CHANNEL MEASUREMENTS ON COMBINED PILOT SIGNALA IN MULTI-CARRIER SYSTEMS

• US 20100074127A1
• Filed: 02/15/2007
• Published: 03/25/2010
• Est. Priority Date: 02/15/2007
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Du, Jiuhui, Xiao, Lei
• Application Number:
  US12/527,525
• Publication Number:
  US 20100074127A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/086 using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

In a base station and a mobile station the pilot signal power in all carriers are combined for example by using an MRC (Maximum Ratio Combination) algorithm. Physical layer measurement such as Up-Link Synchronization and Angle of Arrival (AoA) are performed based on the combined received signal. The method results in that the measurement errors can be significantly reduced.

Claims

1. A method of performing channel measurements in a multi-carrier cellular radio system, comprising the steps of:

receiving a data signal on multiple carriers, a pilot signal being received on each carrier;

combining the power of the multiple pilot signals into a combined pilot signal and,

performing channel measurements of the combined pilot signal.

2. The method according to claim 1, wherein the power of the pilot signals are combined using a Maximum Ratio Combination (MRC) algorithm.

3. The method according to claim 1, wherein the performed channel measurements include measurement of the Channel Impulse Response (CIR).

4. The method according to claim 1, wherein performed channel measurements include measurement of receiving power.

5. The method according to claim 1, wherein performed channel measurements include measurement of up-link synchronization

6. The method according to claim 1, wherein performed channel measurements include measurement of the Angle of Arrival (AoA).

7. The method according to claim 1, wherein the pilot signal is a midamble code.

8. A base station, comprising:

means for receiving a data signal on multiple carriers, a pilot signal being received on each carrier;

means for combining the power of the pilot signals into a combined pilot signal; and

,

means for performing channel measurements of the combined pilot signal.

9. The base station according to claim 8, further comprising means for combining the power of the pilot signals using a Maximum Ratio Combination (MRC) algorithm.

10. The base station according to claim 8, further comprising means for performing measurements of the Channel Impulse Response (CIR).

11. The base station according to claim 8, further comprising means for performing measurements of the receiving power.

12. The base station according to claim 8, further comprising means for performing measurements of the arrival time for performing up-link synchronization.

13. The base station according to claim 8, further comprising means for performing measurements of the Angle of Arrival (AoA).

14. The base station according to claim 8, wherein the pilot signal is a midamble code.

15. A mobile station, comprising:

means for receiving a data signal on multiple carriers, a pilot signal being received on each carrier;

means for combining the power of the pilot signals into a combined pilot signal and,

means for performing channel measurements of the combined pilot signal.

16. The mobile station according to claim 15, further comprising means for combining the power of the pilot signals using a Maximum Ratio Combination (MRC) algorithm.

17. The mobile station according to claim 15, further comprising means for performing measurements of the Channel Impulse Response (CIR).

18. The mobile station according to claim 15, further comprising means for performing measurements of the receiving power.

19. The mobile station according to claim 15, further comprising means for performing measurements of the arrival time for performing down-link synchronization.

20. The mobile station according to claim 15, wherein the pilot signal is a midamble code.