PREAMBLE TRANSMISSION AND RECEPTION METHOD AND APPARATUS FOR OFDM SYSTEM

• US 20100135422A1
• Filed: 10/20/2009
• Published: 06/03/2010
• 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, Kim, Jae Yoel, Myung, Se Ho, Lim, Yeon Ju, Yun, Sung Ryul
• Granted Patent: US 9,065,615 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• 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 transmission method comprising:

generating a preamble block including at least one pair of a code block having control information and a header, the pair repeating to fill the preamble block; and

transmitting the preamble block after mapping to Orthogonal Frequency Division Multiplexing (OFDM) cells by repeating on frequency axis.

2. The preamble transmission method of claim 1, wherein the header having a known sequence.

3. A preamble reception method comprising:

detecting a code block within a reception bandwidth;

combining, if the code block repeats, the repeated code blocks;

extracting control information from the code block; and

decoding received data signal based on the control information.

4. The preamble reception method of claim 3, wherein detecting a code block comprises:

detecting a known sequence within the reception bandwidth;

calculating a start position and a length of the code block using the known sequence; and

locating the code block using the start position and the length of the code block.

5. A preamble transmitter comprising:

an encoder for generating at least one code block having control information;

a sequence generator for adding a header to the code block;

a repeater for repeating, when a pair of the code block and the header is shorter than a preamble block, the pair to fill the preamble block; and

a symbol mapper for transmitting the preamble block after mapping to Orthogonal Frequency Division Multiplexing (OFDM) cells by repeating on frequency axis.

6. The preamble transmitter of claim 5, wherein the sequence generator inserts a known sequence into the header.

7. A preamble receiver comprising:

a control information extractor for extracting control information from a code block within a predetermined reception bandwidth after combining, if the code block repeats within the reception bandwidth, the repeated code blocks; and

a data extractor for decoding a received data signal based on the control information.

8. The preamble receiver of claim 7, further comprising a sequence detector for detecting a known sequence within the reception bandwidth and calculating a start position and a length of the code block based on the known sequence, wherein the control information extractor locates the code block based on the start position and the length of the code block.