Decoding method for detecting PLSC from frames of satellite broadcasting system

• US 7,587,653 B2
• Filed: 05/26/2006
• Issued: 09/08/2009
• Est. Priority Date: 12/09/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Tae-Hoon, Sung, Wonjin, Chang, Dae-Ig, Kim, Pan-Soo, Oh, Deock-Gil, Lee, In-Ki, Kang, Seokheon, Kang, Deokchang
• Primary Examiner(s): Baker; Stephen M
• Application Number:
  US11/442,363
• Publication Number:
  US 20070150796A1
• Time in Patent Office: 1,201 Days
• Field of Search: 714/752
• US Class Current: 714/752
• CPC Class Codes: H03M 13/136 Reed-Muller [RM] codes
• CPC Class Codes: H03M 13/15 Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes H03M13/17 takes precedence
• CPC Class Codes: H03M 13/6561 Parallelized implementations
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence

Abstract

Provided is a decoding method for detecting Physical Layer Signaling Codes (PLSCs) from frames of a satellite broadcasting system. The method includes: a) acquiring a summation vector and a subtraction vector from an inputted symbol vector; b) performing parallel Reed-Muller (32,6) decoding onto the summation and subtraction vectors based on a Hadamard matrix and estimating message bits of the summation and subtraction vectors; c) performing PLSC coding and modulation onto the message bits of the summation and subtraction vectors; d) calculating a first difference between symbols of the received symbol vector and the summation vector symbols, and a second difference between the symbols of the received symbol vector and the subtraction vector symbols; and e) when the first difference is smaller than the second difference, determining a Reed-Muller codeword is repeated, or when the first difference is larger than the second difference, determining that the Reed-Muller codeword is inverted.

Claims

1. A decoding method for detecting Physical Layer Signaling Code (PLSC) information from frames of a satellite broadcasting system, comprising the steps of:

a) receiving a symbol vector and acquiring a summation vector and a subtraction vector from a pair of symbols of the received symbol vector;

b) performing parallel Reed-Muller (32,6) decoding onto the summation vector and the subtraction vector based on a Hadamard matrix and estimating message bits of the summation vector and message bits of the subtraction vector;

c) performing PLSC coding on the message bits of the summation vector and the message bits of the subtraction vector, and modulating the coded message bits of the summation vector and the coded message bits of the subtraction vector to produce summation vector symbols and subtraction vector symbols, respectively;

d) calculating a first difference value between symbols of the received symbol vector and the summation vector symbols, and a second difference value between the symbols of the received symbol vector and the subtraction vector symbols, individually; and

e) when the first difference value is smaller than the second difference value, determining that a Reed-Muller codeword is repeated, or when the first difference value is larger than the second difference value, determining that the Reed-Muller codeword is inverted.

2. The decoding method as recited in claim 1, wherein, in the step a), when the Reed-Muller codeword is repeated and a received symbol r transmitted through an idealistic channel, Reed-Muller (32,6) decoding is performed with enhanced decoding reliability by using a 32-symbol summation vector which has a value of 2 or −

2, instead of using a 64-symbol summation vector which has a value of 1 or −

1.

3. The decoding method as recited in claim 1, wherein, in the step a), when the Reed-Muller codeword is inverted and a received symbol r transmitted through an idealistic channel, Reed-Muller (32,6) decoding is performed with enhanced decoding reliability by using a 32-symbol subtraction vector which has a value of 2 or −

2, instead of using a 64-symbol subtraction vector which has a value of 1 or −

1.

4. The decoding method as recited in claim 1, wherein, in the step e), when the Reed-Muller codeword is repeated, the message bits of the summation vector includes the MODCOD and the MSB and the LSB is determined to be ‘

0.’

5. The decoding method as recited in claim 1, wherein, in the step e), when the Reed-Muller codeword is inverted, the message bits of the subtraction vector includes the MODCOD and the MSB and the LSB is determined to be ‘

1.’

6. The decoding method as recited in claim 1, wherein when pilot symbol detection is carried out prior to the decoding and no pilot symbol is detected, the decoding is carried out by using the summation vector and the LSB is determined to be ‘

0.’

7. The decoding method as recited in claim 1, wherein when pilot symbol detection is carried out prior to the decoding and there is a pilot symbol detected, the decoding is carried out by using the subtraction vector and the LSB is determined to be ‘

1.’