Download or read book A window random access algorithm for environments with capture written by Daniel F. Lyons and published by . This book was released on 1987 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In packet radio environments, where users are independent and bursty, the deployment of Random Access transmission Algorithms, (RAAs), is recommendable. Those algorithms are implemented by each user independently, they are insensitive to changing user population, and they induce low delays. Several such algorithms have been proposed, and generally analyzed in idealistic, (noiseless and with no propagation delays), environments, and subject to the assumptions that when simultaneous transmission is then necessary, and that a single transmission is involved packets is lost and retransmission is then necessary, and that a single transmission is always received correctly. In realistic packet radio environments, however, several phenomena occur. Specifically, atmospheric noise, forward propagation delays, and multipath fading are present. Due to the atmospheric noise and the multipath fading, single transmissions are not always received correctly by the receiver. In addition, the differential forward propagation delays may be used beneficially, to allow locking in and thus capture of some packet, when simultaneous transmissions occur.

Download or read book A random access algorithmn for environments with capture and limited feedback capabilities written by P. Papantoni-Kazakos and published by . This book was released on 1988 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Random Access Algorithm for Environments with Capture and Limited Feedback Capabilities written by P. Papantoni-Kazakos and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: We consider synchronous packet radio systems, deploying spread-spectrum encoding. In such systems, capture events occur, where in the presence of k simultaneous packet transmissions, a single packet is captured with probability P(k). We adopt the case where P(k) = p q to the (k-1) power, k = or> 1, for some system probabilities p and q, where ternary feedback per slot is available, where in the event of capture the identity of the captured packet is not revealed, and where capture in the presence of a single packet transmission and capture in the presence of multiple transmissions are not distinguishable events. For the above system, we present and analyze a full sensing window random access algorithm. Due to the system model considered, the algorithm inevitably induces losses. Its performance characteristics are the fraction of lost traffic and the per successfully transmitted packet expected delays. We compute the values of those characteristics, for various values of the system and the algorithmic parameters, and for the limit Poisson user model. The algorithm can attain low delays while simultaneously inducing relatively few losses.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Signal Processing for Mobile Communications Handbook written by Mohamed Ibnkahla and published by CRC Press. This book was released on 2004-08-16 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, a wealth of research has emerged addressing various aspects of mobile communications signal processing. New applications and services are continually arising, and future mobile communications offer new opportunities and exciting challenges for signal processing. The Signal Processing for Mobile Communications Handbook provi

Download or read book Proceedings Exhibition future Access written by and published by . This book was released on 1999 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1987-11 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book IEEE International Conference on Personal Wireless Communications written by and published by . This book was released on 1999 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Communications ICC 2000 written by IEEE Communications Society and published by IEEE Standards Office. This book was released on 2000-06 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Communication Systems written by S. P. Yeo and published by . This book was released on 1990 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Conference on Information Sciences and Systems written by and published by . This book was released on 1988 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Science Abstracts written by and published by . This book was released on 1993 with total page 2332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wireless LANs and Bluetooth written by Yang Xiao and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless Local Area Network (LAN) and Bluetooth are two phenomena in wireless networks. They have become very successful in the current market and are deployed in many different environments. However, there are still many unresolved issues such as Mobility Management support, Quality of Service (QoS) support, etc. The primary focus of this book is to present these two hot and rapidly evolving areas as well as issues and solutions involved with them. It is this realisation that has motivated the editing of this book. The goal of the book is to serve as a reference for wireless LAN and Bluetooth. In this book, the authors review important developments and new strategies for these topics. Important features and limitations of methods and models are identified. Consequently, this book can serve as a useful reference for researchers, educators, graduate students, as well as practitioners in the field of wireless networks.

Download or read book Use of Services for Family Planning and Infertility United States 1982 written by Gerry E. Hendershot and published by . This book was released on 1988 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1982 statistics on the use of family planning and infertility services presented in this report are preliminary results from Cycle III of the National Survey of Family Growth (NSFG), conducted by the National Center for Health Statistics. Data were collected through personal interviews with a multistage area probability sample of 7969 women aged 15-44. A detailed series of questions was asked to obtain relatively complete estimates of the extent and type of family planning services received. Statistics on family planning services are limited to women who were able to conceive 3 years before the interview date. Overall, 79% of currently mrried nonsterile women reported using some type of family planning service during the previous 3 years. There were no statistically significant differences between white (79%), black (75%) or Hispanic (77%) wives, or between the 2 income groups. The 1982 survey questions were more comprehensive than those of earlier cycles of the survey. The annual rate of visits for family planning services in 1982 was 1077 visits /1000 women. Teenagers had the highest annual visit rate (1581/1000) of any age group for all sources of family planning services combined. Visit rates declined sharply with age from 1447 at ages 15-24 to 479 at ages 35-44. Similar declines with age also were found in the visit rates for white and black women separately. Nevertheless, the annual visit rate for black women (1334/1000) was significantly higher than that for white women (1033). The highest overall visit rate was for black women 15-19 years of age (1867/1000). Nearly 2/3 of all family planning visits were to private medical sources. Teenagers of all races had higher family planning service visit rates to clinics than to private medical sources, as did black women age 15-24. White women age 20 and older had higher visit rates to private medical services than to clinics. Never married women had higher visit rates to clinics than currently or formerly married women. Data were also collected in 1982 on use of medical services for infertility by women who had difficulty in conceiving or carrying a pregnancy to term. About 1 million ever married women had 1 or more infertility visits in the 12 months before the interview. During the 3 years before interview, about 1.9 million women had infertility visits. For all ever married women, as well as for white and black women separately, infertility services were more likely to be secured from private medical sources than from clinics. The survey design, reliability of the estimates and the terms used are explained in the technical notes.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1992 with total page 1228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to IEEE Publications written by Institute of Electrical and Electronics Engineers and published by . This book was released on 1990 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1973- cover the entire IEEE technical literature.