Multi-user Communication Based OFDM-UWB System under Gaussian and Non-Gaussian Noisy Channel

Doaa E. El. Matary^1, , Esam A. A. Hagras¹ and Hala Mansour Abdel-Kader¹

¹Communication and Electronics Department, Faculty of Engineering, Shoubra, Benha University, Cairo, Egypt

Cite this paper

Doaa E. El. Matary, Esam A. A. Hagras and Hala Mansour Abdel-Kader. Multi-user Communication Based OFDM-UWB System under Gaussian and Non-Gaussian Noisy Channel. American Journal of Electrical and Electronic Engineering. 2017; 5(4):136-143. doi: 10.12691/AJEEE-5-4-3

Abstract

For a multiuser Ultra Wide Band (UWB) system, the performance is mainly limited by inherent noise and interferences such as Multiple Access Interference (MAI) and Inter Symbol Interference (ISI) which are poorly approximated by a Gaussian distribution because of their impulsive nature. A combination between Orthogonal Frequency Division Multiplexing (OFDM) and Interleave Division Multiple Access (IDMA) has been considered as an efficient technique due to its bandwidth efficiency, and robustness against MAI and ISI. Moreover, OFDM-IDMA technique has the ability to allow frequency diversity and performance improvement with the help of efficient FEC coding technique such as Low Density Parity Check (LDPC) code. Therefore, this paper addresses the performance of LDPC-coded-IDMA-based OFDM-UWB communication system under Gaussian and non-Gaussian noisy channels. Three different models as Symmetric Alpha Stable (SS), Laplacian model and Gaussian Mixture Model (GMM), have been introduced for approximating the non-Gaussian noise which are more realistic for UWB system. Simulation results show that LDPC-coded OFDM-IDMA system is robust against noise and interferences in UWB indoor environment, and achieves good performance under Cauchy (SαS) model rather than other non-Gaussian models with simple Chip-By-Chip (CBC) iterative receiver. Furthermore, the proposed system gains a significant performance improvement compared with the un-coded OFDM-IDMA-UWB system under the studied noise models.

Keywords

UWB, OFDM-IDMA, LDPC, GMM, Laplace, SαS, CBC

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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