Software Listing of Author : "Karen Su"

A stack-based sequential depth-first decoder that returns Maximum-Likelihood solutions to spherical LAST coded MIMO system-type problems, i.e., a lattice decoder with spherical boundary control. In such problems, the depth of the search tree is known but the number of children per node is not fixed. The number of children and their associated symbol decisions are governed by the structure of the spherical LAST code. SEAL_det enforces boundary control by decomposing the code generator matrix in a manner that is like a dual to the standard sequential decoding procedure itself. Note that inputs to SEAL_det must be real. The depth-first search is effected by applying the Schnorr-Euchner (Adaptive radius) enumeration to traverse the nodes of the tree. Exclusive of spherical boundary control, its operation is identical to that of a sphere...

  • Platform: Matlab, Scripts

A stack-based sequential priority first decoder that returns Maximum-Likelihood solutions to spherical LAST coded MIMO system-type problems, i.e., a lattice decoder with spherical boundary control. In such problems, the depth of the search tree is known but the number of children per node is not fixed. The number of children and their associated symbol decisions are governed by the structure of the spherical LAST code. LAST_dec enforces boundary control by decomposing the code generator matrix in a manner that is like a dual to the standard sequential decoding procedure itself. Note that inputs to LAST_dec must be real; in practice, this implementation of the sequential decoding algorithm is near-ML because it operates with finite memory. If that memory is exceeded, nodes are dropped from the stack and the number of such dropped...

  • Platform: Matlab, Scripts

A stack-based sequential priority first decoder that returns Maximum-Likelihood solutions to spherical LAST coded MIMO system-type problems, i.e., a lattice decoder with spherical boundary control. In such problems, the depth of the search tree is known but the number of children per node is not fixed. The number of children and their associated symbol decisions are governed by the structure of the spherical LAST code. LAST_dec enforces boundary control by decomposing the code generator matrix in a manner that is like a dual to the standard sequential decoding procedure itself. Note that inputs to LAST_dec must be real; in practice, this implementation of the sequential decoding algorithm is near-ML because it operates with finite memory. If that memory is exceeded, nodes are dropped from the stack and the number of such dropped nodes...

  • Platform: Matlab, Scripts

A stack-based sequential priority first decoder that returns Maximum-Likelihood solutions to M-QAM modulated MIMO system-type problems, i.e., a lattice decoder with optional justified rectangular boundary control. In such problems, the depth of the search tree is known and the number of children per node is also fixed. Real or complex inputs are permitted; in practice, this implementation of the sequential decoding algorithm is near-ML because it operates with finite memory. If that memory is exceeded, nodes are dropped from the stack and the number of such dropped nodes is returned. In addition, this implementation allows specification of the size of the finite memory block (in terms of number of nodes) allocated for its execution. Generally we find that restricting the sequential decoder to finite memory is not a major...

  • Platform: Matlab, Scripts

A stack-based sequential depth-first decoder that returns Maximum-Likelihood solutions to M-QAM modulated MIMO system-type problems, i.e., a lattice decoder with optional justified rectangular boundary control. In such problems, the depth of the search tree is known and the number of children per node is also fixed. Real or complex inputs are permitted. The depth-first search is effected by applying the Schnorr-Euchner (Adaptive radius) enumeration to traverse the nodes of the tree. Please see the function pre-amble (type `help SEA_det` at the Matlab prompt) for more details.

  • Platform: Matlab, Scripts
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