Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1986-03-19
1987-10-13
Laroche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
330149, H03C 308
Patent
active
047001518
ABSTRACT:
In a modulation system responsive to a system input signal for supplying an amplifier having nonlinearities with a modulated analog signal to make the amplifier produce an amplified output signal, the system input signal conveys a baseband signal having a predetermined sampling rate for reproduction and is sampled into a sequence of sampled signals having a specific rate higher than the predetermined sampling rate. The sampled signal sequence is converted by a random access memory into a sequence of predistorted signals which compensate for the nonlinearities and which are modulated into the modulated analog signal. Each predistorted signal is adaptively modified at the specific rate with reference to the sampled signals and an additional input signal derived from the amplified output signal. When the sampled signal sequence is sampled at the predetermined sampling rate, the predistorted signal sequence may be produced by interpolating each of the sampled signals at the specific rate. The baseband signal may be either a digital signal or an analog one.
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
LaRoche Eugene R.
NEC Corporation
Pascal Robert J.
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