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US 7,068,738 B2Granted
FQPSK-B viterbi receiver
AssigneeCalifornia Institute of Technology
InventorsDennis K. Lee, Marvin K. Simon, Tsun-Yee Yan
Life of this patent
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Abstract
An FQPSK-B receiver uses a simplified trellis system which uses combinations of FQPSK-B waveforms to correlate against an input signal. This enables reduction of the number of correlators that are used and the number of comparisons that are made by the correlators.
Claims20
A receiver, comprising:
- a plurality of averaged waveforms, each said averaged waveform comprising an average of a plurality of FQPSK waveforms;
- a plurality of correlators, to correlate an input signal with each of said averaged waveforms of said plurality to form correlations;
- and
- a trellis decoder using said correlations to make decisions on the transmitted signals.
1 more element
A method, comprising:
- obtaining a plurality of basic waveforms which represent trellis waveforms for FQPSK or FQPSK-B;
- averaging groups of said plurality of waveforms to form averaged waveforms, wherein a number of said averaged waveforms is less than a number of said plurality of waveforms;
- and
- correlating an FQPSK-B input signal against said averaged waveforms to form a group of signals to be processed by a trellis decoder.
1 more element
A receiver, comprising:
- a filter element, receiving an input PQPSK-B signal and producing a filtered FQPSK-B signal;
- and
- a Viterbi Algorithm receiver, producing demodulated signals based on said FQPSK-B input signals, wherein said Viterbi Algorithm receiver compares said filtered FQPSK-B signal with a plurality of averaged signals.
A method of receiving an FQPSK-B signal, comprising:
- obtaining a plurality of basic FPQSK-B signals associated with modulation of an FQPSK-B signal;
- averaging said plurality of basic FQPSK-B signals to form a plurality of averaged signals;
- and
- comparing an input coded FQPSK-B signal with said plurality of averaged signals to carry out the modulation.
1 more element
Dependencies are inferred from the claim text.