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.
|ジャーナル||Conference Record - International Conference on Communications|
|出版ステータス||Published - 1986 12月 1|
ASJC Scopus subject areas
- コンピュータ ネットワークおよび通信