Patent ID: 8385385

Claim:
A method for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and a shared spreading code, comprising the steps of: forming a global data communication signal by amplitude modulating a global data signal comprising global data symbols; forming a phase modulated signal by phase modulating a data signal including protected data symbols; forming a protected data communication signal by changing phase angles of said protected data symbols by a variable angle Ø and combining said phase modulated signal with a spreading sequence; combining said global data communication signal and said protected data communication signal to form an output communication signal which has a spread spectrum format, which concurrently includes both said global data communication signal and said protected data communication signal, and is arranged to permit access to the global data symbols by all authorized users of said output communication signal, and to control access to the protected data symbols so that said protected data symbols are accessible to less than all of said authorized users; and transmitting said output communication signal over a communications channel.