Data transmitter and data receiver

• US 9,172,522 B2
• Filed: 04/22/2013
• Issued: 10/27/2015
• Est. Priority Date: 10/29/2010
• Status: Active Grant

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Bernhard, Josef, Kilian, Gerd, Tasch, Andreas
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): Shao, Hong
• Application Number:
  US13/867,292
• Publication Number:
  US 20130230060A1
• Time in Patent Office: 918 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 2027/0093 Intermittant signals
• CPC Class Codes: H04L 25/0236 using estimation of the other symbols
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: H04L 7/00 Arrangements for synchronising receiver with transmitter synchronisation of generators of electric oscillations or pulses H03L7/00
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A data transmitter for transmitting a data packet to a data receiver via a communication channel includes a generator for generating the data packet and a transmitter for transmitting the data packet. The generator for generating the data packet is configured to generate a data packet having a first data block and a second data block and a predefined first reference sequence and second reference sequence for synchronizing the data receiver, wherein the first reference sequence is longer than the second reference sequence, and wherein in the data packet, the second data block is located between the first reference sequence and the second reference sequence, and the first reference sequence is located between the first data block and the second data block. The transmitter for transmitting the data packet is configured to transmit the data packet to the data receiver via the communication channel.

Claims

1. A data receiver for receiving a data packet from a data transmitter via a communication channel, the data packet comprising a first data block and a second data block and a predefined first reference sequence and second reference sequence for synchronizing the data receiver, wherein, in the data packet, the second data block is located between the first reference sequence and the second reference sequence, and the first reference sequence is located between the first data block and the second data block, the first reference sequence being double the length of the second reference sequence, and the first reference sequence being subdivided into a first reference subsequence and a second reference subsequence, the first reference subsequence and the second reference subsequence each comprising the length of the second reference sequence, comprising

a receiver for receiving the data packet, said receiver being configured to localize the first reference sequence and the second reference sequence of the data packet in the receive data stream and to determine the data packet on the basis of a determinable transmission parameter which may be derived from the first reference sequence and from the second reference sequence;

and

an equalizer for equalizing the data blocks of the data packet, said equalizer being configured to perform equalization for the first data block on the basis of the first reference sequence so as to achieve an equalized first data block, and to perform equalization for the second data block on the basis of the first reference sequence or of a reference subsequence adjacent to the second data block and of the second reference sequence so as to achieve an equalized second data block;

wherein

the equalizer for equalizing the data blocks is configured to perform equalization for a third data block on the basis of the encoded first data block if the first data block in the data packet exhibits a smaller temporal distance from the third data block than does the second data block, or to perform equalization for the third data block on the basis of the encoded second data block if the second data block in the data packet exhibits a smaller temporal distance from the third data block than does the first data block, the third data block being located, in the data packet, at a data packet start or data packet end.

2. The data receiver as claimed in claim 1, wherein the receiver for receiving the data packet is configured to correlate the receive data stream with the first reference sequence and with the second reference sequence, which are known to the data receiver, so as to localize the first reference sequence and the second reference sequence of the data packet in the receive data stream.

3. The data receiver as claimed in claim 1, wherein the receiver for receiving the data packet is configured to determine the transmission parameter on the basis of a frequency estimation or a phase estimation.

4. The data receiver as claimed in claim 1, wherein the equalizer for equalizing the data blocks is configured to perform the equalization for the first data block and the second data block while using a frequency estimation, phase estimation or channel estimation.

5. The data receiver as claimed in claim 1, the equalizer for equalizing the data blocks being configured to decode the equalized first data block and second data block so as to achieve a decoded first data block and second data block.

6. The data receiver as claimed in claim 1, the equalizer for equalizing the data blocks being configured to encode the decoded first data block or second data block so as to achieve an encoded first data block or second data block.

7. The data receiver as claimed in claim 1, wherein the equalizer for equalizing the data blocks is configured to perform the equalization for the third data block while using a frequency estimation, phase estimation or channel estimation.

8. The data receiver as claimed in claim 1, wherein the equalizer for equalizing the data blocks is configured to perform equalization for a first data block and a second data block, the first data block and the second data block being derived from a first base data block.

