High bandwidth efficient spread spectrum modulation using chirp waveform
First Claim
1. A high bandwidth efficient method for spread spectrum modulation using a chirp waveform, comprising the steps of:
- (a) encoding an information data signal, the encoded signal having a plurality of symbols encoded at a symbol rate, each symbol having a symbol duration;
(b) splitting the information data signal into a plurality of parallel information data signals using a serial to parallel converter;
(c) generating a plurality of orthogonal chirp waveforms which are orthogonal in frequency;
(d) modulating said plurality of parallel information data signals with said plurality of orthogonal chirp waveforms in order to produce a plurality of parallel information data signals modulated on orthogonal chirp waveforms;
(e) combining said plurality of plurality of parallel information data signals modulated on orthogonal chirp waveforms to produce a combined waveform; and
(f) transmitting said combined waveform.
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Abstract
A high bandwidth efficient spread spectrum modulation using chirp waveform. The invention provides a method and apparatus for effecting the high bandwidth efficient spread spectrum modulation using chirp waveform. The method involves reducing the data rate by narrowing the bandwidth or by using a smaller set of orthogonal sequences. The apparatus includes a transmitter and a receiver. The transmitter includes an encoder, an interleaver, a serial to parallel convertor, a baseband modulator that modulates the original bits onto each orthogonal sequence, and IF modulation. The receiver includes a down converter, an analog to digital converter, digital correlators, a synchronizer, a parallel to serial convertor, a deinterleaver, and a decoder.
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Citations
14 Claims
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1. A high bandwidth efficient method for spread spectrum modulation using a chirp waveform, comprising the steps of:
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(a) encoding an information data signal, the encoded signal having a plurality of symbols encoded at a symbol rate, each symbol having a symbol duration;
(b) splitting the information data signal into a plurality of parallel information data signals using a serial to parallel converter;
(c) generating a plurality of orthogonal chirp waveforms which are orthogonal in frequency;
(d) modulating said plurality of parallel information data signals with said plurality of orthogonal chirp waveforms in order to produce a plurality of parallel information data signals modulated on orthogonal chirp waveforms;
(e) combining said plurality of plurality of parallel information data signals modulated on orthogonal chirp waveforms to produce a combined waveform; and
(f) transmitting said combined waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A high bandwidth efficient spread spectrum modulation system using a chirp waveform, comprising:
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(a) at least one transmitter having;
(i) an encoder for encoding an information data signal;
(ii) an interleaver connected to said encoder for interleaving the information data signal;
(iii) a serial to parallel convertor connected to said interleaver for converting said information data signal into a plurality of parallel information data signals;
(iv) a plurality of stored orthogonal sequences, each sequence defining a chirp waveform;
(v) modulation means for modulating said plurality of orthogonal sequences with said plurality of parallel information data signals;
(vi) a combiner connected to said modulation means for combining said modulated parallel information data signals in order to define a combined signal; and
(vii) means for transmitting said combined signal; and
(b) at least one receiver having;
(i) means for receiving said combined signal;
(ii) at least one storage device having said plurality of orthogonal sequences stored therein;
(iii) demodulation means for demodulating said combined signal using the plurality of orthogonal sequences stored in said storage device (iv) a parallel to serial converter connected to said demodulation means;
(v) a deinterleaver connected to said parallel to serial converter for deinterleaving the demodulated serial signal; and
(vi) a decoder connected to said de-interleaver for decoding the received signal in order to reproduce the information data signal. - View Dependent Claims (14)
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Specification