Private branch radio communication system using optical fibers

Claim 2

A private branch radio communication system characterized by comprising: a portable radio transmitter (1) for modulating a signal and outputting the modulated signal as a radio signal in a first area within a given premises; a first repeater means (2), located in the first area, for receiving the radio signal transmitted from said radio transmitter (1) and outputting an optical signal corresponding to the signal received; an optical transmission medium (5) for transmitting the optical signal output from said first repeater to a second area within said premises; a second repeater means (3), located in the second area, for receiving the optical signal output from said first repeater means (2) and transmitted by said optical transmission medium, and generating a radio signal corresponding to the signal received in the second area; and a portable radio receiver (4) for receiving the radio signal output from said second repeater (3) in the second area and demodulating the signal received.

Claim 3

A system according to claim 1, characterized in that said portable radio transmitter (1) outputs a radio signal having a field intensity allowing the signal to be received in any part of the first area.

Claim 4

A system according to claim 1, characterized in that said second repeater means (3) outputs a radio signal having a field intensity allowing the signal to be received in any part of the second area.

Claim 5

A system according to claim 1, characterized in that said first and second repeater means (2, 3) are located in the first and second areas, respectively.

Claim 6

A system according to claim 1, characterized in that said first repeater means (2) includes a receiving antenna (10) and an electrical/optical converting means (12) for converting a radio signal received by said receiving antenna (10) into an optical signal.

Claim 7

A system according to claim 1, characterized in that said second repeater means (3) includes an optical/electrical converting means (13) for converting an optical signal transmitted through said optical transmission medium (5) into an electrical signal, and a transmitting antenna (15) for outputting, as a radio signal, the electrical signal output from said optical/electrical converting means (13) in the second area.

Claim 8

A private branch radio communication system characterized by comprising: a first portable radio transceiver (21) for modu­lating a signal and generating the modulated signal as a radio signal in a first area within a given premises, and for receiving the radio signal generated in the first area and demodulating the signal received; a second portable radio transceiver (24), for modu­lating a signal and generating the modulated signal as a radio signal in a second area within said premises, and for receiving the radio signal generated in the second area and demodulating the signal received; an optical transmission medium (5A, 5B) for coupling the first and second areas to each other; a first two-way repeater means (22), arranged in the first area, for receiving the radio signal output from said radio transceiver (21) and supplying an opti­cal signal corresponding to the signal received to said optical transmission medium (5A, 5B) and for receiving an optical signal transmitted through said optical transmission medium (5A, 5B) and generating a radio signal corresponding to the signal received in the first area; and a second two-way repeater means (23), arranged in the second area, for receiving the optical signal output from said first repeater means (22) and transmitted through said optical transmission medium (5A, 5B), and generating a radio signal corresponding to the signal received in the second area and for receiving the radio signal output from said radio transceiver (24) and supplying an optical signal corresponding to the signal received to said optical transmission medium (5A, 5B).

Claim 9

A private branch radio communication system characterized by comprising: a first portable radio transceiver (21) for modu­lating a signal and generating the modulated signal as a radio signal in a first area within a given premises, and for receiving the radio signal generated in the first area and demodulating the signal received; a second portable radio transceiver (24), for modu­lating a signal and generating the modulated signal as a radio signal in a second area within said premises, and for receiving the radio signal generated in the second area and demodulating the signal received; an optical transmission medium (5A, 5B) for coupling the first and second areas to each other; a first two-way repeater means (22), arranged in the first area, for receiving the radio signal output from said radio transceiver (21) and supplying an opti­cal signal corresponding to the signal received to said optical transmission medium (5A, 5B) and for receiving an optical signal transmitted through said optical transmission medium (5A, 5B) and generating a radio signal corresponding to the signal received in the first area; and a second two-way repeater means (23), arranged in the second area, for receiving the optical signal output from said first repeater means (22) and transmitted through said optical transmission medium (5A, 5B), and generating a radio signal corresponding to the signal received in the second area and for receiving the radio signal output from said radio transceiver (24) and supplying an optical signal corresponding to the signal received to said optical transmission medium (5A, 5B).

Claim 10

A system according to claim 7, characterized in that said first portable radio transceiver (21) out­puts a radio signal having a field intensity allowing the signal to be received in any part of the first area.

Claim 11

A system according to claim 7, characterized in that said second portable radio transceiver (24) outputs a radio signal having a field intensity allowing the signal to be received in any part of the second area.

Claim 12

A system according to claim 7, characterized in that said first two-way repeater means (22) outputs a radio signal having a field intensity allowing the signal to be received in any part of the first area.

Claim 13

A system according to claim 7, characterized in that said second two-way repeater means (23) outputs a radio signal having a field intensity allowing the signal to be received in any part of the second area.

Claim 14

A system according to claim 7, characterized in that said first and second two-way repeaters (22, 23) are located in the first and second areas, respec­tively.

Claim 15

A system according to claim 7, characterized in that said first two-way repeater means (22) includes a transmitting/receiving antenna (22C), electrical/­optical signal converting means (22A) for converting a radio signal received by said transmitting/receiving antenna (22C) into an optical signal, and optical/­electrical signal converting means (22B) for converting, into an electrical signal, an optical signal transmitted through said optical transmission medium (5A, 5B) and supplying the electrical signal to said transmitting/­receiving antenna (22C).

Claim 16

A system according to claim 7, characterized in that said second two-way repeater means (23) includes a transmitting/receiving antenna (23C), electrical/­optical signal converting means (23A) for converting a radio signal received by said transmitting/receiving antenna (23C) into an optical signal, and optical/­electrical signal converting means (23B) for converting, into an electrical signal, an optical signal transmitted through said optical transmission medium (5A, 5B) and supplying the electrical signal to said transmitting/­receiving antenna (23C).

Claim 17

A private branch radio communicating system characterized by comprising: a plurality of portable radio transceivers (Ka1 - Ke1); a plurality of two-way repeater means (Ra - Re), distributed throughout a plurality of areas (P11 - P15) within a given premises, for receiving radio signals generated in the respective areas where the repeater means are distributed and supplying optical signals cor­responding to the signals received to a first optical transmission medium (30a - 30e), and for receiving opti­cal signals input through a second optical transmission medium (31a - 31e) and generating radio signals corre­sponding to the signals received in the respective areas; and optical signal multiplexing means (32) for multi­plexing the optical signals output from said plurality of two-way repeater means (Ra - Re) and supplied through said first optical transmission medium (30a - 30e), and supplying the multiplexed optical signal to said plu­rality of two-way repeater means (Ra - Re) through said second optical transmission medium (31a - 31e).

Claim 18

A private branch radio communicating system characterized by comprising: a plurality of portable radio transceivers (Ka1 - Ke1); a plurality of two-way repeater means (Ra - Re), distributed throughout a plurality of areas (P11 - P15) within a given premises, for receiving radio signals generated in the respective areas where the repeater means are distributed and supplying optical signals cor­responding to the signals received to a first optical transmission medium (30a - 30e), and for receiving opti­cal signals input through a second optical transmission medium (31a - 31e) and generating radio signals corre­sponding to the signals received in the respective areas; and optical signal multiplexing means (32) for multi­plexing the optical signals output from said plurality of two-way repeater means (Ra - Re) and supplied through said first optical transmission medium (30a - 30e), and supplying the multiplexed optical signal to said plu­rality of two-way repeater means (Ra - Re) through said second optical transmission medium (31a - 31e).

Claim 19

A system according to claim 15, characterized in that said plurality of portable radio transceivers (Ka1 - Ke1) are distributed throughout said plurality of areas (P11 - P15).