System and method for spreading and de-spreading a signal at an antenna
First Claim
1. A direct spatial antenna modulation (DSAM) system comprising:
- a radiating structure comprising a plurality of spatial points of origination; and
a control system, wherein the control system is connected to the radiating structure via N spatial points of origination, wherein N is equal to or greater than 2, and wherein the control system is configured to perform operations comprising;
receiving a modulated signal;
splitting the modulated signal into N signals;
receiving segments of a pseudo-random noise (PN) coded sequence; and
for each segment of the PN coded sequence;
adjusting an amplitude of each of the N signals in response to the segment of the PN coded sequence;
assigning a spatial point of origination to each of the N signals in response to the segment of the PN coded sequence; and
simultaneously applying each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N.
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Accused Products
Abstract
A system and method for spreading and de-spreading a signal at an antenna. A Direct Spatial Antenna Modulation (DSAM) system makes use of the spatial characteristics of a radiating antenna structure to directly alter a signal transmitted or received by the radiating structure. When used for transmitting data, a data stream maps a signal to different spatial points of excitation in the antenna structure, where each chosen configuration has different radiating characteristics including phase, amplitude, and polarization, which can be used to represent data symbols. A code spreading sequence is applied to switch the output of the DSAM antenna to spatial points in the antenna to spread an input signal. The code spreading sequence is applied to an antenna to de-spread a previously spread signal. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this Abstract.
33 Citations
21 Claims
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1. A direct spatial antenna modulation (DSAM) system comprising:
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a radiating structure comprising a plurality of spatial points of origination; and a control system, wherein the control system is connected to the radiating structure via N spatial points of origination, wherein N is equal to or greater than 2, and wherein the control system is configured to perform operations comprising; receiving a modulated signal; splitting the modulated signal into N signals; receiving segments of a pseudo-random noise (PN) coded sequence; and for each segment of the PN coded sequence; adjusting an amplitude of each of the N signals in response to the segment of the PN coded sequence; assigning a spatial point of origination to each of the N signals in response to the segment of the PN coded sequence; and simultaneously applying each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. A direct spatial antenna modulation (DSAM) system comprising:
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an antenna structure comprising a plurality of spatial points of origination; and a control system, wherein the control system is connected to the antenna structure via N spatial points of origination, wherein N is equal to or greater than 2, and wherein the control system is configured to perform operations comprising; synchronizing with a pseudo-random noise (PN) coded sequence used to generate a signal of interest, wherein the PN coded sequence comprises one or more segments; and for each segment of the PN coded sequence; using the segment of the PN coded sequence to select one or more spatial points of origination; receiving signals from the one or more selected spatial points of origination; using the segment of the PN coded sequence to determine an amplitude adjustment factor for each received signal; and applying the amplitude adjustment factor to each of the received signals to obtain the signal of interest. - View Dependent Claims (8, 9, 10, 20, 21)
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12. A method of operating a radiating structure to emit a signal comprising:
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receiving a modulated signal; splitting the modulated signal into N signals, wherein N is equal to or greater than 2; receiving segments of a pseudo-random noise (PN) coded sequence; and for each segment of the PN coded sequence; adjusting an amplitude of each of the N signals in response to the segment of the PN coded sequence; assigning one of N spatial points of origination of the radiating structure to each of the N signals in response to the segment of the PN coded sequence; and simultaneously applying each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of operating a communications device comprising:
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receiving a pseudo-random noise (PN) coded sequence used to generate a signal of interest; synchronizing with the PN coded sequence used to generate the signal of interest, wherein the PN coded sequence comprises one or more segments; for each segment; using the segment of the PN coded sequence to select one or more spatial points of origination; receiving signals from the one or more selected spatial points of origination; using the segment of the PN coded sequence to determine an amplitude adjustment factor for each received signal; and applying the amplitude adjustment factor to each of the received signals to obtain the signal of interest. - View Dependent Claims (19)
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Specification