US 5,862,221 A · Scramble wireless communication system

Abstract

As for wireless communication lines between a master station and a plurality of remote stations, each remote station has a function F having an unitary variable which is known over all the stations and has two unique IDs, respectively. The master station is provided with a remote station ID memory circuit which outputs one ID of a remote station when the other ID of the remote station is input thereto, and a scrambler. carries out scrambling by using a fixed scramble vector VO during a setup sequence period and using a scramble vector VF set from a master station control circuit at the time of data transmission. A descrambler descrambles an input signal from the remote station by using the scramble vector VO during the setup sequence period and using a scramble vector VR set from the master station control circuit at the time of data transmission.

Claims8

Dependent claims

A scramble wireless communications system which has a scrambler in each station on a transmitter side and a descrambler in each station on a receiver side in order to maintain privacy of data on wireless communication lines between a master station and a plurality of remote stations, said system comprising:

a remote station among a plurality of said remote stations which starts communication with said master station comprising:
a selecting means for selecting either of unique first and second identification codes,
a first scramble code determining means which determines a scramble code of said scrambler of said remote station using a predetermined unitary function with said first identification code selected by said selecting means and determines a descramble code of said descrambler of said remote station using said predetermined unitary function with said second identification code selected by said selecting means, and
a transmitting means for transmitting said selected identification code to said master station;
and
said master station comprising:
a second scramble code determining means for determining scramble codes of said scrambler and said descrambler of said master station which restore the scramble codes of said scrambler and said descrambler of said master station on the basis of said first identification code received from said remote station by using said predetermined unitary function in accordance with all the previously stored unique first and second identification codes of a plurality of said remote stations.

4 more elements

A scramble wireless communication system which performs a setup sequence processing for transmitting and/or receiving information (referred to as an SU hereinbelow) required for the communication and has each remote station having unique two identification codes (referred to as IDs hereinbelow) when communicating between a master station and a remote station, said system characterized by that:

said master station comprises a remote station ID memory circuit which stores each ID of all the remote stations and outputs one ID of any remote station when the other ID of the remote station is input thereto;
a control circuit which performs generation/decoding and transmission/reception of the SU used during a setup sequence period, produces a scramble vector VF by using a function F from one ID supplied from a remote station through the SU to set the VF in a scrambler, outputs the ID from the remote station to a remote station ID memory circuit, receives the other ID from the remote station ID memory, and set a scramble vector VR from the function F with the received ID as a variable to set the VR in a descrambler;
a scrambler for scrambling an input signal by using a fixed scramble vector VO during the setup sequence period and using the scramble vector VF set from the control circuit during data communication period;
and
a descrambler for descrambling a signal supplied from a remote station by using the scramble vector VO during the setup sequence period and using the scramble vector VR set from the control circuit during data communication period.

2 more elements

Dependencies are inferred from the claim text.

Scramble wireless communication system

Life of this patent

Scramble wireless communication system

Life of this patent

Abstract

Claims8