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.
|Translated title of the contribution||Semi-hard interference cancellation for uncoded DS-CDMA systems|
|Title of host publication||Vehicular Technology Conference 2004 (VTC 2004-Fall)|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||3708 - 3712|
|Number of pages||5|
|Publication status||Published - Sep 2004|
|Event||60th Vehicular Technology Conference 2004 (VTC 2004-Fall) - Los Angeles, United States|
Duration: 28 Sep 2004 → 29 Sep 2004
|Conference||60th Vehicular Technology Conference 2004 (VTC 2004-Fall)|
|Period||28/09/04 → 29/09/04|
Bibliographical noteConference Proceedings/Title of Journal: IEEE 60th Vehicular Technology Conference, 2004 (VTC 2004-Fall)
Rose publication type: Conference contribution
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- code division multiple access
- interference suppression