Wireless telephone system
First Claim
1. A wireless system for telephone communication within a building comprising:
- (a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals,(b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels,(c) a leaky transmission line located in a communication region within the building,(d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region,(e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals within the building and for demodulating it into an intelligible signal, and(f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signal from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signal to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central RF demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a central synchronization and control circuit connected to all said interface means for receiving supervisory signal from the junctors and/or a bus of the PABX and for formulating polling and supervisory signal of predetermined format received from the wireless communication terminal corresponding thereto and for translating poll messages and supervisory signal of predefined format to supervisory signal and for applying the latter signal to the junctors and/or bus of the PABX, a supervisory channel spread spectrum modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signal, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
A wireless telephone communication system for wireless, voice, data or voice and data terminals comprising apparatus at a central location for receiving one or a plurality of signals for communication with selected ones of wireless communication terminals, apparatus for converting the signals to spread spectrum radio frequency signals, a leaky transmission line located in a communication region, apparatus for applying the spread spectrum radio frequency signals to the transmission line for electromagnetic radiation within the region, at least one wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals and for demodulating it into an intelligible signal.
297 Citations
26 Claims
-
1. A wireless system for telephone communication within a building comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals within the building and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signal from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signal to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central RF demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a central synchronization and control circuit connected to all said interface means for receiving supervisory signal from the junctors and/or a bus of the PABX and for formulating polling and supervisory signal of predetermined format received from the wireless communication terminal corresponding thereto and for translating poll messages and supervisory signal of predefined format to supervisory signal and for applying the latter signal to the junctors and/or bus of the PABX, a supervisory channel spread spectrum modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signal, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predefined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of a the PABX, a supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the transmit filter being connected to the input of the transmission line and the receive filter being connected to the output of the transmission line. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a data interface circuit connected to the former interface circuit for receiving and transmitting data signals from and to the associated junctor and/or data bus of the PABX, a data channel modulator having a fixed correlation code corresponding to the junctor connected to the data interface circuit for spread spectrum and RF modulating a data signal received therefrom and applying the RF modulating signal via the transmit filter to the leaky transmission line, a data channel demodulator having its input connected via the receiver filter to the leaky transmission line, and for applying a data signal to the data interface circuit for transmission to the junctor or PABX data bus, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or bus of the PABX and for formulating polling and supervisory signals of predefined format received from the wireless communication terminal corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of the PABX, a supervisory channel modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit.
-
-
17. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predetermined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of a the PABX, a supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel RF demodulator connected to the output of the receive band demodulator connected to the output of the receive bank limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the transmit filter being connected to the input of the transmission line and the receive filter being connected to the output of the transmission line, the frequency of the R.F. modulated signals being between approximately 150 MHz and 1000 MHZ.
-
-
18. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predetermined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of a the PABX, a supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the transmit filter being connected to the input of the transmission line and the receive filter being connected to the output of the transmission line, the frequency of the RF modulated signals being between approximately 150 MHz and 1000 MHZ, the transmission line being coaxial cable having a shield containing gaps sufficient to allow RF energy radiation therefrom.
-
-
19. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals within the building and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a data interface circuit connected to the former interface circuit for receiving and transmitting data signals from and to the associated junctor and/or data bus of the PABX, a data channel spectrum modulator having a fixed correlation code corresponding to the junctor connected to the data interface circuit for spread spectrum and RF modulating a data signal received therefrom and applying the RF modulated signal via the receive band limiting filter to the leaky transmission line, a data channel demodulator having its input connected via the receive band limiting filter to the leaky transmission line and for applying a data signal to the data interface circuit for transmission to the junctor or PABX data bus, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predefined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of the PABX, a supervisory channel modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal, and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the output of the transmit band limiting filter being connected to the input of the transmission line and the input to the receive band limiting filter being connected to the output of the transmission line. - View Dependent Claims (20, 21, 22, 23, 24)
-
-
25. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals within the building and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum analog and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a data interface circuit connected to the former interface circuit for receiving and transmitting data signals from and to the associated junctor and/or data bus of the PABX, a data channel modulator having a fixed correlation code corresponding to the junctor connected to the data interface circuit for spread spectrum and RF modulating a data signal received therefrom and applying the RF modulated signal via the transmit filter to the leaky transmission line, a data channel demodulator having its input connected via the receive filter to the leaky transmission line and for applying a data signal to the data interface circuit for transmission to the junctor or PABX data bus, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predefined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of the PABX, a supervisory channel modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal, and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the output of the transmit band limiting filter being connected to the input of the transmission line and the input to the receive filter being connected to the output of the transmission line, the frequency of the R.F. modulated signals being between approximately 150 MHz and 1000 MHz.
-
-
26. A wireless communication system comprising:
-
(a) means at a central location for receiving a plurality of signals for communication with selected wireless communication terminals, (b) means at said central location for converting said signals to spread spectrum radio frequency signals using correlation codes corresponding to particular idle channels, (c) a leaky transmission line located in a communication region within the building, (d) means for applying said spread spectrum radio frequency signals to said transmission line for electromagnetic radiation within said region, (e) at least one mobile wireless communication terminal adapted to receive a predetermined one of the spread spectrum radio frequency signals within the building and for demodulating it into an intelligible signal, and (f) a plurality of similar circuits each comprising an interface means at the central location for connection to an individual junctor of a PABX, for receiving and transmitting communication signals from said junctor and for receiving and transmitting supervisory signals from the PABX relating to a telephone call, a central PCM encoder connected to the interface means for receiving signals to be transmitted to a wireless communication terminal, a modulator using a fixed pseudo-random correlation code associated with the junctor for spread spectrum modulating the encoded signal and generating an RF modulated signal, means for applying the latter RF modulated signal through a transmit band limiting filter to the leaky transmission line, means for receiving an RF modulated signal from the leaky transmission line through a receive band limiting filter, a central demodulator for demodulating and despreading a received RF modulated signal using a fixed pseudo-random correlation code associated with said junctor for demodulating the latter signal, a PCM decoder for receiving a spread spectrum demodulated signal and applying it to the interface means for application to said junctor, a data interface circuit connected to the former interface circuit for receiving and transmitting data signals from and to the associated junctor and/or data bus of the PABX, a data channel spectrum modulator having a fixed correlation code corresponding to the junctor connected to the data interface circuit for spread spectrum and RF modulating a data signal received therefrom and applying the RF modulated signal via the transmit filter to the leaky transmission line, a data channel demodulator having its input connected via the receive filter to the leaky transmission line and for applying a data signal to the data interface circuit for transmission to the junctor or PABX data bus, a central synchronization and control circuit connected to all said interface means for receiving supervisory signals from the junctors and/or a bus of the PABX and for formulating polling and supervisory signals of predefined format corresponding thereto and for translating poll messages and supervisory signals of predefined format to supervisory signals and for applying the latter signals to the junctors and/or bus of the PABX, a supervisory channel modulator using a predetermined supervisory channel correlation code for receiving and spread spectrum modulating said formulated polling and supervisory signals, RF modulating the latter signal and applying the RF modulated signal via the transmit band limiting filter to the leaky transmission line, a supervisory channel demodulator connected to the output of the receive band limiting filter for RF demodulating and despreading a received signal, and applying received poll and supervisory signals to the synchronization and control circuit, a plurality of unidirectional repeaters connected serially at spaced locations in the leaky transmission line whereby an input and an output to the line are defined, the output of the transmit band limiting filter being connected to the input of the transmission line and the input to the receive filter being connected to the output of the transmission line, the transmission line being coaxial cable having a shield containing gaps sufficient to allow RF energy to radiate therefrom.
-
Specification