Research Article
Research on the Selection Method of Output Degree Distributions for LT Codes
@INPROCEEDINGS{10.1007/978-3-030-93398-2_32, author={Shuang Wu and Chen Cui and Qingyang Guan}, title={Research on the Selection Method of Output Degree Distributions for LT Codes}, proceedings={Wireless and Satellite Systems. 12th EAI International Conference, WiSATS 2021, Virtual Event, China, July 31 -- August 2, 2021, Proceedings}, proceedings_a={WISATS}, year={2022}, month={1}, keywords={LT codes Rateless codes Symbol error rate Redundancy probability Overhead}, doi={10.1007/978-3-030-93398-2_32} }- Shuang Wu
Chen Cui
Qingyang Guan
Year: 2022
Research on the Selection Method of Output Degree Distributions for LT Codes
WISATS
Springer
DOI: 10.1007/978-3-030-93398-2_32
Abstract
LT codes, the first class of rateless codes, are designed to overcome the packet lossy problems. LT codes with the dynamic overhead to measure the coding efficiency. It is necessary to note that the overhead can be considered as the reciprocal of code rate. Although the overhead is dynamic, but the different overhead corresponding different coding efficiency, which means that in the practical transmission scenarios, the overhead is the lower the better. For this reason, one need to find some other parameters to make the LT codes provide suitable error correction capabilities. As the error performances of LT codes also can be determined by output degree distributions, it is necessary to select the suitable distributions to provide the LT codes can provide enough erasure correcting capability on a lower overhead. For this reason, we derive the symbol error rates and the redundant probabilities of LT codes. Based on the derive results, two constraint conditions of selection of output degree distributions are proposed. And the simulation results shown that these two conditions are valid.
