Open Access

Medium Access in Spread-Spectrum Ad Hoc Networks with Multiuser Detection

  • Katsutoshi Kusume1Email author,
  • Robert Vilzmann2,
  • Andreas Müller2,
  • Christian Hartmann2 and
  • Gerhard Bauch1
EURASIP Journal on Advances in Signal Processing20082009:156247

https://doi.org/10.1155/2009/156247

Received: 15 February 2008

Accepted: 22 July 2008

Published: 4 August 2008

Abstract

Conventional medium access control protocols are designed to avoid simultaneous transmissions, based on a simple collision model in the underlying physical layer. Recently, strong physical layer capabilities, enabled by multiuser detection techniques, have been studied in connection with simple medium access control protocols, for example, slotted ALOHA. We think that neither of these extreme approaches is optimum, particularly in general scenarios where network nodes with different signal processing capabilities coexist. Instead of dealing with interferences in either of the two layers alone, both medium access control and physical layer functionalities should be designed to cooperate and complement each other. We discuss several key aspects for designing such a protocol, especially with an emphasis on iterative multiuser detection, which can provide a good tradeoff between performance and complexity. We propose a new protocol called MUD-MAC which satisfies these key aspects. We analyze its throughput bound and also perform numerical simulations. The simulation results show excellent throughput improvements. It is also demonstrated that the MUD-MAC protocol provides certain fairness among network nodes with different signal processing capabilities.

Publisher note

To access the full article, please see PDF.

Authors’ Affiliations

(1)
DOCOMO Euro-Labs
(2)
Institute of Communication Networks, Munich University of Technology

Copyright

© Katsutoshi Kusume et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.