Patent ID: 8848909
Filing Date: 2014-09-30
Classification: H04K

Abstract:
1. 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 polynomial equation 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; 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.