Permission-based TDMA chaotic communication systems

A method for selectively controlling access to multiple data streams which are communicated from a first communication device using a timeslotted shared frequency spectrum and shared spreading codes, comprising the steps of:

• performing discrete-time modulation processes using at least two protected data signals including protected data to form at least two first modulated signals;
• performing a numerical sequence generation process to generate first chaotic spreading codes;
• combining the first modulated signals with respective ones of said first chaotic spreading codes to form digital chaotic signals having spread spectrum formats;
• additively combining the digital chaotic signals to form a composite protected data communication signal;
• time division multiplexing the composite protected data communication signal with a global data communication signal including global data to form an output communication signal;
• and
• transmitting said output communication signal from the first communication device over a communications channel;
• wherein different values for a sequence location parameter for said numerical sequence generation process are used during a first pre-defined duration and a second pre-defined duration to generate at least one of said first chaotic spreading codes, said first and second pre-defined durations equal to a duration of a TDM frame or a timeslot;
• wherein different parameters for at least one of said discrete-time modulation processes are used during said first-defined duration and said second pre-defined duration to generate at least one of said first modulated signals;
• and
• wherein different values for at least one of a polynomial equation parameter and an N-tuple of moduli parameter are used for said numerical sequence generation process during said first pre-defined duration and said second pre-defined duration to generate at least one of said first chaotic spreading codes.

A method for selectively controlling access to multiple data streams which are communicated from a first communication device using a timeslotted shared frequency spectrum and shared spreading codes, comprising the steps of:

• performing discrete-time modulation processes using at least two protected data signals including protected data to form at least two first modulated signals;
• performing a numerical sequence generation process to generate first chaotic spreading codes:
• combining the first modulated signals with respective ones of said first chaotic spreading codes to form digital chaotic signals having spread spectrum formats;
• additively combining the digital chaotic signals to form a composite protected data communication signal;
• modulating a global data signal to form a second modulated signal;
• combining the second modulated signal with a second chaotic spreading code to form the global data communication signal having a spread spectrum format;
• time division multiplexing the composite protected data communication signal with said global data communication signal including global data to form an output communication signal;
• and
• transmitting said output communication signal from the first communication device over a communications channel;
• wherein different values for a sequence location parameter for said numerical sequence generation process are used during a first pre-defined duration and a second pre-defined duration to generate at least one of said first chaotic spreading codes, said first and second pre-defined durations equal to a duration of a TDM frame or a timeslot;
• wherein different parameters for at least one of said discrete-time modulation processes are used during said first-defined duration and said second pre-defined duration to generate at least one of said first modulated signals;
• and
• wherein an amplitude-and-time-discrete modulation process is selected from the group comprising an M-ary phase shift keying modulation process, a quadrature amplitude modulation process and an amplitude shift keying modulation process.

A communication system configured for selectively controlling access to multiple data streams which are communicated using a timeslotted shared frequency spectrum and shared spreading codes, comprising:

• a first modulator configured to perform discrete-time modulation processes using at least two protected data signals including protected data to form at least two first modulated signals;
• a first sequence generator configured to perform a numerical sequence generation process to generate first chaotic spreading codes;
• a first combiner configured to combine the first modulated signals with respective ones of said first chaotic spreading codes to form digital chaotic signals having spread spectrum formats;
• a second combiner configured to additively combine the digital chaotic signals to form a composite protected data communication signal;
• a multiplexer configured to time division multiplex the composite protected data communication signal with a global data communication signal including global data to form an output communication signal;
• and
• a transceiver configured to transmit said output communication signal from a first communication device to a second communication device over a communications channel;
• wherein different values for a polynomial equation parameter for said numerical sequence generation process are used by said first generator during a first pre-defined duration and a second pre-defined duration to generate at least one of said first chaotic spreading codes, said first and second pre-defined duration equal to a duration of a TDM frame or a timeslot;
• and
• wherein different parameters for at least one of said discrete-time modulation processes are used during said first-defined duration and said second pre-defined duration to generate at least one of said first modulated signals.

A communication system configured for selectively controlling access to multiple data streams which are communicated using a timeslotted shared frequency spectrum and shared spreading codes, comprising:

• a first modulator configured to perform discrete-time modulation processes using at least two protected data signals including protected data to form at least two first modulated signals;
• a first sequence generator configured to perform a numerical sequence generation process to generate first chaotic spreading codes;
• a first combiner configured to combine the first modulated signals with respective ones of said first chaotic spreading codes to form digital chaotic signals having spread spectrum formats;
• a second combiner configured to additively combine the digital chaotic signals to form a composite protected data communication signal;
• a multiplexer configured to time division multiplex the composite protected data communication signal with a global data communication signal including global data to form an output communication signal;
• and
• a transceiver configured to transmit said output communication signal from a first communication device to a second communication device over a communications channel;
• wherein different values for a sequence location parameter for said numerical sequence generation process are used by said first generator during a first pre-defined duration and a second pre-defined duration to generate at least one of said first chaotic spreading codes, said first and second pre-defined duration equal to a duration of a TDM frame or a timeslot;
• wherein different parameters for at least one of said discrete-time modulation processes are used during said first-defined duration and said second pre-defined duration to generate at least one of said first modulated signals;
• and
• wherein different values for at least one of a polynomial equation parameter and an N-tuple of moduli parameter are used for said numerical sequence generation process during said first pre-defined duration and said second pre-defined duration to generate at least one of said first chaotic spreading codes.