Linear FM Signal Formats for Beacon and Communication Systems
- 1 July 1974
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Aerospace and Electronic Systems
- Vol. AES-10 (4), 471-478
- https://doi.org/10.1109/taes.1974.307800
Abstract
This paper examines the capabilities of the class of linear FM spread-spectrum signals within the context of potential communications systems usage in order to establish some performance criteria and bounds that permit comparison with other spread-spectrum formats. A systematic basis is provided for parameter selection for this class of signals by examining the interaction a mong the frequency-modulation indices, time-bandwidth product, and cross-talk criteria that determine the number of effective linear FM signals (or channels) that can be used within the constraints of a bounded time-frequency region. A general expression is derived relating N, the number of useful signals, R2, a cross-talk parameter, ToWo, the mean time-bandwidth product, and μμmax and μmin, the maximum and minimum FM rates of the signal set. Canonic signal processor structures are described for ensembles of linear FM signals that have either constant duration or constant bandwidth. It is then shown that the signal modulation format can be modified in accordance with classical paired-echo theory to expand the utility of this class of signals in both synchronous and nonsynchronous operations to yield the equivalent of time-division and code multiplexing. Possible applications for this signal format are discussed.Keywords
This publication has 2 references indexed in Scilit:
- On the Potential Advantage of a Smearing-Desmearing Filter Technique in Overcoming Impulse-Noise Problems in Data SystemsIEEE Transactions on Communications, 1961
- The Interpretation of Amplitude and Phase Distortion in Terms of Paired EchoesProceedings of the IRE, 1939