Cart (Loading....) | Create Account
Close category search window
 

Optimum Binary FSK for Transmitted Reference Systems Over Rayleigh Fading Channels

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Bershad, N. ; Dept. of Electr Eng.,Univ. of California, Irvine, CA

It is well known that in communicating over randomly time-varying channels, a receiver which performs a channel measurement can make a better decision than one that does not. Furthermore, if the channel characteristics vary relatively slowly in comparison to a large number of adjacent message intervals, a small portion of the transmittter energy can be devoted to channel measurement, and, in spite of the loss of energy in the information bearing portion of the signal, the resulting system performs better than one with no measurement. This paper shows that improved system performance from a channel measuring system occurs, even when the channel characteristics are fixed only during the present message interval. The randomly time-varying channel studied is that of a Rayleigh fading medium with independently fading mark and space channels whose fading is fixed over one baud interval but is independent from baud to baud. The transmission system is a modified frequency shift keying (FSK) system such that during a portion of a baud interval, the mark and space frequencies are always transmitted so as to act as reference signals. For this system, the following has been established: 1) optimum receiver configuration 2) optimum ratio α of information energy to total signal energy as a function of total available SNR for a single fading channel. 3) asymptotic optimum α for anM-diversity channel 4) error probabilities for item 2 and asymptotic error probabilities for item S for αoptas a function of total SNR. The asymptotic results show that by using reference techniques the order of diversity is effectively doubled.

Published in:

Communication Technology, IEEE Transactions on  (Volume:14 ,  Issue: 6 )

Date of Publication:

December 1966

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.