NDLI: Chip-Level DS-CDMA Downlink Interference Suppression With Optimized Finger Placement

Content Provider	IEEE Xplore Digital Library
Author	Sui, H. Masry, E. Rao, B.D.
Copyright Year	1991
Abstract	In direct-sequence code-division multiple-access (DS-CDMA) downlink, multiaccess interference arises due to the loss of orthogonality of the spreading codes for each user in frequency-selective channels. We analyze the receiver structure where a linear combiner with a RAKE structure is used. A generic model is developed to account for arbitrary finger placement, which allows many CDMA downlink linear receivers to be treated as special cases. For fixed finger placement, we derive the optimal weights for the receiver under both chip-level and symbol-level criteria. We show that the weights designed to minimize the chip mean-square error (MSE) also maximizes the output symbol signal-to-interference-noise ratio (SINR) and differs only by a scaling factor from the weights that minimizes the symbol MSE. The performance of the receiver depends heavily on the finger placement scheme. We propose two strategies for finger placement design. The first one is analytical and is based on the sampling design theory. It gives the optimal finger placement in an asymptotic sense as the number of fingers becomes large and sheds important light on how the performance of the system depends on the number of fingers and the smoothness of the underlying chip pulse waveform. The other design is numerical and is based on a greedy search algorithm. An efficient recursive algorithm is developed to reduce the computational complexity associated with the search. For Rayleigh-fading channels, numerical results show that both design schemes achieve significantly better performance than uniformly spaced finger placement with the same number of fingers, or achieve performance similar to that of uniformly spaced finger placement but with a much smaller number of fingers
Sponsorship	IEEE Signal Processing Society
Starting Page	3908
Ending Page	3921
Page Count	14
File Size	1357994
File Format	PDF
ISSN	1053587X
Volume Number	54
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Downlink Interference suppression Fingers RAKE receivers Multiple access interference Frequency division multiaccess Signal design Signal to noise ratio Sampling methods sampling design theory Chip-level equalization direct-sequency code-division multiple access (DS-CDMA) finger placement interference suppression RAKE receiver
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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

A Blind RAKE Receiver With Robust Multiuser Interference Cancelation for DS/CDMA Communications

Switched Interleaving Techniques with Limited Feedback for Interference Mitigation in DS-CDMA Systems

Blind adaptive DS/CDMA receivers for multipath and multiuser environments

An interference-suppressing RAKE receiver for the CDMA downlink

Fuzzy Based Chip Level Based Receiver For Direct Sequence-Code Division Multiple Access Communication System

Adaptive generalized rake reception in DS-CDMA systems - [transactions papers]

Performance bounds on chip-matched-filter receivers for bandlimited DS/SSMA communications

A Novel Transmitter-Based Selective-Precoding Technique for DS/CDMA Systems

Experimental evaluation of RAKE finger life distance for CDMA systems

Chip-Level DS-CDMA Downlink Interference Suppression With Optimized Finger Placement

Similar Documents

A Blind RAKE Receiver With Robust Multiuser Interference Cancelation for DS/CDMA Communications

Switched Interleaving Techniques with Limited Feedback for Interference Mitigation in DS-CDMA Systems

Blind adaptive DS/CDMA receivers for multipath and multiuser environments

An interference-suppressing RAKE receiver for the CDMA downlink

Fuzzy Based Chip Level Based Receiver For Direct Sequence-Code Division Multiple Access Communication System

Adaptive generalized rake reception in DS-CDMA systems - [transactions papers]

Performance bounds on chip-matched-filter receivers for bandlimited DS/SSMA communications

A Novel Transmitter-Based Selective-Precoding Technique for DS/CDMA Systems

Experimental evaluation of RAKE finger life distance for CDMA systems

Chip-Level DS-CDMA Downlink Interference Suppression With Optimized Finger Placement