NASA Scientific and Technical Aerospace Reports

Each of the clusters informs a different way of looking at the world and thus a different perspective of how communication
is valued. People had different yet legitimate ideas of the purpose of communication in their partnership. Surprisingly, process
rules about communication were rarely considered and as a result the partnership meetings were neither participative nor
collaborative. Little interaction occurred and no decisions were made.
DTIC
Decision Making; Embedding
20040111746 Stanford Research Inst., Arlington, VA
Detection of a PSK Signal Transmitted Through a Hard-Limited Channel
Jain, Pravin C.; Blachman, Nelson M.; Sep. 1973; 8 pp.; In English
Report No.(s): AD-A425952; No Copyright; Avail: CASI; A02, Hardcopy
This paper considers the problem of the detection of a binary phase-modulated carrier which has been transmitted along
with noise through a hard-limiting repeater, corrupted by additional noise, and demodulated by cross correlation and sampling
at the receiver. Three equivalent expressions are obtained for the error probability of the receiver output. Two of these
expressions take the form of an infinite series involving either confluent hypergeometric functions or modified Bessel
functions. A third form allows representation of the error probability in terms of Rice’s le function. The model for the
communication system to be considered in this paper is shown in Fig. 1. A binary phase-shift-keyed (PSK) signal is assumed
to get from the transmitter to the receiver via a hard-limiting repeater in the transmission channel. Additive Gaussian noise
is introduced on both the uplink (repeater noise) and the downlink (receiver noise).
DTIC
Phase Shift; Phase Shift Keying; Repeaters; Signal Detection; Telecommunication
20040112019 Analex Corp., Brook Park, OH, USA
IMT-2000 Satellite Standards with Applications to Mobile Air Traffic Communications Networks
Shamma, Mohammed A.; [2004]; 11 pp.; In English; ICNS 2004, 27-29 Apr. 2004, Fairfax, VA, USA
Contract(s)/Grant(s): WBS 727-01-01; No Copyright; Avail: CASI; A03, Hardcopy
The International Mobile Telecommunications - 2000 (IMT-2000) standard and more specifically the Satellite component
of it, is investigated as a potential alternative for communications to aircraft mobile users en-route and in terminal area. Its
application to Air Traffic Management (ATM) communication needs is considered. A summary of the specifications of
IMT-2000 satellite standards are outlined. It is shown via a system research analysis that it is possible to support most air traffic
communication needs via an IMT-2000 infrastructure. This technology can compliment existing, or future digital aeronautical
communications technologies such as VDL2, VDL3, Mode S, and UAT.
Author
Air Traffıc Control; Mobile Communication Systems; Communication Networks
20040120873 Texas Univ., Arlington, TX, USA
Links to the Future: The Role of Information and Telecommunications Technology in Appalachian Economic
Development: 2004 Update
Oden, M.; Strover, S.; Inagaki, N.; Lucas, C.; Jun. 2004; In English
Report No.(s): PB2004-107374; No Copyright; Avail: National Technical Information Service (NTIS)
This study updates parts of the analysis found in the ‘Links to the Future’ report published in June 2002. This update
focuses on analyzing the changes in access to advanced information technologies and telecommunications services over the
2001-2003 period. We also review changes in the policy environment that have occurred over this period and highlight federal
and state level legislative proposals that may have important implications for future deployment of advanced information and
telecommunications infrastructure (ICT) services. To better understand patterns of growth and change affecting ICT
infrastructure in the Appalachian region, this report updates key measures of access and use of ICT across the region. The most
current data available is used to update key telecommunications infrastructure measures in the tables, figures and maps from
the ‘Links to the Future’ report of June 2002. Fast-paced changes in the character and deployment of the technologies have
been accompanied by changes and adjustments in regulatory and investment policies by the various government levels. This
report details prominent Federal Communications Commission (FCC) rulings, congressional legislation, and actions by state
governments in the Appalachian Regional Commission (ARC) region related to cable modem, Digital Subscriber Lines (DSL)
and other high-speed telecommunications services.
NTIS
Telecommunication; Information Systems
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