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Semi-hard interference cancellation for uncoded DS-CDMA systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationVehicular Technology Conference 2004 (VTC 2004-Fall)
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
Pages3708 - 3712
Number of pages5
ISBN (Print)10903038
StatePublished - Sep 2004
Event60th Vehicular Technology Conference 2004 (VTC 2004-Fall) - Los Angeles, United States


Conference60th Vehicular Technology Conference 2004 (VTC 2004-Fall)
CountryUnited States
CityLos Angeles


A new iterative technique for suppressing multiuser interference in uncoded DS-CDMA systems is proposed. In the new approach semi-hard decisions are taken at the output of the linear MMSE detector. This involves taking hard decisions only for symbols which satisfy a reliability criterion, while the rest are left unaltered in their soft form. The semi-hard estimate is subsequently used for parallel interference cancellation, which is then followed by additional linear MMSE filtering. This procedure is repeated a small number of times. Simulation results show that the proposed detector is capable of approaching closely the single-user performance in a fully loaded multiuser scenario and this is achieved within 5 to 10 iterations. In the same system scenario the new technique outperforms the probabilistic data association (PDA) algorithm, which is considered as a state-of-the art solution. The computational complexity of the proposed detector is of the same order as of a standard linear detector.

Additional information

Conference Proceedings/Title of Journal: IEEE 60th Vehicular Technology Conference, 2004 (VTC 2004-Fall) Rose publication type: Conference contribution Terms of use: Copyright © 2004 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference, Fall-2004. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

  • code division multiple access, interference suppression


60th Vehicular Technology Conference 2004 (VTC 2004-Fall)

Duration28 Sep 200429 Sep 2004
CityLos Angeles
CountryUnited States

Event: Conference

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