Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1996-12-16
1999-08-03
Le, Thanh Cong
Telecommunications
Transmitter
Plural separate transmitters or channels
455 63, 455115, 375296, H04B 1700
Patent
active
059337664
ABSTRACT:
A multi-channel transmit amplifier array comprising a multiplicity N of coupled power amplifier elements is disclosed. The number of channels provided for amplifying desired signals for transmission is less than N, by at least one. In this case, the unused channel is used to inject an intermodulation compensation waveform specifically tailored to reduce intermodulation generated in all of the other N-1 signal paths. Instantaneous complex waveform values for the intermodulation compensation waveform may be systematically computed from the instantaneous complex values of the N-1 desired signals in such a way as to minimize the greatest signal amplitude in any of the N signal paths.
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K. Yamamoto et al., "High Output Port Isolation and Low Intermodulation Distortion Multi-Port-Amplifier," Proceedings of the European Microwave Conference, Finland, Aug. 24-27, 1992, pp. 1137-1142.
Cong Le Thanh
Ericsson Inc.
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