Scheduled System Maintenance:
Some services will be unavailable Sunday, March 29th through Monday, March 30th. We apologize for the inconvenience.
By Topic

Some Fundamental Considerations concerning Noise Reduction and Range in Radar and Communication

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)
Goldman, S. ; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Mass.

A general analysis based upon information theory and the mathematical theory of probability is used to investigate the fundamental principles involved in the transmission of signals through a background of random noise. Three general theorems governing the probability relations between signal and noise are proved, and one is applied to investigate the effect of pulse length and repetition rate on radar range. The concept of "generalized selectivity" is introduced, and it is shown how and why extra bandwidth can be used for noise reduction. It is pointed out that most noise-improvement systems are based upon coherent repetition of the message information either in time or in the frequency spectrum. It is also pointed out why more powerful noise-improvement systems should be possible than have so far been made. The general mechanism of noise-improvement thresholds is discussed, and it is shown how they depend upon the establishment of a coherence standard. The reason for and the limitation of the apparent law that the maximum operating range of a communications system, for a given average power, is independent of the type of modulation used is then explained. General ways in which improvements in range of radar and communication systems may be made are also discussed. The possibility of using extra bandwidth to reduce distortion is pointed out. Finally, some possible relations of this work to biology and psychology are described.

Published in:

Proceedings of the IRE  (Volume:36 ,  Issue: 5 )