9. The data receiver as claimed in claim 8, the equalizer for equalizing the data blocks being configured to perform equalization for a fourth data block on the basis of the encoded first data block if the first data block in the data packet exhibits a smaller temporal distance from the fourth data block than does the second data block, or to perform equalization for the fourth data block on the basis of the encoded second data block if the second data block in the data packet exhibits a smaller temporal distance from the fourth data block than does the first data block, the third data block and the fourth data block being derived from a second base data block, the third data block in the data packet being located at a data packet end, and the fourth data block in the data packet being located at a data packet start.

10. The data receiver as claimed in claim 9, wherein the equalizer for equalizing the data blocks is configured to perform equalization for the third data block and the fourth data block while using a frequency estimation, phase estimation or channel estimation.

11. A method of receiving a data packet from a data transmitter via a communication channel, the data packet comprising a first data block and a second data block and a predefined first reference sequence and second reference sequence for synchronizing the data receiver, wherein, in the data packet, the second data block is located between the first reference sequence and the second reference sequence, and the first reference sequence is located between the first data block and the second data block, the first reference sequence being double the length of the second reference sequence, and the first reference sequence being subdivided into a first reference subsequence and a second reference subsequence, the first reference subsequence and the second reference subsequence each comprising the length of the second reference sequence, comprising:

localizing the first reference sequence and the second reference sequence in the receive data stream;

determining the data packet in the receive data stream on the basis of a determinable transmission parameter which may be derived from the first reference sequence and from the second reference sequence; and

equalizing the data blocks of the data packet, said equalizing including performing equalization for the first data block on the basis of the first reference sequence so as to achieve an equalized first data block, and to performing equalization for the second data block on the basis of the first reference sequence or of a reference subsequence adjacent to the second data block and of the second reference sequence so as to achieve an equalized second data block;

wherein

the equalizing further includes performing equalization for a third data block on the basis of the encoded first data block if the first data block in the data packet exhibits a smaller temporal distance from the third data block than does the second data block, or performing equalization for the third data block on the basis of the encoded second data block if the second data block in the data packet exhibits a smaller temporal distance from the third data block than does the first data block, the third data block being located, in the data packet, at a data packet start or data packet end.

12. The method of receiving a data packet as claimed in claim 11, wherein during localization of the first reference sequence and of the second reference sequence, the receive data stream is correlated with the first reference sequence and the second reference sequence, which are known to the data receiver, so as to localize the first reference sequence and the second reference sequence of the data packet in the receive data stream.

13. The method of receiving a data packet as claimed in claim 11, wherein during determination of the data packet, the transmission parameter is determined on the basis of a frequency estimation or a phase estimation.

14. A non-transitory computer readable medium including a computer program for performing, when the computer program runs on a computer or microprocessor, the method of receiving a data packet from a data transmitter via a communication channel, the data packet comprising a first data block and a second data block and a predefined first reference sequence and second reference sequence for synchronizing the data receiver, wherein, in the data packet, the second data block is located between the first reference sequence and the second reference sequence, and the first reference sequence is located between the first data block and the second data block, the first reference sequence being double the length of the second reference sequence, and the first reference sequence being subdivided into a first reference subsequence and a second reference subsequence, the first reference subsequence and the second reference subsequence each comprising the length of the second reference sequence, said method comprising:

localizing the first reference sequence and the second reference sequence in the receive data stream;

determining the data packet in the receive data stream on the basis of a determinable transmission parameter which may be derived from the first reference sequence and from the second reference sequence; and

equalizing the data blocks of the data packet, said equalizing including performing equalization for the first data block on the basis of the first reference sequence so as to achieve an equalized first data block, and to performing equalization for the second data block on the basis of the first reference sequence or of a reference subsequence adjacent to the second data block and of the second reference sequence so as to achieve an equalized second data block;

wherein

the equalizing further includes performing equalization for a third data block on the basis of the encoded first data block if the first data block in the data packet exhibits a smaller temporal distance from the third data block than does the second data block, or performing equalization for the third data block on the basis of the encoded second data block if the second data block in the data packet exhibits a smaller temporal distance from the third data block than does the first data block, the third data block being located, in the data packet, at a data packet start or data packet end.