Preamble transmission and reception method and apparatus for OFDM system

• US 9,065,615 B2
• Filed: 10/20/2009
• Issued: 06/23/2015
• 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, Lim, Yeon Ju, Yun, Sung Ryul
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US12/582,266
• Publication Number:
  US 20100135422A1
• Time in Patent Office: 2,072 Days
• Field of Search: 370/203, 370/319, 370/329, 370/343, 370/349, 370/480, 370/492, 375/260, 455/450, 455/509, 714/752, 714/755, 714/776
• US Class Current: 1/1
• 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 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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 preamble generation method comprising:

coding and modulating control information into one or more Forward Error Correction (FEC) blocks;

adding a header in front of each of the one or more FEC blocks;

repeating cyclically a part of the one or more header-inserted FEC blocks to fill a preamble block, the preamble block including the one or more header-inserted FEC blocks and the part; and

mapping the repeated part of the one or more header-inserted FEC blocks to one or more Orthogonal Frequency Division Multiplexing (OFDM) cells to generate the preamble block.

2. The preamble generation method of claim 1, wherein the header is generated based on a known sequence.

3. The preamble generation method of claim 2, wherein the known sequence is a pseudo noise sequence.

4. The preamble generation method of claim 1, wherein the FEC blocks have equal length.

5. The preamble generation method of claim 1, wherein the header includes length information corresponding to the one or more header-inserted FEC blocks included in the preamble block.

6. An apparatus comprising:

an encoder for coding and modulating control information into one or more Forward Error Correction (FEC) blocks;

a sequence generator for adding a header in front of each of the one or more FEC blocks;

a repeater for repeating cyclically a part of the one or more header-inserted FEC blocks to fill a preamble block, the preamble block including the one or more header-inserted FEC blocks and the part; and

a symbol mapper for mapping the repeated part of the one or more header-inserted FEC blocks to one or more Orthogonal Frequency Division Multiplexing (OFDM) cells to generate the preamble block.

7. The apparatus of claim 6, further comprising a sequence generator for generating the header and a sequence for the header.

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

9. The apparatus of claim 6, wherein the FEC blocks have equal length.

10. The apparatus of claim 6, wherein the header includes length information corresponding to the one or more header-inserted FEC blocks included in the preamble block.

11. A method for generating a preamble block from one or more Forward Error Correction (FEC) blocks, comprising:

(a) encoding and modulating control information to generate an FEC block;

(b) inserting a header in front of the FEC block;

(c) if further control information is to be transmitted, returning to step (a); and

(d) if no further control information is to be transmitted, generating a preamble block by;

(i) generating an FEC frame comprising each header and corresponding FEC block generated by steps (a)-(b) in sequence;

(ii) for a remaining portion of the preamble block not filled by the FEC frame, repeating the sequence of one or more headers and corresponding FEC blocks in the FEC frame until the preamble block is filled; and

(iii) mapping the FEC blocks to one or more Orthogonal Frequency Division Multiplexing (OFDM) cells to generate the preamble block.

12. An apparatus for generating a preamble block from one or more Forward Error Correction (FEC) blocks, comprising:

an encoder which generates an FEC block by encoding and modulating control information;

a sequence generator which generates a sequence for a header to be inserted in front of each FEC block generated by the encoder, wherein the encoder and sequence generator generate one or more FEC blocks and corresponding headers as long as there is control information to be transmitted, thereby generating an FEC frame comprising a sequence of one or more headers, each followed by its corresponding FEC block;

a repeater which, when no further control information is to be transmitted, fills whatever portion of the preamble block is not filled by the generated FEC frame by repeating the sequence of one or more headers and corresponding FEC blocks; and

a symbol mapper for mapping the FEC blocks to one or more Orthogonal Frequency Division Multiplexing (OFDM) cells to generate the preamble block.