Performance Enhancement of IDMA System by Power and LDPC Code Optimization

DOI

10.2991/wcnme-19.2019.25How to use a DOI?

Keywords

multiple access channel (MAC); power allocation; LDPC codes; Gaussian approximation (GA); degree profile

Abstract

A novel way is presented to improve the performance of system in multiple access channel (MAC) by means of power allocation and low-density parity-check codes (LDPC) design. Power profiles are obtained by data optimization method based on the criteria of maximization of mutual information. Gaussian approximation (GA) method is used as a tool to approximate message the probability density function (PDF) and message updating formulas are derived. Optimized power profile and degree profiles are obtained for 2-user scenario. At the receiver side, the detector and decoder exchange extrinsic information in an iterative way. Three cases are compared given spectral efficiency 0.5. Simulation results show that 0.8dB performance gain can be achieved compared with that of only optimization of LDPC code.

Copyright

© 2019, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jingxi Zhang
PY  - 2019/06
DA  - 2019/06
TI  - Performance Enhancement of IDMA System by Power and LDPC Code Optimization
BT  - Proceedings of the 2019 International Conference on Wireless Communication, Network and Multimedia Engineering (WCNME 2019)
PB  - Atlantis Press
SP  - 107
EP  - 111
SN  - 2352-538X
UR  - https://doi.org/10.2991/wcnme-19.2019.25
DO  - 10.2991/wcnme-19.2019.25
ID  - Zhang2019/06
ER  -