Coherent averaging for measuring traveling wave tube amplifier nonlinearity
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;
demodulating, in the receiver, the signal;
generating, in the receiver, an ideal signal from the demodulated signal;
coherently averaging, in the receiver, the received signal to reduce noise; and
estimating the performance characteristic for the traveling wave tube amplifier from a difference between the ideal signal and the coherently averaged 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 demodulated. An ideal signal is generated from the demodulated signal. The received signal is coherently averaged to reduce noise. The performance characteristic is the estimated TWTA nonlinearity from a difference between the coherently averaged ideal signal and received signal.
229 Citations
22 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; demodulating, in the receiver, the signal; generating, in the receiver, an ideal signal from the demodulated signal; coherently averaging, in the receiver, the received signal to reduce noise; and estimating the performance characteristic for the traveling wave tube amplifier from a difference between the ideal signal and the coherently averaged received signal for use in a layered modulation scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for measuring a transmission performance characteristic for a traveling wave tube amplifier, comprising:
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(a) a demodulator, in a receiver, for demodulating a received signal that has been transmitted from a satellite; (b) a signal generator, in the receiver, for producing an ideal signal from the demodulated signal; and (c) a processor, in the receiver, for; (i) coherently averaging the received signal to reduce noise; and (ii) estimating the performance characteristic for the traveling wave tube amplifier from a difference between the ideal signal and the coherently averaged received signal for use in a layered modulation scheme. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification