Multiple access coding for radio communication

INDIVIDUAL INFORMATION SIGNALS CODED WITH A COMMON ERROR LOCK CODE NA UNICA DISRUPTING SCREEN, OR TUNING SEQUENCE, TAKEN FROM A GROUP OF DISRUPTING SCREENS THAT HAVE BEEN SELECTED IN AN APPROPRIATE CORRELATION. THE GROUP OF DISTURBING FREQUENCY BANDS IS SELECTED IN SUCH A WAY THAT THE CORRELATION BETWEEN THE KEY MODULE OF THE BLOCKING CODE IS A CONSTANT MAGNITUDE, INDEPENDENT FROM THE MASKING SCREENS, BOTH INDIVIDUALLY AND IN GROUP. IN A REPRESENTATION, WHEN ONE OF THE TWO SCREENS IS ADDED USING THE WALSH ANSFORMATION MODULE OF THAT SUM IT RESULTS A WALSH SPECTRUM THAT IS FULLY FLAT. FOR CELLULAR RADIO TELEPHONE SYSTEMS USING DIFFERENTIATED CDMA DEMODULATION TECHNIQUES, A DOUBLE INPUT ENCRYPTION SYSTEM, ALLOWS THE CELLULAR SYSTEM TO BE SECURED BY USING A DEEUALLY DEVAILED KEYS TO SELECT ONE OF THE DEPARTMENTS ENPARTICULAR CELL. IN ADDITION THE SECRET OF INDIVIDUAL CORRESPONDENTS, IS SECURED USING AN ENCRYPTION KEY, GENERATED PSEUDO-RANDOMIZALLY, TO ENCRYPT INDIVIDUAL SIGNALS BEFORE THE DISTURBATION OPERATION.