Use of Four-Level Phase Modulation for Digital Mobile Radio
- 1 November 1972
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electromagnetic Compatibility
- Vol. EMC-14 (4) , 113-128
- https://doi.org/10.1109/temc.1972.303214
Abstract
The paper explains the advantages of and compares various forms of four-level phase modulation from the point of view of performance, implementation, and spectrum usage. The results are applicable to digital mobile radio systems employing a large number of transmissions in which cochannel and adjacent channel interference are experienced. Of particular interest is the extent to which the theoretical spectra may be realized with practical transmitters. Differences between theoretical spectra and those measured from practical power amplifiers are identified. A method of simulating the effects of power amplifier nonlinearities is described and results are presented which agree closely with measurements made on an actual power amplifier.Keywords
This publication has 2 references indexed in Scilit:
- Application of fourier techniques to computer-aided design of electronic systemsProceedings of the Institution of Electrical Engineers, 1971
- Spectra of Digital FMBell System Technical Journal, 1965