Accession Number:

AD0258998

Title:

CHANNEL UTILIZATION BY INTERMITTENT TRANSMITTERS

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s):

Report Date:

1961-05-12

Pagination or Media Count:

1.0

Abstract:

The usual method of allocating spectrum space to various users does not take into account the extent to which the allocations are actually utilized. If only a fraction of the transmitters are simultaneously active, calculation of the possible signaling rates, assuming mutually interfering operation, shows that better methods of spectrum utilization certainly exist if the fraction is small enough, and some systems can be implemented to retain a portion of this advantage while reducing the coding problem to manageable proportions. By studying the theoretical limit of channel utilization, however, it is shown that in fact better utilization is possible if the active fraction of the transmitters is merely less than one. The limit of channel utilization is studied by postulating a model of a band-limited, noisy channel that incorporates the feature of random selection of a subset of transmitters to be multiplexed within the bandwidth. It is shown by a random coding argument that sets of waveforms certainly exist that can provide operation without interference for any finite number of transmitters assigned to the channel, provided only that the total information transmitted by any subset of transmitters be appropriate for the signal powers involved. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE