocity;

determining the transmission power for a plurality of pilot fields based on the velocity estimate using a set of pre-computed power values for ranges of velocity; and

signaling the user equipment to boost user equipment pilot signal transmission power relative to the data signal transmission power.

8. The method of claim 7, wherein doppler estimation is used to obtain user equipment velocity.

9. The method of claim 7, wherein base station receives a signal from user equipment, said signal providing the user equipment velocity.

11. A frame structure for boosting pilot signal power relative to data signal power, said structure comprising:

a plurality of long blocks containing data; and

a plurality of short blocks containing pilots

12. The frame structure of claim 11, wherein a first short block is distributed and a second block is localized.

13. The frame structure of claim 11, wherein the plurality of short blocks are distributed.

14. The frame structure of claim 11, wherein the plurality of short blocks are localized.

15. A method for boosting pilot signal power relative to data signal power in an SC-FDMA communication system, said method comprising:

increasing pilot signal power of a sub-frame; and

decreasing data signal power in order to maintain the total transmission power at a pre-determined level.

16. An apparatus for boosting pilot signal power relative to data signal power, said apparatus comprising:

a pilot power signal adjuster for increasing the transmission power for a at least a portion of a plurality of pilot fields; and

a data signal power adjuster for decreasing data signal power in order to maintain the total transmission power at a pre-determined level.

17. User equipment comprising the apparatus of claim 16, further comprising doppler estimator for providing an estimate of the velocity of the user equipment.

18. The user equipment of claim 17, further comprising storage to store a set of pre-computed power values.