Method and system for implementing a system acquisition function for use with a communication device

• US 7,400,668 B2
• Filed: 02/04/2002
• Issued: 07/15/2008
• Est. Priority Date: 03/22/2001
• Status: Expired due to Term

• Current Assignee: Cornami, Inc.
• Original Assignee: QST Holdings LLC
• Inventors: Scheuermann, Walter James, Heidari, Ghobad, Chang, Kuor-Hsin, Master, Paul L., Hogenauer, Eugene B.
• Primary Examiner(s): VO, DON NGUYEN
• Application Number:
  US10/067,496
• Publication Number:
  US 20040008640A1
• Time in Patent Office: 2,353 Days
• Field of Search: 375142-145, 375148-150, 375/152, 375/343, 370/320, 370/335, 370/342, 370/441, 370/209
• US Class Current: 375/148
• CPC Class Codes: G06F 15/7867 with reconfigurable architecture
• CPC Class Codes: H04B 1/708 Parallel implementation
• CPC Class Codes: H04B 2201/70711 with modular structure

Abstract

A system acquisition module and corresponding method for facilitating PN code searching which has a PN sequence generator configurable to generate a plurality of PN sequences. The module and method also includes computational units configurable to correlate each received signal sample of a plurality of received signal samples with a corresponding PN sequence of the plurality of PN sequences, and further configurable to provide other hardware resources. A number of computational units from the plurality of computational units are selectively configured to correlate the received signal samples with the PN sequences-the number depending upon availability of the plurality of computational units from providing the other hardware resources. In another embodiment, a communication device having a system acquisition function is provided which includes the system acquisition module and a receiver configured to receive signals, where a plurality of configurable computational units are selectively configurable to implement the PN sequence generator.

Claims

1. A system acquisition module for facilitating PN code searching, comprising:

a PN sequence generator configurable to generate a plurality of PN sequences; and

a plurality of computational units configurable to correlate each received signal sample of a plurality of received signal samples with a corresponding PN sequence of the plurality of PN sequences and further configurable to provide other hardware resources; and

wherein a number of computational units from the plurality of computational units are selectively configured to correlate the plurality of received signal samples with the plurality of PN sequences, the number of computational units depending upon the availability of the plurality of computational units from providing the other hardware resources.

2. The system acquisition module according to claim 1 wherein the plurality of received signal samples is received in a sequential manner, the plurality of PN sequences is generated in a sequential order, and starting positions of any two adjacent PN sequences are offset by a chip.

3. The system acquisition module according to claim 2 wherein the start of each successive one of the plurality of PN sequences is determined by shifting an immediately preceding one of the PN sequences.

4. The system acquisition module according to claim 2 wherein each of the plurality of received signal samples is correlated with the corresponding one of the plurality of PN sequences as soon as each of the plurality of received signal samples is received.

5. The system acquisition module according to claim 4 wherein, after correlating each received signal sample with a corresponding PN sequence, the received signal sample is discarded.

6. The system acquisition module according to claim 1 wherein each of the plurality of PN sequences has M components;

and wherein the number of computational units selectively configured to correlate the plurality of received signal samples with the plurality of PN sequences is M.

7. The system acquisition module according to claim 1 wherein the number of computational units which are selectively configured to correlate the plurality of received signal samples with the plurality of PN sequences is capable of being reduced when a clock rate driving the plurality of computational units is increased.

8. The system acquisition module according to claim 1 wherein the number of computational units which are selectively configured to correlate the plurality of received signal samples with the plurality of PN sequences is capable of being reduced when the availability of the plurality of computational units is reduced.

9. The system acquisition module according to claim 1 wherein the system acquisition module is located in a communication device.

10. The system acquisition module according to claim 9 wherein the communication device is a mobile phone for use in a CDMA communication system.

11. A communication device having a system acquisition function, comprising:

a receiver configured to receive a plurality of signals;

a plurality of configurable computational units selectively configurable to implement a PN sequence generator to generate a plurality of PN sequences, a correlator to correlate the plurality of signals with the plurality of PN sequences, and other hardware resources;

wherein a number of configurable computational units of the plurality of configurable computation units is selectively configured to implement the sequence generator and the correlator, the number of the configurable computational units depending upon availability of the plurality of configurable computational units from providing the other hardware resources.

12. The communication device according to claim 11 wherein:

the receiver provides the plurality of signals as a plurality of received signal samples is in a sequential manner;

the plurality of PN sequences is generated in a sequential order; and

each of the plurality of signal samples is correlated with a corresponding one of the plurality of PN sequences.

13. The communication device according to claim 12 wherein the start of each successive one of the plurality of PN sequences is determined by shifting an immediately preceding one of the PN sequences.

14. The communication device according to claim 12 wherein each of the plurality of signal samples is correlated with the corresponding one of the plurality of PN sequences as soon as the signal sample is received.

15. The communication device according to claim 14 wherein, after correlating each signal sample with a corresponding PN sequence, the signal sample is discarded.

16. The communication device according to claim 11 wherein each of the plurality of PN sequences has M chips and the number of configurable computational units selectively configured to implement the correlator is M or smaller.

17. The communication device according to claim 11 wherein the number of configurable computational units is capable of being reduced when a clock rate driving the plurality of configurable computational units is increased.

18. The communication device according to claim 11 wherein the number of configurable computational units is capable of being reduced when the availability of the plurality of configurable computational units is reduced.

19. The communication device according to claim 11 wherein one or more of the number of configurable computational units are selectively configurable to implement the other hardware resources when not needed to implement the sequence generator or the correlator.

20. The communication device according to claim 11 wherein the communication device is a mobile phone for use in a CDMA communication system.

21. A method for implementing a system acquisition function, comprising:

receiving a plurality of signals;

selectively configuring a plurality of configurable computational units for generating a plurality of PN sequences, for correlating the plurality of signals with the plurality of PN sequences, and for providing other hardware resources;

wherein a number of configurable computational units is selectively configured for generating a plurality of PN sequences and for correlating the plurality of signals with the plurality of PN sequences, the number of the configurable computational units depending upon availability of the plurality of configurable computational units from providing the other hardware resources.

22. The method of claim 21 wherein:

the plurality of signals is provided as a plurality of received signal samples in a sequential manner;

the plurality of PN sequences is generated in a sequential order; and

each of the plurality of signal samples is correlated with a corresponding one of the plurality of PN sequences.

23. The method of claim 22 further comprising determining the start of each successive one of the plurality of PN sequences by shifting an immediately preceding one of the PN sequences.

24. The method of claim 23 wherein the correlating comprises correlating each of the plurality of signal samples with the corresponding one of the plurality of PN sequences as soon as the signal sample is received.

25. The method of claim 24 further comprising discarding each signal sample after correlating the signal sample with a corresponding PN sequence.

26. The method of claim 21, wherein each of the plurality of PN sequences has M chips and the number of configurable computational units selectively configured for correlating is M or smaller.

27. The method of claim 21, further comprising increasing the clock rate driving the plurality of configurable computational units and, once the clock rate is increased, reducing the number of configurable computational units.

28. The method of claim 21, further comprising reducing the number of configurable computational units when the availability of the plurality of configurable computational units is reduced.

29. The method of claim 21, selectively configuring one or more of the number of configurable computational units for providing the other hardware resources when not needed for generating the plurality of PN sequences or for correlating the plurality of signals.

30. The method of claim 21, wherein the method is utilized in a mobile phone for use in a CDMA communication system.