The sensitivity of high-level modulation schemes to channel nonlinearities in digital radio systems is investigated. The QAM schemes are less sensitive to nonlinearities when operated in the offset mode. Comparison of QAM and QPRS schemes reveals that the latter need a lower carrier to noise ratio (CNR) than corresponding QAM schemes for identical operating conditions. When the nonlinearities are not severe, the degradation in performance is controlled by AM/PM characteristic of the amplifier.
|Number of pages||4|
|Journal||Conference Record - International Conference on Communications|
|Publication status||Published - 1986 Dec 1|
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering