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Estimated Performance Of A Qprs Radio In The Presence Of Frequency Selective Fading

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Estimated Performance Of A Qprs Radio In The Presence Of Frequency Selective Fading

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Author : Stephen T. Matsuura
language : en
Publisher:
Release Date : 1981

Estimated Performance Of A Qprs Radio In The Presence Of Frequency Selective Fading written by Stephen T. Matsuura and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.

This report provides an estimation of the probability of outage of a QPRS radio (Aventek DR-8A) link in a multipath caused frequency selective fading environment. This performance estimation is based on: (a) A propagation channel model with transfer function of the form H(w) = a(1+b exp ( -j(wt+phi)), which has been derived from experimental data. (b) A laboratory simulation of the model with DR-8A radios to determine the range of values of the channel model parameters that degrade raio performance. (c) Assumed probability density functions for the channel model parameters (as random variables), based on sparse experimental data. The experimental data shows that: (a) Radio performance degradation begins (above the flat fade case) with delays (tau in the transfer function) in the order of a few nanoseconds. (b) Longer delays cause increased degradation. (c) For degradation to occur, the function minimum must occur within a few megahertz of the radio passband. The estimated probability of the fade outage (based on measured parameters of the DR-8A radio), indicate that: (a) The predicted outage for distances greater than 25 miles is higher than that predicted using flat fade methods. (b) Space diversity alone may not provide sufficient performance improvement at distances must beyond 30 miles, although the combination of space diversity and adaptive equalizer should be adequate for nearly all line-of-sight paths. (Author).

Technical Abstract Bulletin

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Author :
language : en
Publisher:
Release Date : 1981

Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.

Scattering And Propagation In Random Media

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Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Panel. Specialists' Meeting
language : en
Publisher:
Release Date : 1988

Scattering And Propagation In Random Media written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Panel. Specialists' Meeting and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Electromagnetic waves categories.

The topic of scattering and propagation in random media is one that has implications for the design, development and operation of most military systems that radiate energy as a means of accomplishing their funtion. Primary emphasis is on scattering and transmission in the atmosphere; however, other related random medium effects are not excluded. Modern methods of characterizing random media, mathematical methods and their applicability, effects on electromagnetic waves and the interpretation of these effects to specific system applications are described. The region of the spectrum considered is essentially unlimited and ranges from very long waves to optics. The performance of existing surveillance communication and navigation systems as well as the design of future systems is influenced by the propagation of energy via random media. An understanding of the nature of the medium and its impact on system design and performance is essential to the NATO community.

Performance Of Fh Qpsk Fh Qpr Fh Msk Under Frequency Selective Fading And Partial Band Tone Jamming

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Author : Fazal Noor
language : en
Publisher:
Release Date : 1986

Performance Of Fh Qpsk Fh Qpr Fh Msk Under Frequency Selective Fading And Partial Band Tone Jamming written by Fazal Noor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Phase modulation categories.