Intermodulation Analysis of FDMA Satellite Systems Employing Compensated and Uncompensated TWT's
- 1 May 1982
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications
- Vol. 30 (5) , 1233-1242
- https://doi.org/10.1109/tcom.1982.1095568
Abstract
In a frequency-division multiple-access (FDMA) satellite communication system, the output power of the TWT (or FET) amplifier is backed from saturation to reduce the intermodulation distortion caused by AM/AM and AM/PM nonlinearities. The required amount of backoff can be considerable, wasting valuable satellite power, unless some scheme is used to compensate for these nonlinearities. A comparative study is presented for the effectiveness of three types of predistortion compensators: (1) a cuber predistortion linearizer, which is the simplest to build; (2) an AM/PM equalizer; and (3) an ideal linearizer, which is quite difficult to realize in practice.Keywords
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