Extended cordless telephone system

• US 5,115,463 A
• Filed: 06/25/1990
• Issued: 05/19/1992
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: David Moldavsky, Robert L. Stone
• Original Assignee: David Moldavsky, Robert L. Stone
• Inventors: Stone, Robert L., Moldavsky, David
• Primary Examiner(s): Dwyer, James L.
• Assistant Examiner(s): Bost, Dwayne D.
• Application Number:
  US07/543,010
• Time in Patent Office: 694 Days
• Field of Search: 379/58, 379/61, 379/63, 379/59, 455/80, 455/81, 455/103, 455/55
• US Class Current: 455/465
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

An extended cordless telephone system for communicating information signals from a plurality of telephone lines through a telephone exchange, including a central station and a plurality of remote units. The plurality of remote units may be radio telephone handsets, data sets, and the like. The central station includes a plurality of transceivers, a power combiner, a duplexer, a power divider, and a plurality of radiax cables. The plurality of transceivers transmits and receives the information signals as ACSB signals. Alternatively, the plurality of transceivers may transmit and receive the information signals as spread spectrum signals, using frequency hopping and FSK modulation. The power combiners include a plurality of combiner striplines for impedence matching the plurality of transceivers to an output of the power combiner.

Claims

1. An extended phone service system for communicating information signals from a plurality of telephone lines through a telephone exchange to a plurality of remote units, comprising:

central station communicating signals to and from the plurality of telephone lines, said central station including,

a plurality of transceivers for transmitting and receiving the information signals as amplitude companded sideband (ACSB) signals;

a power combiner coupled to said plurality of transceivers, said power combiner including a plurality of combiner striplines with each combiner stripline transforming an input impedance by a ratio of 1;

2 to an output impedance, said plurality of combiner striplines connected for combining the ACSB signals outputted from said plurality of transceivers with impedance matching to an output of said power combiner, by having at least an output of a first combiner stripline and an output of a second combiner stripline coupled to an input of a third combiner stripline,

a duplexer, with a transmitter port coupled to the output of said power combiner, with a receiver port coupled to said plurality of transceivers, and with an antenna port;

a power divider with a first port coupled to the antenna port of said duplexer, and a plurality of divided ports, said power divider including a plurality of divider striplines with each stripline transforming a first port impedance by a ratio of 2;

1 to a second port impedance, said plurality of divider stripline connected with at least a first divider stripline with a first port coupled to the antenna port of said duplexer and a second port coupled to a first port of a second divider stripline and a first port of a third divider stripline;

a plurality of isolators coupled between each of said transceivers and each of said combiner striplines coupled to each of said transceivers, respectively, for isolating power outputted from said transceivers;

a plurality of linear amplifiers coupled between each of said transceivers and each of said isolators coupled to each of said transceivers, respectively, for amplifying power outputted from said transceivers; and

a plurality of radiax cables coupled to said plurality of divided ports for radiating the ACSB signals to and receiving the ACSB signals from said plurality of remote units.

2. The extended phone service system as set forth in claim 1, further comprising:

a plurality of high Q filters is coupled between each of said transceivers and each of said isolators coupled to each of said transceivers, respectively, for filtering power outputted from said transceivers.

3. The extended phone service as set forth in claim 2 wherein said high Q filter is a helical resonator, and said isolator is a ferrite isolator.

4. An extended phone having an system for communicating information signals from a plurality of communication lines through a local exchange to a plurality of remote units, comprising:

a plurality of transmitter means having amplitude companded sideband (ACSB) modulator coupled to said local exchange, for transmitting information signals as ACSB signals;

a power combiner coupled to said plurality of transmitter means, said power combiner including a plurality of combiner striplines connected for combining power outputted from said plurality of transmitters to an output of said power combiner;

isolator means coupled between each of said transmitter means and each of said combiner striplines coupled to each of said transmitter means, respectively, for isolating power outputted from said transmitter means;

a plurality of high Q filters coupled between each of said transmitter means and each of said isolator means coupled to each of said transmitter means, respectively, for filtering power outputted from said transmitter means; and

at least one radiax cable coupled to the output of said power means for radiating the ACSB signals to said plurality of remote units.

5. The extended phone service as set forth in claim 4 wherein said high Q filter is a helical resonator, and said isolator means is a ferrite isolator.

6. The extended phone service system as set forth in claim 4, wherein said power combiner includes a plurality of combiner striplines with each combiner stripline transforming an input impedance by a ratio of 1:

2 to an output impedance, said plurality of combiner striplines connected for combining power outputted from said plurality of transmitter means with impedance matching to an output of said power combiner, by having at least an output of a first combiner stripline and an output of a second combiner stripline coupled to an input of a third combiner stripline.

