Preamble transmission and reception method and apparatus for OFDM system

• US 9,705,724 B2
• Filed: 06/22/2015
• Issued: 07/11/2017
• Est. Priority Date: 10/20/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Hak Ju, Myung, Se Ho, Kim, Jae Yoel, Yun, Sung Ryul, Lim, Yeon Ju
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US14/746,084
• Publication Number:
  US 20150288552A1
• Time in Patent Office: 750 Days
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 1/0036 arrangements specific to the receiver
• CPC Class Codes: H04L 1/0047 Decoding adapted to other signal detection operation in conjunction with sequence estimation or equalization H04L25/03286
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2617 using block codes
• CPC Class Codes: H04L 27/2643 using symbol repetition, e.g. time domain realization of distributed FDMA
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

A method and apparatus for transmitting and receiving a preamble having sequence information for an OFDM system is provided. The preamble transmission method includes generating a preamble block including at least one frame having a header with a known sequence and a code block containing control information and transmitting the preamble block mapped to Orthogonal Frequency Division Multiplexing (OFDM) cells by repeating in frequency axis direction.

Claims

1. A method of receiving data, comprising:

receiving a signal comprising one or more preamble blocks and data within a reception bandwidth;

detecting a first preamble block of the one or more preamble blocks in the received signal;

detecting a position of a known sequence of a first Forward Error Correction (FEC) block in the detected first preamble blocks;

determining a length of control information and a start point of the control information in the detected first preambles block, by using the detected position of the known sequence of the first FEC block;

extracting the control information based on the determined length and start point of the control information; and

decoding the data in the received signal based on the extracted control information;

wherein, before transmission of the received signal, any empty portion of each preamble block of the one or more preamble blocks is filled by cyclically repeating at least a part of one or more header-preceded FEC blocks, and

wherein each of the one or more FEC blocks is generated by coding and modulating the control information and then adding a header in front of it.

2. The method of claim 1, wherein the known sequence is a pseudo noise sequence.

3. The method of claim 1, wherein the one or more FEC blocks have equal length.

4. The method of claim 1, wherein the reception bandwidth is equal to or greater than a size of a preamble block.

5. The method of claim 1, further comprising:

combining a complete control information from a complete received FEC block and a partial control information from a partial received FEC block before extracting the control information.

6. The method of claim 1, wherein each of the headers added in front of an FEC block includes length information corresponding to the FEC block it precedes.

7. An apparatus comprising:

a tuner which receives one or more preamble blocks and data through a reception bandwidth;

a sequence detector which detects a first preamble block of the one or more preamble blocks in the received signal, detects a position of a known sequence of a first Forward Error Correction (FEC) block in the detected first preamble blocks, and determines a length of control information and a start point of the control information in the detected first preamble blocks, by using the detected position of the known sequence of the first FEC block;

a control information extractor which extracts the control information based on the determined length and start point of the control information; and

a data extractor which decodes the data in the received signal based on the extracted control information;

wherein, before transmission of the received signal, any empty portion of each preamble block of the one or more preamble blocks is filled by cyclically repeating at least a part of one or more header-preceded FEC blocks, and

wherein each of the one or more FEC blocks is generated by coding and modulating the control information and then adding a header in front of it.

8. The apparatus of claim 7, wherein the known sequence is a pseudo noise sequence.

9. The apparatus of claim 7, wherein the one or more FEC blocks have equal length.

10. The apparatus of claim 7, wherein the reception bandwidth is equal to or greater than a size of a preamble block.

11. The apparatus of claim 7, wherein control information extractor combines a complete control information from a complete received FEC block and a partial control information from a partial received FEC block before extracting the control information.

12. The apparatus of claim 7, wherein each of the headers added in front of an FEC block includes length information corresponding to the FEC block it precedes.