By Topic

Adaptive threshold control scheme in a centralized packet radio network with common direct-sequence spread-spectrum modulation

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

2 Author(s)
Kim, I.-K. ; Univ. of Southern California, Los Angeles, CA, USA ; Scholtz, R.A.

The authors describe an automatic threshold control scheme for the detection of a header which is a frame synchronization word in an unslotted centralized packet radio network in which all communicators employ a common direct-sequence spread-spectrum modulation format. Adaptive threshold control is done by setting the header-detection threshold proportional to the maximum-likelihood estimate of the multiple-access noise level. The design value of false alarm probability determines the constant of proportionality under the assumption that the multiple-access noise is a complex Gaussian random process. Computer simulation is carried out to show that this Gaussian assumption is reasonably valid. This scheme yields a false alarm probability which is nearly invariant to the changes in the number of actual transmissions in the channel, and a detection efficiency essentially free of loss with respect to the ideal detection where the multiple access noise level is known to the receiver. Throughput bounds for an unslotted ALOHA system with this scheme are analyzed

Published in:

Signals, Systems and Computers, 1991. 1991 Conference Record of the Twenty-Fifth Asilomar Conference on

Date of Conference:

4-6 Nov 1991