NDLI: Multiuser diffuse indoor wireless infrared communication using equalized synchronous CDMA

Content Provider	IEEE Xplore Digital Library
Author	Griner, U.N. Arnon, S.
Copyright Year	1972
Abstract	We propose an indoor wireless infrared downlink scheme for high-data-rate multiuser connectivity with diffuse channels. The scheme is based on synchronous code-division multiple access with unipolar Hadamard codes. The orthogonality of unipolar Hadamard codes enables multiuser operation with relatively short codes. Thus, practical downlink rates of tens of Mb/s for each user can be obtained. However, multipath reflections in diffuse channels cause strong multipath dispersion and, consequently, severe distortion. This distortion becomes even more severe in a multiuser environment, as the dispersed incoherent infrared radiation of all users aggregates together. To mitigate this distortion, we use a novel adaptive multilevel serial composite decision feedback and feedforward equalizer. We investigate the system's performance with the proposed equalizer, and compare it with the performance of the same system, both composite decision-feedback and feedforward equalizers, and with a conventional decision-feedback equalizer (DFE). Our results show that the proposed scheme enables a high-data-rate multiaccess link and eliminates most of the multiuser distortion. Furthermore, it improves system performance in a multiaccess environment, as compared with the other composite equalizers and DFE for the same complexity. We also compare other coding schemes, and show that Hadamard codes are on top of the other codes
Starting Page	1654
Ending Page	1662
Page Count	9
File Size	651946
File Format	PDF
ISSN	00906778
Volume Number	54
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Optical fiber communication Code division multiplexing Error correction Error correction codes Decision feedback equalizers Downlink System performance Multiaccess communication Reflection optical code-division multiple access (OCDMA) Decision-feedback equalizer (DFE) decision feedforward equalizer indoor wireless communication infrared (IR) communication multiaccess communication
Content Type	Text
Resource Type	Article
Subject	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

Tentative chip decision-feedback equalizer for multicode wideband CDMA

Iterative Multiuser Detection for Underwater Acoustic Channels

An efficient soft-in-soft-out multiuser detector for synchronous CDMA with error-control coding

Synchronous DS-CDMA downlink with frequency selective fading

Decorrelating decision-feedback multiuser detector for synchronous code-division multiple-access channel

Uniform Cross-Correlation Modified Prime Code for Applications in Synchronous Optical CDMA Communication Systems

On error-correction coding for CDMA PON

On the design of uplink and downlink group-orthogonal multicarrier wireless systems

Estimation and equalization of fiber-wireless uplink for multiuser CDMA 4G networks

Multiuser diffuse indoor wireless infrared communication using equalized synchronous CDMA

Similar Documents

Tentative chip decision-feedback equalizer for multicode wideband CDMA

Iterative Multiuser Detection for Underwater Acoustic Channels

An efficient soft-in-soft-out multiuser detector for synchronous CDMA with error-control coding

Synchronous DS-CDMA downlink with frequency selective fading

Decorrelating decision-feedback multiuser detector for synchronous code-division multiple-access channel

Uniform Cross-Correlation Modified Prime Code for Applications in Synchronous Optical CDMA Communication Systems

On error-correction coding for CDMA PON

On the design of uplink and downlink group-orthogonal multicarrier wireless systems

Estimation and equalization of fiber-wireless uplink for multiuser CDMA 4G networks

Multiuser diffuse indoor wireless infrared communication using equalized synchronous CDMA