NDLI: MMSE equalization of downlink CDMA channel utilizing unused orthogonal spreading sequences

Content Provider	IEEE Xplore Digital Library
Author	Jinho Choi
Copyright Year	1991
Abstract	For the code division multiple access (CDMA) downlink channel, the chip-level equalization has been considered in this paper. There is no interference after despreading if all spreading codes are orthogonal, as in IS-95. However, it cannot be true for a frequency-selective fading channel. In this case, the chip-level equalization can be applied to restore the orthogonality. We investigate the chip-level equalization using finite impulse response (FIR) equalizers for the mobile station with multiple receive antennas. A blind approach and the minimum mean square error (MMSE) approach with code-multiplexed pilot are considered. A generalized MMSE equalization, which combines the MMSE and blind approaches together, is also investigated. It is shown that the generalized MMSE equalizer can effectively increase the number of samples to track the variation of channel and thereby performs better when the coherence time is small. In addition, we derive closed-form solutions of the blind, MMSE, and generalized MMSE equalizers for given channels.
Sponsorship	IEEE Signal Processing Society
Starting Page	1390
Ending Page	1402
Page Count	13
File Size	1006912
File Format	PDF
ISSN	1053587X
Volume Number	51
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Downlink Multiaccess communication Multiple access interference Frequency-selective fading channels Multipath channels Mean square error methods Blind equalizers Multiuser detection Finite impulse response filter Receiving antennas
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

Blind equalization in antenna array CDMA systems

Constrained MMSE receivers for CDMA systems in frequency-selective fading channels

Iterative MMSE receivers for space-time trellis-coded CDMA systems in multipath fading channels

Linear MIMO equalization for CDMA downlink signals with code reuse

Partial Multiuser Detection for CS-CDMA/CP over Multipath Channels

Reduced-rank multistage receivers for DS-CDMA in frequency-selective fading channels

Iterative Multiuser Detectors for Spatial–Frequency–Time-Domain Spread Multi-Carrier DS-CDMA Systems

Multiuser channel estimation for CDMA systems over frequency-selective fading channels

Equalization with oversampling in multiuser CDMA systems

MMSE equalization of downlink CDMA channel utilizing unused orthogonal spreading sequences

Similar Documents

Blind equalization in antenna array CDMA systems

Constrained MMSE receivers for CDMA systems in frequency-selective fading channels

Iterative MMSE receivers for space-time trellis-coded CDMA systems in multipath fading channels

Linear MIMO equalization for CDMA downlink signals with code reuse

Partial Multiuser Detection for CS-CDMA/CP over Multipath Channels

Reduced-rank multistage receivers for DS-CDMA in frequency-selective fading channels

Iterative Multiuser Detectors for Spatial–Frequency–Time-Domain Spread Multi-Carrier DS-CDMA Systems

Multiuser channel estimation for CDMA systems over frequency-selective fading channels

Equalization with oversampling in multiuser CDMA systems

MMSE equalization of downlink CDMA channel utilizing unused orthogonal spreading sequences