Equalization for traveling wave tube amplifier nonlinearity measurements
First Claim
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1. A method of measuring a transmission performance characteristic for a traveling wave tube amplifier, comprising:
- receiving, in a receiver, a signal transmitted from a satellite;
equalizing, in the receiver, the signal using a linear equalizer to restore nonlinearity;
demodulating, in the receiver, the equalized signal;
generating, in the receiver, an ideal signal from the demodulated equalized signal; and
estimating the performance characteristic of the traveling wave tube amplifier from a difference between the ideal signal and the received signal for use in a layered modulation scheme.
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Abstract
A method and system provide the ability to measure a transmission performance characteristic. A signal is received and equalized. The equalized signal is demodulated and an ideal signal is generated from the demodulated equalized signal. A performance characteristic is the estimated from a difference between the ideal signal and the equalized signal.
243 Citations
12 Claims
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1. A method of measuring a transmission performance characteristic for a traveling wave tube amplifier, comprising:
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receiving, in a receiver, a signal transmitted from a satellite; equalizing, in the receiver, the signal using a linear equalizer to restore nonlinearity; demodulating, in the receiver, the equalized signal; generating, in the receiver, an ideal signal from the demodulated equalized signal; and estimating the performance characteristic of the traveling wave tube amplifier from a difference between the ideal signal and the received signal for use in a layered modulation scheme. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for measuring a transmission performance characteristic for a traveling wave tube amplifier, comprising:
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(a) an equalizer in a receiver, for equalizing a received signal transmitted from a satellite; (b) a demodulator in the receiver, for demodulating the equalized signal; (c) a signal generator in the receiver, for producing an ideal signal from the demodulated equalized signal; and (d) a processor, in the receiver, for estimating the performance characteristic of the traveling wave tube amplifier from a difference between the ideal signal and the equalized signal for use in a layered modulation scheme. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification