DETERMINATION OF THE SPECTRUM OF A CARRIER PHASE-MODULATED BY A BI-PHASE SUBCARRIER
Abstract
IT WAS DESIRED TO OBTAIN THE SPECTRUM OF A BIPHASE SUBCARRIER, THAT SWITCHES PHASE EVERY BIT PERIOD, PHASE-MODULATING A CARRIER. Much information on system requirements can be obtained from this spectrum. The condition described above implies the worst case with regard to bandwidth. As will be seen, the minimum IF bandwidth is twice the sum of the subcarrier frequency and one-half the switching frequency. It will also be seen that components beyond the third harmonic are appreciably small and may be neglected. The means of mechanizing the above system, important waveforms, the power spectrum of the bi- phase subcarrier, and the relative magnitudes of the phase modulator output are shown. The derivation of the latter is given.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 25, 1963
- Accession Number
- AD0296415
Entities
People
- R. Chin
- S. Ginsburg