Receiver component and method for enhancing a detection range of a time-tracking process in a receiver

Patent metadata

Field	Value
Publication number	US-9520910-B1
Application number	US-201514863572-A
Country	US
Kind code	B1
Filing date	Sep 24, 2015
Priority date	Sep 24, 2015
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A receiver component and a method for enhancing a detection range of a time synchronization process in a receiver utilize multiple cross-correlations of a received signal with a known preamble sequence. The results of the multiple cross-correlations are divided into delay segments. The delay segments of one of the multiple cross-correlations are compared with the delay segments of another of the multiple cross-correlations to determine delay of the delay segments of the one of the multiple cross-correlation results.

First claim

What is claimed is:

1. A method for enhancing a detection range of a time-tracking process in a receiver, the method comprising:
performing multiple cross-correlations on different portions of a received signal with a known preamble sequence to derive multiple cross-correlation results;
dividing each of the cross-correlation results into a plurality of delay segments; and
comparing the delay segments of one of the multiple cross-correlation results with the delay segments of another of the multiple cross-correlation results to determine delay of the delay segments of the one of the multiple cross-correlation results.

2. The method of claim 1 , wherein comparing the delay segments of one of the multiple cross-correlation results with the delay segments of another of the multiple cross-correlation results includes comparing magnitudes of the delay segments of one of the multiple cross-correlation results with magnitudes of the delay segments of another of the multiple cross-correlation results to determine delay of the delay segments of the one of the multiple cross-correlation results.

3. The method of claim 1 , wherein performing the multiple cross-correlations includes performing a first cross-correlation on a first portion of the received signal with the known preamble sequence and performing a second cross-correlation on a second portion of the received signal with the known preamble sequence, the second cross-correlation being performed at a later time than the first cross-correlation.

4. The method of claim 3 , wherein a time difference between performing the first cross-correlation and performing the second cross-correlation is set to half of fast Fourier Transform size used by the receiver.

5. The method of claim 1 , wherein dividing each of the cross-correlation results into a plurality of delay segments includes dividing each of the cross-correlation results into four delay segments.

6. The method of claim 5 , wherein the length of each of the delay segment is set to quarter of fast Fourier Transform size used by the receiver.

7. The method of claim 1 , wherein the known preamble sequence includes Time-Frequency-Phase-Reference (TFPR) symbol.

8. The method of claim 1 , wherein the received signal is an orthogonal frequency-division multiplexing (OFDM) based signal.

9. A component of a receiver comprising:
a plurality of cross-correlation modules configured to perform multiple cross-correlations on different portions of a received signal with a known preamble sequence to derive multiple cross-correlation results;
a plurality of division modules coupled to the plurality of cross-correlation modules, the division modules being configured to divide each of the cross-correlation results into a plurality of delay segments; and
an ambiguity resolution module configured to compare the delay segments of one of the multiple cross-correlation results with the delay segments of another of the multiple cross-correlation results to determine delay of the delay segments of the one of the multiple cross-correlation results.

10. The component of claim 9 , wherein the ambiguity resolution module is configured to compare magnitudes of the delay segments of one of the multiple cross-correlation results with magnitudes of the delay segments of another of the multiple cross-correlation results to determine delay of the delay segments of the one of the multiple cross-correlation results.

11. The component of claim 9 , wherein the plurality of cross-correlation modules are configured to perform a first cross-correlation on a first portion of the received signal with the known preamble sequence and to perform a second cross-correlation on a second portion of the received signal with the known preamble sequence, the second cross-correlation being performed at a later time than the first cross-correlation.

12. The component of claim 11 , wherein a time difference between performing the first cross-correlation and performing the second cross-correlation is set to half of fast Fourier Transform size used by the receiver.

13. The component of claim 9 , wherein the plurality of division modules is configured to divide each of the cross-correlation results into four delay segments.

14. The component of claim 13 , wherein the length of each of the delay segment is set to quarter of fast Fourier Transform size used by the receiver.

15. The component of claim 9 , wherein the known preamble sequence includes Time-Frequency-Phase-Reference (TFPR) symbol.

16. The component of claim 9 , wherein the received signal is an orthogonal frequency-division multiplexing (OFDM) based signal.

17. A method for enhancing a detection range of a time-tracking process in a digital audio broadcasting based receiver, the method comprising:
performing first and second cross-correlations on a received signal with a known preamble sequence to derive first and second cross-correlation results, wherein the second cross-correlation is time-shifted with respect to the first cross-correlation;
dividing each of the first and second cross-correlation results into a plurality of delay segments; and
comparing magnitude of the delay segments of the first cross-correlation results with magnitude of the delay segments of the second cross-correlation results to determine delay of the delay segments of the first cross-correlation results.

18. The method of claim 17 , wherein a time difference between performing the first cross-correlation and performing the second cross-correlation is set to half of fast Fourier Transform size used by the receiver.

19. The method of claim 17 , wherein dividing each of the first and second cross-correlation results into a plurality of delay segments includes dividing each of the first and second cross-correlation results into four delay segments.

20. The method of claim 17 , wherein the known preamble sequence includes Time-Frequency-Phase-Reference (TFPR) symbol.

Assignees

• Nxp Bv

Inventors

• Eckert Sebastian
• Kessel Martin

Classifications

• H04B1/16 Primary

  Circuits · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L27/2675

  Pilot or known symbols · CPC title

• H04L7/0079

  Receiver details · CPC title

• H04B1/18

  Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) · CPC title