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The Scientific World Journal
Volume 2014, Article ID 174294, 6 pages
Research Article

Design of Simplified Maximum-Likelihood Receivers for Multiuser CPM Systems

State Key Laboratory of ISN, Xidian University, Xi’an 710071, China

Received 26 August 2013; Accepted 4 November 2013; Published 27 January 2014

Academic Editors: N. Aydin and X. Fan

Copyright © 2014 Li Bing and Baoming Bai. 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.


A class of simplified maximum-likelihood receivers designed for continuous phase modulation based multiuser systems is proposed. The presented receiver is built upon a front end employing mismatched filters and a maximum-likelihood detector defined in a low-dimensional signal space. The performance of the proposed receivers is analyzed and compared to some existing receivers. Some schemes are designed to implement the proposed receivers and to reveal the roles of different system parameters. Analysis and numerical results show that the proposed receivers can approach the optimum multiuser receivers with significantly (even exponentially in some cases) reduced complexity and marginal performance degradation.