System and method for modulating 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, wherein a unique data symbol is associated with one or more of the plurality of spatial points of origination;
a common feed point for receiving an excitation signal; and
a switching system responsive to a baseband data signal, wherein in response to the presence of the unique data symbol in the baseband data signal, the switching system directs the excitation signal to the one or more spatial points of origination associated with the particular unique data symbol, and wherein the one or more spatial points of origination associated with the unique data symbol determine a characteristic of a signal emitted by the radiating structure.
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Abstract
A Direct Spatial Antenna Modulation (DSAM) antenna structure makes use of the instantaneous electromagnetic field state of a radiating antenna structure to achieve direct modulation of a transmitted signal within the antenna. In contrast to existing amplitude and phase-only based digital modulation techniques, this innovative technique utilizes an inherent spatial modulation component, mapping data spatially to different locations in the antenna structure, where each location has different transmitting and receiving properties. This spatial component of the modulation can enable, for example, a unique increase in data transmission speed in a fixed spectral bandwidth with no increase in bit error rate over current phase and amplitude only modulation techniques. Additionally, the DSAM antenna structure affords important benefits in reduced hardware complexity, reduced supply current consumption, and relaxed amplifier linearity requirements. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this Abstract.
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Citations
15 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, wherein a unique data symbol is associated with one or more of the plurality of spatial points of origination; a common feed point for receiving an excitation signal; and a switching system responsive to a baseband data signal, wherein in response to the presence of the unique data symbol in the baseband data signal, the switching system directs the excitation signal to the one or more spatial points of origination associated with the particular unique data symbol, and wherein the one or more spatial points of origination associated with the unique data symbol determine a characteristic of a signal emitted by the radiating structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a characteristic of a signal using a radiating structure, wherein the radiating structure comprises a plurality of spatial points of origination, a switching system and a common feed point, the method comprising:
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associating a unique data symbol with one or more of the plurality of spatial points of origination; directing an excitation carrier signal to the common feed point; and applying a baseband data signal to the switching system, wherein in response to the presence of the unique data symbol in the baseband data signal, the switching system directs the excitation signal to the one or more spatial points of origination associated with the particular unique data symbol and wherein the one or more spatial points of origination associated with the unique data symbol determine a characteristic of a signal emitted by the radiating structure. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification