Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | IEEE Xplore Digital Library |
---|---|
Author | Imoto, T. Suehiro, N. |
Copyright Year | 1998 |
Description | Author affiliation: Fac. of Eng., Soka Univ., Tokyo, Japan (Imoto, T.) |
Abstract | Power control or interference cancellation requires a heavy cost for the uplink in mobile CDMA systems. Suehiro (1993, 1994) proposed a 4-phase signal design for approximately synchronized CDMA systems without co-channel interference. In the proposed 4-phase signal design, each user is assigned a carrier frequency, some 4-phase sequence of finite length with pseudo-periodic property and comb-shaped spectrum, and a matched filter for the central large part of the assigned sequence. When the assigned sequence of the comb-shaped spectrum is modulated by the carrier the obtained signal has a comb-shaped spread spectrum. The carriers are assigned to each user so that any two of the users have an orthogonal comb-spectrum to each other. Because each user has a filter which is matched to the central part of the assigned sequence, no user receives co-channel interference near the main detection pulse under the condition of approximate synchronization. The Doppler effect and the multipath properties are simulated. When the carrier frequencies are about 2000 MHz, the signals works almost without co-channel interference under the Doppler shift at 1000 km/h. This result of simulation shows the usefulness of the 4-phase signal design without co-channel interference for an approximately synchronized uplink in cellular CDMA systems. |
Starting Page | 507 |
Ending Page | 511 |
File Size | 378125 |
Page Count | 5 |
File Format | |
ISBN | 078034281X |
DOI | 10.1109/ISSSTA.1998.723836 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 1998-09-04 |
Publisher Place | South Africa |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Signal design Interchannel interference Multiaccess communication Frequency synchronization Matched filters Power control Interference cancellation Costs Spread spectrum communication Doppler effect |
Content Type | Text |
Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
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 |
Loading...
|