Signal acquisition in a wireless communication system

• US 8,738,056 B2
• Filed: 05/21/2007
• Issued: 05/27/2014
• Est. Priority Date: 05/22/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Khandekar, Aamod, Palanki, Ravi
• Primary Examiner(s): MITCHELL, NATHAN A
• Application Number:
  US11/751,467
• Publication Number:
  US 20080285526A1
• Time in Patent Office: 2,563 Days
• Field of Search: 455/403, 455/435.2, 455/428, 455436-453, 455/515, 455/434, 455/522
• US Class Current: 455/515
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Systems and methodologies are described that generate pilots for signal acquisition in a wireless communication system based on time domain sequences. The pilots may be generated by a base station and transmitted in a pilot field to one or more access terminals to aid in signal acquisition at each of the access terminals. One of the pilots may be common to all access points in the wireless communication system, thereby allowing an access terminal to obtain a timing estimate for the system while minimizing the effects of interference variations between base stations. Further, one or more generated pilots may be unique to each access point in order to allow each respective access point to be identified by its generated pilots.

Claims

1. A method for generating and transmitting acquisition pilots in a wireless communication system, comprising:

generating a first acquisition pilot based on a portion of an identifier of a transmitter entity;

generating a second acquisition pilot based on all of the identifier of the transmitter entity;

transmitting the first acquisition pilot in a first time interval; and

transmitting the second acquisition pilot in a second time interval that is non-overlapping with the first time interval.

2. The method of claim 1, wherein the first acquisition pilot is generated based on a sequence having a low peak-to-average (PAR) ratio.

3. The method of claim 1, wherein the second acquisition pilot is generated based on a pseudo-noise (PN) sequence.

4. The method of claim 1, wherein the identifier of the transmitter entity comprises a sector identifier (ID).

5. The method of claim 1, wherein the generating the first acquisition pilot includes

generating a first pilot sequence based on the portion of the identifier of the transmitter entity, and

generating the first acquisition pilot based on the first pilot sequence.

6. The method of claim 5, wherein the generating the second acquisition pilot includes

generating a second pilot sequence based on all of the identifier of the transmitter entity, and

generating the second acquisition pilot based on the second pilot sequence.

7. The method of claim 1, further comprising:

generating a pilot based on symbols mapped to subcarriers evenly spaced in frequency; and

transmitting the pilot in a third time interval that is non-overlapping with the first and second time intervals.

8. The method of claim 1, wherein a scrambling code is applied to the second acquisition pilot.

9. The method of claim 1, wherein the first and second acquisition pilots are transmitted periodically in each time period of a predetermined duration.

10. A wireless communications apparatus, comprising:

a processor configured to generate a first acquisition pilot based on a portion of an identifier of a transmitter entity, to generate a second acquisition pilot based on all of the identifier of the transmitter entity, to transmit the first acquisition pilot in a first time interval, and to transmit the second acquisition pilot in a second time interval that is non-overlapping with the first time interval.

11. The wireless communications apparatus of claim 10, wherein the processor is further configured to generate the first acquisition pilot based on a sequence having a low peak-to-average (PAR) ratio.

12. The wireless communications apparatus of claim 10, wherein the processor is further configured to generate the second acquisition pilot based on a pseudo-noise (PN) sequence.

13. The wireless communications apparatus of claim 10, wherein the identifier for the transmitter entity comprises a sector identifier (ID).

14. The wireless communications apparatus of claim 10, wherein the processor is further configured to generate a first pilot sequence based on the portion of the identifier of the transmitter entity, and to generate the first acquisition pilot based on the first pilot sequence.

15. The wireless communications apparatus of claim 14, wherein the processor is further configured to generate a second pilot sequence based on all of the identifier of the transmitter entity, and to generate the second acquisition pilot based on the second pilot sequence.

16. The wireless communications apparatus of claim 10, wherein the processor is further configured to generate a pilot based on symbols mapped to subcarriers evenly spaced in frequency, and to transmit the pilot in a third time interval that is non-overlapping with the first and second time interval.

17. The wireless communications apparatus of claim 10, wherein the processor is further configured to generate the second acquisition pilot based on a scrambling code.

18. An apparatus for transmitting acquisition pilots in a wireless communication network, comprising:

means for generating a first acquisition pilot based on a portion of an identifier of a transmitter entity;

means for generating a second acquisition pilot based on all of the identifier of the transmitter entity;

means for transmitting the first acquisition pilot in a first time interval; and

means for transmitting the second acquisition pilot in a second time interval that is non-overlapping with the first time interval.

19. The apparatus of claim 18, wherein the first acquisition pilot is generated based on a sequence having a low peak-to-average (PAR) ratio.

20. The apparatus of claim 18, wherein the second acquisition pilot is generated based on a pseudo-noise (PN) sequence.

21. A non-transitory computer-readable medium having stored thereon computer-executable instructions for sending acquisition pilots in a wireless communication system, the instructions comprising:

generating a first acquisition pilot based on a portion of an identifier of a transmitter entity,

generating a second acquisition pilot based on all of the identifier of the transmitter entity,

transmitting the first acquisition pilot in a first time interval, and

transmitting the second acquisition pilot in a second time interval that is non-overlapping with the first time interval.

22. The non-transitory computer-readable medium of claim 21, wherein the first acquisition pilot is generated based on a sequence having a low peak-to-average (PAR) ratio.

23. The non-transitory computer-readable medium of claim 21, wherein the second acquisition pilot is generated based on a pseudo-noise (PN) sequence.

24. A processor that executes computer-executable instructions for transmitting acquisition pilots in a wireless communication network, the instructions comprising:

generating a first acquisition pilot based on a portion of an identifier of a transmitter entity;

generating a second acquisition pilot based on all of the identifier of the transmitter entity;

transmitting the first acquisition pilot in a first time interval; and

transmitting the second acquisition pilot in a second time interval that is non-overlapping with the first time interval.

25. The processor of claim 24, the instructions further comprising

generating the first acquisition pilot based on a sequence having a low peak-to-average (PAR) ratio, and

generating the second acquisition pilot based on a pseudo-noise (PN) sequence.