Accession Number : AD0666915

Title :   DYNAMIC BANDWIDTH OF PHASE-MODULATED SIGNALS.

Descriptive Note : Rept. for Aug-Oct 67,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Rihaczek,A. W.

Report Date : FEB 1968

Pagination or Media Count : 30

Abstract : A method of signal representation is introduced which simplifies the analysis and provides a better understanding of systems using phase-modulated signals. To replace time function and spectrum, the concept of instantaneous frequency is supplemented by that of dynamic bandwidth. Instantaneous frequency indicates in which part of the spectrum the signal energy is concentrated at a particular time, whereas dynamic bandwidth measures the degree of concentration. The combination of both concepts reveals the nature of a phase-modulated signal in a manner in better agreement with physical intuition than time function and frequency spectrum. A signal with arbitrary phase modulation can be thought of as a succession of elementary constant-carrier pulses of varying duration; or, in the frequency domain, as a succession of spectral bands with linear phase and varying widths. It is shown that this approach permits one to write down results that would take a complicated analysis if conventional methods were used. (Author)

Descriptors :   (*PHASE MODULATION, RADIO SIGNALS), (*RADIO SIGNALS, BANDWIDTH), TIME, FREQUENCY MODULATION, FOURIER ANALYSIS, INTEGRAL TRANSFORMS, ELECTRIC FILTERS, PHASE LOCKED SYSTEMS, NOISE(RADIO)

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE