RADIO MODEM Russian patent published in 2012 - IPC H04L9/08 

FIELD: radio engineering.

SUBSTANCE: device comprises an analogue-digital converter (1), interfaces (2, 4, 14, 22, 27, 43, 46), a control unit (3), codecs (7, 51, 52, 53, 54, 55), antenna feeder units (5, 34), commutators (6, 9, 11, 33, 44), summators (8, 10, 41, 42), a packet device (12), a transmitting unit (13), frequency synthesisers (15, 21, 56, 47), registers (16, 17, 18, 19, 23, 29, 40, 49, 50), a generator of code sequences (20), units of cryptoprotection (24, 25, 38, 39), a clock pulse oscillator (26), shift registers (28, 57), an amplifying converter unit (30), a phased locked loop unit (31), a receiving unit (32), a unit of signal element identification (35), k comparison circuits (36₁ 36_k), a multiplexer (37), a digital to analogue converter (45), a comparator (48). In the device a packet is formed, transmitted and received, containing cryptographically protected information, using a combination code determined by the first and second pseudorandom numbers (PRN1 and PRN2) and synchrosequence, besides, every of two parts of the packet is modulated by different frequencies determined by the PRN2.

EFFECT: provision of safe mode of operation with self-recovery of a radio network with packet transfer of data consisting of mobile subscribers in case of passive enemy attacks.

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