Methods and systems for secure wireless communication within a predetermined boundary
First Claim
1. A method of secure wireless communication of a message signal within a predetermined boundary, the method comprising the steps of:
- encoding the message signal using a preselected code to generate an encoded signal;
transmitting a radio frequency signal representative of the encoded signal; and
transmitting a code signal representative of the preselected code, wherein propagation of the code signal is confined within the predetermined boundary.
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Accused Products
Abstract
A message signal which is to be securely communicated is encoded, using a preselected code, to generate an encoded signal. A radio frequency signal representative of the encoded signal is transmitted, wherein the radio frequency signal may propagate beyond the predetermined boundary. A code signal representative of the preselected code is also transmitted, wherein propagation of the code signal is confined within the predetermined boundary. At a corresponding receiver within the predetermined boundary, the code signal and the radio frequency signal are received. The encoded signal represented by the radio frequency signal is decoded based upon the preselected code in order to recover the message signal.
76 Citations
39 Claims
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1. A method of secure wireless communication of a message signal within a predetermined boundary, the method comprising the steps of:
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encoding the message signal using a preselected code to generate an encoded signal; transmitting a radio frequency signal representative of the encoded signal; and transmitting a code signal representative of the preselected code, wherein propagation of the code signal is confined within the predetermined boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of secure wireless communication of a message signal within a predetermined boundary defined by at least one wall, a floor, and a ceiling, the method comprising the steps of:
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encoding the message signal using a preselected pseudo-random digital key to generate an encoded signal, the message signal encoded by a code-division multiple access scheme; transmitting a radio frequency signal representative of the encoded signal, the radio frequency signal propagating beyond the predetermined boundary; and transmitting a code signal representative of the preselected pseudo-random digital key, the code signal selected from the group consisting of an infrared light signal, an ultraviolet light signal, and an ultrasonic signal, wherein propagation of the code signal is confined by the predetermined boundary.
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14. A method of receiving a secure, wireless communication of a message signal, the method comprising the steps of:
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receiving a code signal selected from the group consisting of a light signal and an ultrasonic signal, the code signal representative of a preselected code; receiving a radio frequency signal representative of an encoded signal; and decoding the encoded signal based upon the preselected code to recover the message signal. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of receiving a secure, wireless communication of a message signal, the method comprising the steps of:
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receiving a code signal representative of a preselected pseudo-random digital key, the code signal selected from the group consisting of an infrared light signal, an ultraviolet light signal, and an ultrasonic signal; storing the pseudo-random digital key; receiving a radio frequency signal representative of an encoded signal; and decoding the encoded signal to recover the message signal, the encoded signal demodulated in accordance with a code-division multiple access scheme using the pseudo-random digital key.
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21. A system for secure wireless communication of a message signal within a predetermined boundary, the system comprising:
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an encoder which encodes the message signal using a preselected code, the encoder generating an encoded signal; a first transmitter which transmits a radio frequency signal representative of the encoded signal; and a second transmitter which transmits a code signal representative of the preselected code, wherein propagation of the code signal is confined within the predetermined boundary. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for secure wireless communication of a message signal within a predetermined boundary defined by at least one wall, a floor, and a ceiling, the system comprising:
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a code-division multiple access encoder which encodes the message signal using a preselected pseudo-random digital key, the encoder generating an encoded signal; a first transmitter which transmits a radio frequency signal representative of the encoded signal, the radio frequency signal propagating beyond the predetermined boundary; and a second transmitter which transmits a code signal representative of the preselected pseudo-random digital key, the code signal selected from the group consisting of an infrared light signal, an ultraviolet light signal, and an ultrasonic signal, wherein propagation of the code signal is confined within the predetermined boundary.
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33. A system for receiving a secure, wireless communication of a message signal, the system comprising:
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a first receiver which receives a radio frequency signal representative of an encoded signal; a second receiver which receives a code signal representative of a preselected code, the code signal selected from the group consisting of a light signal and an ultrasonic signal; and a decoder which decodes the encoded signal based upon the preselected code, whereby the decoder recovers the message signal. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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Specification