name: QC-LDPC
full_form: Quasi-Cyclic Low Density Parity Check
context: Code extension of a parity-check matrix is used for IR HARQ/rate-matching support. Lower-triangular extension, which includes diagonal-extension as a special case, is used. For the QC-LDPC design, the non-zero sub-blocks have circulant weight = 1. Circulant weight is the number of superimposed circularly shifted ZZ identity matrices. In parity check matrix design, the highest code rate (Rmax,j ) to design j-th H matrix for is Rmax,j <=8/9, where Rmax,j is the code rate of the j-th H matrix before code extension is applied (0 j< J). Rmax,j is the code rate after accounting for the built-in puncturing in H matrix design. Base graph for supporting Kmax has minimum code rate Rmin,kmax of approximately 1/3. Base graph for any info block sizes K has Rmin,k >= ~1/5, provided that Nmax is not exceeded. At least 20Gbps decoder information throughput with code rate 8/9 is supported. For a given shift size Z, a QC-LDPC code can be defined by a parity check matrix which is defined by its base
description: Quasi-Cyclic Low Density Parity Check (QC-LDPC) is a type of coding technique used to correct errors in digital data transmission. It is specifically employed in 5G New Radio (NR) systems to enhance the reliability and quality of communication.
explanation: The text explicitly states that QC-LDPC is an error correction coding technique used in 5G NR, making it a technology directly related to ensuring accurate data transmission within telecommunications.
section_title: 6.1.5.1LDPC
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