中文

Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (1): 33-38.doi: 10.3969/j.issn.0255-8297.2011.01.006

• Communication Engineering • Previous Articles     Next Articles

Scaling Factor Quantization for LDPC Codes

ZHANG Xiao-jun1, TIAN Ying-hong1, YU lei1, RAN feng2, LAI Zong-sheng1   

  1. 1. College of Information Science and Engineering, East China Normal University, Shanghai 200062, China
    2. Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University,
    Shanghai 200072, China
  • Received:2010-10-25 Revised:2010-12-10 Online:2011-01-26 Published:2011-01-25

PDF

1741

Abstract:

This paper proposes a quantization scheme for low density parity check(LDPC) codes based on scaling factor by analyzing message distribution and the effect of quantization saturation. Messages are scald for the check nodes and variable nodes, and for the initial channel value. Using the scaling, the scheme allows the integer part of message to include more information, and can lower the effect of quantization saturation. Messages of nodes are quantized with (q; 0). Due to the application of integer part instead of floating point operation, the hardware complexity is significantly reduced. Simulation of (7 493, 3 048) using normalized Min-Sum displays an implementation loss of about 0.1 dB compared with floating performance.

Key words: quantization, scaling factor, message distribution, quantization saturation, LDPC

CLC Number: