Optimized preamble and method for interference robust packet detection for telemetry applications

Patent metadata

Field	Value
Publication number	US-10574501-B2
Application number	US-201816140846-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Mar 31, 2016
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

Embodiments provide a receiver having a receiving unit and a synchronization unit. The receiving unit is configured to receive a data packet having a pilot sequence. The synchronization unit is configured to separately correlate the pilot sequence with at least two partial reference sequences corresponding to a reference sequence for the pilot sequence of the data packet, in order to obtain a partial correlation result for each of the at least two partial reference sequences, wherein the synchronization unit is configured to non-coherently add the partial correlation results in order to obtain a coarse correlation result for the data packet.

First claim

The invention claimed is:

1. A receiver, comprising:
a receiving unit configured to receive a data packet comprising a pilot sequence;
a synchronization unit configured to separately correlate the pilot sequence with at least two partial reference sequences, in order to acquire a partial correlation result for each of the at least two partial reference sequences;
wherein the synchronization unit is configured to non-coherently add the partial correlation results in order to acquire a coarse correlation result for the data packet;
wherein the receiving unit is configured to receive at least two data packets, wherein each of the at least two data packets comprises a pilot sequence;
wherein the synchronization unit is configured to separately correlate the pilot sequence of each of the at least two data packets with at least two partial reference sequences corresponding to a reference sequence for the pilot sequence of the corresponding data packet, in order to acquire a partial correlation result for each of the at least two partial reference sequences for each of the at least two data packets;
wherein the synchronization unit is configured to non-coherently add at least a part of the partial correlation results for each of the at least two data packets in order to acquire a coarse correlation result for each of the at least two data packets;
wherein the synchronization unit is configured to combine at least a part of the coarse correlation result of the at least two data packets, in order to acquire a combined coarse correlation result.

2. The receiver according to claim 1 , wherein the synchronization unit is configured to non-coherently add the partial correlation results by adding absolute values or squared absolute values or approximated absolute values or any other non-linear operation of the partial correlation results.

3. The receiver according to claim 1 , wherein the at least two partial reference sequences are at least two different parts of a reference sequence for the pilot sequence of the data packet.

4. The receiver according to claim 1 , wherein the data packet comprises at least two partial reference sequences as the reference sequence.

5. The receiver according to claim 1 , wherein the synchronization unit is configured to combine the coarse correlation results of the at least two data packets by using a sum or approximations of an ideal Neyman-Pearson detector of the coarse correlation results of the at least two data packets.

6. The receiver according to claim 1 , wherein the at least two data packets are parts of a telegram which is transmitted separated into the at least two data packets, wherein the receiver comprises a data packet combining unit configured to combine the at least two data packets in order to acquire the telegram.

7. The receiver according to claim 1 , wherein the synchronization unit is further configured to coherently add the partial correlation results in order to acquire a fine correlation result for the data packet.

8. The receiver according to claim 1 , wherein, if the combined coarse correlation exceeds a predefined threshold, the synchronization unit is further configured to coherently add the partial correlation results for each of the at least two data packets in order to acquire a fine correlation result for each of the at least two data packets;
wherein the synchronization unit is configured to combine the fine correlation results of the at least two data packets, in order to acquire a combined fine correlation result.

9. The receiver according to claim 1 , wherein the synchronization unit is configured to estimate a frequency offset of the data packet.

10. The receiver according to claim 9 , wherein the data packet comprises a header information coded in a phase shift of the pilot sequence;
wherein the receiver comprises a header extraction unit configured to extract the header information from the data packet by applying a frequency correction to the data packet using the estimated frequency offset and estimating the phase shift of the pilot sequence.

11. The receiver according to claim 1 , wherein the synchronization unit is configured to normalize the coarse correlation results of the at least two partial reference sequences and to combine the normalized coarse correlation results of the at least two partial reference sequences, in order to acquire a combined coarse correlation result.

12. The receiver according to claim 1 , wherein the synchronization unit is configured to normalize symbols of the pilot sequence to acquire a normalized pilot sequence and to separately correlate the normalized pilot sequences with the at least two partial reference sequences.

13. The receiver according to claim 1 , wherein the synchronization unit is configured to calculate a variance of the partial correlation results for the data packet and to detect the data packet if the variance of the partial correlation results for the data packet is smaller than or equal to a predefined threshold.

14. The receiver according to claim 1 , wherein the synchronization unit is configured to apply a weight factor to symbols of the data packet, or to apply an individual weight factor to symbols of each of the at least two partial pilot sequences, wherein the data packet comprises at least two partial reference sequences as the reference sequence, or to apply an individual weight factor to each symbol of the at least two partial pilot sequences, wherein the data packet comprises at least two partial reference sequences as the reference sequence.

15. The receiver according to claim 1 , wherein the synchronization unit is configured to detect a main lobe and side lobes of the correlation and to provide the detected main lobe as correlation result using known distances between the main lobe and the side lobes.

16. The receiver according to claim 1 , wherein the synchronization unit is configured to use a correlation window for detecting the data packet, wherein the data packet is detected by detecting the highest peak of all correlation peaks exceeding a predefined threshold within the correlation window.

17. A receiver, comprising:
a receiving unit configured to receive data packets, at least two of the data packets comprising a partial pilot sequence of at least two partial pilot sequences;
a synchronization unit configured to separately correlate the partial pilot sequences with at least two partial reference sequences, in order to acquire a partial correlation result for each of the at least two partial reference sequences;
wherein the synchronization unit is configured to non-coherently add the partial correlation results in order to acquire a coarse correlation result for the data packets;
wherein the receiving unit is configured to receive further data packets, at least two of the further data packets comprising a partial pilot sequence of at least two partial pilot sequences;
wherein the synchronization unit is configured to separately correlate the partial pilot sequences of the further data packets with at least two partial reference sequences, in order to acquire a partial correlation result for each of the at least two partial reference sequences, wherein the synchronization unit is configured to non-coherently add the partial correlation results for the further data packets in order to acquire a coarse correlation result for the further data packets;
wherein the synchronization unit is configured to combine at least a part of the coarse correlation result of the data packets and the further data packets, in order to acquire a combined coarse cor

Assignees

• Fraunhofer Ges Forschung
• Univ Friedrich Alexander Er

Inventors

• Kilian Gerd
• Bernhard Josef
• Robert Jörg
• Kneissl Jakob

Classifications

• H04L27/2675

  Pilot or known symbols · CPC title

• H04L27/2659 Primary

  Coarse or integer frequency offset determination and synchronisation · CPC title

• H04L27/2656 Primary

  Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation · CPC title

• H04B1/70752

  Partial correlation · CPC title

• H04L27/2691

  involving interference determination or cancellation · CPC title