Design and Analysis of Time-Invariant SC-LDPC Convolutional Codes With Small Constraint Length

作者：Battaglioni Massimo^*; Tasdighi Alireza; Cancellieri Giovanni; Chiaraluce Franco; Baldi Marco

来源：IEEE Transactions on Communications, 2018, 66(3): 918-931.

DOI：10.1109/TCOMM.2017.2774821

• Constraint length
• convolutional codes
• girth
• LDPC codes
• spatially coupled codes
• time-invariant codes

In this paper, we deal with time-invariant spatially coupled low-density parity-check convolutional codes (SC-LDPC-CCs). Classic design approaches usually start from quasi-cyclic low-density parity-check block codes and exploit suitable unwrapping procedures to obtain SC-LDPC-CCs. We show that the direct design of the SC-LDPC-CCs syndrome former matrix or, equivalently, the symbolic parity-check matrix, leads to codes with smaller syndrome former constraint lengths with respect to the best solutions available in the literature. We provide theoretical lower bounds on the syndrome former constraint length for the most relevant families of SC-LDPC-CCs, under constraints on the minimum length of cycles in their Tanner graphs. We also propose new code design techniques that approach or achieve such theoretical limits.

• 出版日期2018-3