Anytime Characteristics of Protograph-Based LDPC Convolutional Codes

作者：Zhang Nan^*; Noor A Rahim Md; Vellambi Badri N; Nguyen Khoa D

来源：IEEE Transactions on Communications, 2016, 64(10): 4057-4069.

DOI：10.1109/TCOMM.2016.2602202

• Anytime codes
• protograph-based codes
• LDPC convolutional codes
• density evolution
• delay exponent

Anytime transmission has been shown to be an effective means of stabilizing an unstable system over noisy channels. A crucial issue in implementing anytime transmission strategies is the design of anytime codes that offer good finite-length performance and asymptotic anytime properties. This paper introduces an efficient anytime code derived from protograph-based low-density parity-check convolutional codes known as extended S-LDPCC (XS-LDPCC) codes. The asymptotic anytime properties of XS-LDPCC codes over both the binary erasure channel (BEC) and the binary-input additive white Gaussian noise (BIAWGN) channel are demonstrated through density evolution. By means of certain observations verified by simulations, we provide accurate estimates of the delay exponents of XS-LDPCC codes over the BEC and the BIAWGN channel. Through simulations, the finite-length performance of XS-LDPCC codes and the effects of different code design parameters are quantified.

• 出版日期2016-10