Noiselike amplitude and phase modulation coding for spread spectrum transmissions
First Claim
Patent Images
1. Means for providing a signal having noiselike amplitude and phase modulation coding for spread spectrum applications comprising:
- at least a first plurality of pseudo noise generators, each of which generates a predetermined noiselike code signal;
a source of data;
first means for adding said data to each said noiselike code signal to produce a first plurality of data modulated noiselike signals;
a second plurality of pseudo noise generators, each of which generates a predetermined noiselike code signal;
means for generating a first carrier frequency;
means for shifting the phase angle of said carrier frequency by 90 degrees to provide a second carrier frequency;
second means for adding said data to each said noiselike code signal from said second plurality of pseudo noise generators to provide a second plurality of data modulated noiselike signals;
means for summing said first plurality of signals to provide a first sum signal,means for summing said second plurality of signals to provide a second sum signal;
means for mixing said first carrier frequency with said first sum signal to generate an in-phase signal component,means for mixing said second carrier frequency with said second sum signal to generate a quadrature signal component; and
,means for combining said in-phase signal component with said quadrature signal signal component.
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Abstract
A plurality of binary pseudo noise generators are used to develop a Gaussian code that appears thermal noiselike in both amplitude and phase. Half of the pseudo noise generators are provided in an in-phase section and half in a quadrature section, with each said generator output being mixed with data to be transmitted and applied to modulate a carrier, the outputs from the various sections being combined for transmission. A receiver having the same number of pseudo noise generators and generating the same code synchronously demodulates the received data.
78 Citations
10 Claims
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1. Means for providing a signal having noiselike amplitude and phase modulation coding for spread spectrum applications comprising:
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at least a first plurality of pseudo noise generators, each of which generates a predetermined noiselike code signal; a source of data; first means for adding said data to each said noiselike code signal to produce a first plurality of data modulated noiselike signals; a second plurality of pseudo noise generators, each of which generates a predetermined noiselike code signal; means for generating a first carrier frequency; means for shifting the phase angle of said carrier frequency by 90 degrees to provide a second carrier frequency; second means for adding said data to each said noiselike code signal from said second plurality of pseudo noise generators to provide a second plurality of data modulated noiselike signals; means for summing said first plurality of signals to provide a first sum signal, means for summing said second plurality of signals to provide a second sum signal; means for mixing said first carrier frequency with said first sum signal to generate an in-phase signal component, means for mixing said second carrier frequency with said second sum signal to generate a quadrature signal component; and
,means for combining said in-phase signal component with said quadrature signal signal component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification