An Automatically Controlled Predistorter for Multilevel Quadrature Amplitude Modulation
An Automatically Controlled Predistorter for Multilevel Quadrature Amplitude Modulation
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DOI:
10.1109/tcom.1983.1095870
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发表时间:
1983-05
期刊:
影响因子:
--
通讯作者:
J. Namiki
中科院分区:
文献类型:
--
作者:
J. Namiki
In digital microwave transmission, the nonlinear characteristics in a high power amplifier, such as a TWT (traveling-wave tube) inhibit efficient output use. This note introduces a new predistorter control technique, and assesses the nonlinear compensation capability of a third-order predistorter incorporating this technique. Concerning 16-QAM (quadrature amplitude modulation) a 10 dB reduction in out-of-band emission and larger than 8 dB C/N improvement with respect to symbol error rate can be achieved at 3 dB TWT average output power backoff.