NDLI: Chip-equalised UMTS downlink for fast fading channels

Content Provider	IEEE Xplore Digital Library
Author	White, G. Zakharov, Y. Burr, A.
Copyright Year	2004
Description	Author affiliation: Commun. Res. Group, York Univ., UK (White, G.; Zakharov, Y.; Burr, A.)
Abstract	The 3/sup rd/ generation of mobile communications networks, such as those based on WCDMA, will require high performance downlink receivers to maximise capacity. The Rake receiver, commonly proposed for WCDMA systems to counteract multipath channel effects, provides poor performance when there are a high number of active users per cell. This is due to loss of orthogonality between user spreading codes, which results in high levels of multiple access interference (MAI). Chip equalisation has been shown to suppress MAI by restoring the orthogonality of user codes prior to despreading. We propose a simple system for chip equalisation of 3/sup rd/ generation UMTS transmission frames in fast fading channels. FIR MMSE equalisation with common pilot channel estimation is used and slot-wise linear interpolation between equaliser tap coefficients provides a simple method for tracking the time-varying channel. The performance of the proposed system over a vehicular multipath time-variant channel is assessed by simulation. The benefits to system performance of UMTS-standard turbo coding and interleaving in the fast fading environment are studied. Performance is compared with the equivalent Rake receiver at each stage. It is shown that, despite increased sensitivity to channel estimation error relative to the Rake receiver, the proposed method can be used to achieve significant performance benefits in highly-loaded cells, even for high mobile terminal speed. Performance benefits are particularly marked where chip equalisation is used in conjunction with turbo coding and interleaving.
Starting Page	377
Ending Page	381
File Size	1695203
Page Count	5
File Format	PDF
ISBN	0780383370
DOI	10.1109/SPAWC.2004.1439268
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-11
Publisher Place	Portugal
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	3G mobile communication Downlink Fading Multipath channels Multiple access interference Multiaccess communication Channel estimation Turbo codes Interleaved codes Mobile communication
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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