7. The extended phone service system as set forth in claim 4, further comprising:

divider means with a first port coupled to the output port of said power combiner, and a plurality of divider ports, said divider means including a plurality of divider striplines with each stripline transforming a first port impedance by a ratio of 2;

1 to a second port impedance, said plurality of divider striplines connected with at least a first divider stripline with a first port coupled to the output port of said power means and a second port coupled to a first port of a second divider stripline and a first port of a third divider stripline; and

a plurality of radiax cables coupled to said plurality of divider ports for radiating signals to said plurality of remote units.

8. The extended phone service system as set forth in claim 4, further comprising:

a plurality of linear amplifiers with each of said plurality of linear amplifiers coupled between each of said transmitter means and each of said isolator means coupled to each of said transmitter means, respectively, for amplifying power outputted from said transmitter means.

9. The extended phone service system as set forth in claim 4, further comprising:

a plurality of receiver means for receiving the ACSB signals; and

a duplexer, with a transmitter port coupled to the output of said power combiner, with a receiver port coupled to said plurality of receivers, and with an antenna port.

10. An extended phone service system for communicating digital-information signals from a plurality of communication lines to a plurality of remote units, comprising:

a control processor;

packet means for generating packet data signals from a plurality of digital-information signals and a control data signal;

a plurality of transmitter means, each transmitter means responsive to a control signal from said control processor for transmitting and frequency hopping on a plurality of frequencies, the packet data signals as communication data signals;

a power combiner coupled to said plurality of transmitter means, said power combiner including a plurality of combiner striplines connected for combining power outputted from said plurality of transmitter means to an output of said power combiner;

a plurality of isolators coupled between each of said transmitters and each of said combiner striplines coupled to each of said transmitters, respectively, for isolating power outputted from said transmitters;

a plurality of high Q filters coupled between each of said transmitters and each of said isolators coupled to each of said transmitters, respectively, for filtering power outputted from said transmitters; and

at least one radiax cable coupled to the output of said power combiner for radiating the frequency hopping signals to said plurality of remote units.

11. The extended phone service system as set forth in claim 10, further comprising:

a first plurality of receivers for receiving remote-data signals transmitted from said remote units;

a duplexer, with a transmitter port coupled to the output of said power combiner, with a receiver port coupled to said plurality of receivers, and with an antenna port coupled to said radiax cable; and

a second plurality of receivers for monitoring the plurality of frequencies, and responsive to an interfering signal interfering on at least one of the plurality of frequencies, for generating a nonavailability signal; and

wherein said control processor, responsive to the nonavailability signal, reassigns the frequency with the interfering signal at the plurality of transmitter means to a noninterfered frequency with no interference, of the plurality of frequencies.

12. The extended phone service system as set forth in claim 10, further comprising:

cyclic-redundancy-check (CRC) means coupled to said packet means and responsive to each of the packet data signals for generating a data CRC data and multiplexing the CRC data to each of the packet data signals, respectively;

error detection means located at said remote unit, responsive to the CRC data of each packet data signal, for detecting data errors and generating an error signal; and

means coupled to said control processor and responsive to the error signal for retransmitting the packet data signal having an error.

13. The extended phone service as set forth in claim 10 wherein said high Q filter is a helical resonator, and said isolator is a ferrite isolator.

14. The extended phone service system as set forth in claim 10, wherein said power combiner includes a plurality of combiner striplines with each combiner stripline transforming an input impedance by a ratio of 1:

2 to an output impedance, said plurality of combiner striplines connected for combining power outputted from said plurality of transmitters with impedance matching to an output of said power combiner, by having at least an output of a first combiner stripline and an output of a second combiner stripline coupled to an input of a third combiner stripline.

15. The extended phone service system as set forth in claim 10, further comprising:

a power divider with a first port coupled to the output port of said power combiner, and a plurality of divider ports, said power divider including a plurality of divider striplines with each stripline transforming a first port impedance by a ratio of 2;

1 to a second port impedance, said plurality of divider striplines connected with at least a first divider stripline with a first port and a second divider stripline with a first port coupled to the output port of said power combiner; and

a plurality of radiax cables coupled to said plurality of divider ports for radiating signals to said plurality of remote units.

16. The extended phone service system as set forth in claim 10, further comprising:

a plurality of receivers for receiving remote-data signals transmitted from said remote units; and

a duplexer, with a transmitter port coupled to the output of said power combiner, with a receiver port coupled to said plurality of receivers, and with an antenna port.