Golay code[1] 

Description

A \([23, 12, 7]\) perfect binary linear code with connections to various areas of mathematics, e.g., lattices [2] and sporadic simple groups [3]. Adding a parity bit to the code results in the self-dual \([24, 12, 8]\) extended Golay code. Up to equivalence, both codes are unique for their respective parameters [4]. Shortening the Golay code yields the \([22,10,8]\), \([22,11,7]\), and \([22,12,6]\) shortened Golay codes [5]. The dual of the Golay code is its \([23,11,8]\) even-weight subcode [6,7].

To construct the Golay code, one can use the great dodecahedron to generate codewords by placing message bits on the faces and calculating the parity bits that live on the 12 vertices of the inner icosahedron. Its generator matrix is [8; Table II] \begin{align} \left(\begin{array}{ccccccccccccccccccccccc} 0 & 1 & 0 & 0 & 1 & 0 & 0 & 1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1\\ 1 & 0 & 0 & 1 & 0 & 0 & 1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 0\\ 0 & 1 & 1 & 0 & 1 & 1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0\\ 1 & 1 & 0 & 1 & 1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0\\ 1 & 1 & 1 & 1 & 0 & 0 & 0 & 1 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0\\ 1 & 0 & 1 & 0 & 1 & 0 & 1 & 1 & 1 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0\\ 0 & 0 & 0 & 1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0\\ 0 & 0 & 1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0\\ 0 & 1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0\\ 1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0\\ 1 & 0 & 1 & 0 & 0 & 1 & 0 & 0 & 1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \end{array}\right)~. \tag*{(1)}\end{align}

The automorphism group of the Golay code is the Mathieu group \(\mathcal{M}_{23}\), and the automorphism group of the extended Golay code is the Mathieu group \(\mathcal{M}_{24}\), two of the sporadic simple groups. The automorphism of several shortened Golay codes is \(\mathcal{M}_{22}\) [5].

Decoding

Majority decoding for the extended Golay code [9].Decoder for the extended Golay code using the hexacode [10].Both Golay codes have a trellis representation and can thus be decoded using trellis decoding [11,12].Bounded-distance decoder requiring at most 121 real operations [13].

Realizations

Extended Golay code used in the Voyager 1 and 2 spacecraft, transmitting hundreds of color pictures of Jupiter and Saturn in their 1979, 1980, and 1981 fly-bys [14].Extended Golay code used in American military standards for automatic link establishment in high frequency radio systems [15].Proofs of the quantum mechanical Kochen-Specker theorem [16].

Parents

Cousins

  • Nearly perfect code — The extended Golay code is nearly perfect.
  • Dual linear code — The dual of the Golay code is its \([23,11,8]\) even-weight subcode [6,7].
  • Self-dual linear code — The extended Golay code is the unique code at its parameters and happens to be self-dual [4][18; Remark 4.3.11].
  • Group-algebra code — The extended Golay code is a group-algebra code for various groups [19–21]; see [22; Exam. 16.5.1].
  • Universally optimal \(q\)-ary code — The Golay code and several of its extended, shortened, and punctured versions are LP universally optimal codes [23].
  • Spherical design — The dual of the Golay code forms a spherical 3-design under the antipodal mapping [24; Exam. 9.3].
  • Lexicographic code — The extended Golay code is a lexicode [25,26][3; pg. 327].
  • Icosahedron code — The parity bits of the extended Golay code can be visualized to lie on the vertices of the icosahedron; see post by J. Baez for more details. To construct the Golay code, one can use the great dodecahedron to generate codewords by placing message bits on the faces and calculating the parity bits that live on the 12 vertices of the inner icosahedron.
  • Dodecahedron code — The parity bits of the extended Golay code can be visualized to lie on the vertices of the icosahedron; see post by J. Baez for more details. To construct the Golay code, one can use the great dodecahedron to generate codewords by placing message bits on the faces and calculating the parity bits that live on the 12 vertices of the inner icosahedron.
  • \(\Lambda_{24}\) Leech lattice — The \(\Lambda_{24}\) Leech lattice can be obtained by lifting the Golay code to \(\mathbb{Z}_4\) [27], appending a parity check, and applying construction \(A_4\) [28] (see also [2]). Half of the lattice can be obtained in a different construction [29; Exam. 10.7.3].
  • Combinatorial design — The supports of the weight-seven (weight-eight) codewords of the (extended) Golay code support the Steiner system \(S(4,7,23)\) (\(S(5,6,12)\)) [30,31][2; pg. 89]. Its blocks are called octads.
  • Nordstrom-Robinson (NR) code — The NR code can be constructed using the extended Golay code by first selecting a set of Golay codewords satisfying certain conditions and then deleteing specific coordinates [3; pg. 73].
  • Hexacode — Extended Golay codewords can be obtained from hexacodewords [2]. The hexacode can be used to decode the extended Golay code [10]. There is also a connection between automoprhisms of the even Golay code and the holomorph of the hexacode [32].
  • Ternary Golay code
  • Orthogonal array (OA) — The extended Golay code is an orthogonal array of strength 7 [33; Exam. 1]
  • \([[23, 1, 7]]\) Quantum Golay code — The qubit Golay code is a CSS code constructed with the Golay code.
  • \([[30,8,3]]\) Bring code — The automorphism group of the parity-check matrix of the Golay code is the same as a certain automorphism group of the Bring code [34].

References

[1]
M. J. E. Golay, Notes on digital coding, Proc. IEEE, 37 (1949) 657.
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J. H. Conway and N. J. A. Sloane, Sphere Packings, Lattices and Groups (Springer New York, 1999) DOI
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F. J. MacWilliams and N. J. A. Sloane. The theory of error correcting codes. Elsevier, 1977.
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J. H. Conway and N. J. A. Sloane, “Orbit and coset analysis of the Golay and related codes”, IEEE Transactions on Information Theory 36, 1038 (1990) DOI
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Zoo Code ID: golay

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“Golay code”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2023. https://errorcorrectionzoo.org/c/golay
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@incollection{eczoo_golay, title={Golay code}, booktitle={The Error Correction Zoo}, year={2023}, editor={Albert, Victor V. and Faist, Philippe}, url={https://errorcorrectionzoo.org/c/golay} }
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