Secure anti-jamming wireless party line
First Claim
1. A wireless party line for radiotelecommunications, comprising:
- at least two radio-telephones, each programmed with an identifying code word for inclusion in each of its transmissions and with a common identifying code word for reception of transmissions from other sources;
a fixed wireless repeater capable of receiving telephonic communications from a plurality of radio-telephones within its radio coverage, each with its unique identifying code word, and capable of retransmitting by radio each of said telephonic communications to a plurality of mobile radio-telephones simultaneously using a common identifying code word;
whereby said fixed wireless repeater provides a party line by means of which each mobile radio-telephone receives all retransmitted communications from said wireless mobile radio-telephones.
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Accused Products
Abstract
A secure wireless party line system that can be used by a group of mobile users to communicate with each other like a wired party line but without the cumbersome inconvenience of long wired tether. The party line function is achieved by the use of a fixed wireless repeater. The fixed wireless repeater receives spread spectrum transmissions from all N mobile users at a frequency f1, and passes the received signals through an RF amplifier and upconverter, and then to an IF amplifier and power divider, which converts the received signals down to a convenient intermediate frequency (IF), and feeds N receive spread spectrum processors, each dedicated to receive a coded spread spectrum transmission from one user. The received voice outputs from the N users are then combined in a N-channel voice data multiplexer, and broadcast at a frequency f2 to all users with a common spread spectrum code word added by a transmit spread spectrum processor. The commonly coded broadcast messages are processed by an RF amplifier and broadcast at frequency f2. All mobile radio receivers receive on the same common code word used by the fixed wireless repeater for broadcasting. Each mobile user on said party line carries a simple single channel radio transceiver. Spread spectrum transmission provides security and anti-jamming performance. Analog and digital embodiments are disclosed.
35 Citations
12 Claims
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1. A wireless party line for radiotelecommunications, comprising:
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at least two radio-telephones, each programmed with an identifying code word for inclusion in each of its transmissions and with a common identifying code word for reception of transmissions from other sources; a fixed wireless repeater capable of receiving telephonic communications from a plurality of radio-telephones within its radio coverage, each with its unique identifying code word, and capable of retransmitting by radio each of said telephonic communications to a plurality of mobile radio-telephones simultaneously using a common identifying code word; whereby said fixed wireless repeater provides a party line by means of which each mobile radio-telephone receives all retransmitted communications from said wireless mobile radio-telephones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification