Method and System for Detecting Code Sequences in Ultra-Wideband Systems

• US 20090225812A1
• Filed: 03/14/2006
• Published: 09/10/2009
• Est. Priority Date: 03/16/2005
• Status: Abandoned Application

• Current Assignee: Agency For Science Technology and Research
• Original Assignee: Agency For Science Technology and Research
• Inventors: Chin, Po Shin Francois, Peng, Xiaoming
• Application Number:
  US11/908,755
• Publication Number:
  US 20090225812A1
• Time in Patent Office: Days
• US Class Current: 375/138
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04B 2001/6908 using time hopping

Abstract

A method and a system are provided for detecting a code sequence in an ultra-wideband system. An on-off keying (OOK) detector is used for detecting a code sequence. A soft despreader is used for despreading the energy of the code sequence to provide a plurality of multipath energies. A RAKE combiner combines the plurality of multipath energies obtained from the soft despreader. The soft despreader and the RAKE combiner enable operation of an OOK receiver without using a timing recovery process block.

Claims

1. A method for detecting a code sequence in an ultra-wideband system, which comprises:

using an on-off keying detector for detecting a code sequence;

using a soft despreader for despreading an energy of the code sequence to provide a plurality of multipath energies; and

using a RAKE combiner for combining the plurality of multipath energies obtained from the soft despreader.

2. The method according to claim 1, wherein the step of detecting the code sequence includes converting the code sequence to a binary code sequence.

3. The method according to claim 1, wherein the code sequence is a ternary orthogonal code sequence.

4. The method according to claim 3, wherein the step of detecting the code sequence includes converting the code sequence to a binary code sequence.

5. The method according to claim 1, wherein the code sequence is a ternary orthogonal code sequence with time hopping.

6. The method according to claim 5, wherein the step of detecting the code sequence includes converting the code sequence to a binary code sequence.

7. The method according to claim 1, wherein the on-off keying detector is a non-coherent on-off keying receiver.

8. The method according to claim 7, wherein the step of detecting the code sequence includes converting the code sequence to a binary code sequence.

9. The method according to claim 7, wherein the non-coherent on-off keying detector includes a square law device, an integrator, and an analog-to-digital converter.

10. The method according to claim 9, wherein the step of detecting the code sequence includes converting the code sequence to a binary code sequence.

11. The method according to claim 1, wherein the soft despreader is a binary sequence soft despreader.

12. A system for detecting a code sequence in an ultra-wideband system, which comprises:

an on-off keying detector for detecting a code sequence;

a soft despreader for despreading an energy of the code sequence to provide a plurality of multipath energies; and

a RAKE combiner for combining the plurality of multipath energies obtained from the soft despreader.

13. The system according to claim 12, wherein the code sequence is a ternary orthogonal code sequence.

14. The system according to claim 12, wherein the code sequence is a ternary orthogonal code sequence with time hopping.

15. The system according to claim 12, wherein the on-off keying detector is a non-coherent on-off keying detector.

16. The system according to claim 15, wherein the non-coherent on-off keying detector includes a square law device, an integrator, and an analog-to-digital converter.

17. The system according to claim 12, wherein the on-off keying detector converts the code sequence to a binary code sequence.

18. The system according to claim 12, wherein the soft despreader is a binary sequence soft despreader.