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Simultaneous two-way transmission of information signals in the same frequency bandRelated Patent Categories: Telecommunications, Wireless Distribution System, Two-waySimultaneous two-way transmission of information signals in the same frequency band description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070173195, Simultaneous two-way transmission of information signals in the same frequency band. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED APPLICATIONS [0001] This application is a divisional of U.S. application Ser. No. 09/852,469, filed on May 9, 2001, which claims priority to Provisional Application No. 60/202,974 filed May 9, 2000. These applications are herein incorporated by reference. FIELD OF THE INVENTION [0002] This invention relates generally to the field of telecommunications, and more particularly to the use of adaptive filters in circuits which enable two-way transmission of information signals in the same frequency band at the same time over twisted pair channels, coaxial cable channels, fiber optic channels, and wireless channels. BACKGROUND OF THE INVENTION [0003] At the present time, transmission of information via the Internet, whether digital data, digital audio, digital video, or other forms of data signals, is vital to the world's business. [0004] These signals are carried by twisted-pair cable, coaxial cable, filter optic cable, or by wireless radio or satellite communication links. These channels may be narrow-band or wide-band. In addition to the Internet, there are many other forms of electronics communication channels, both analog and digital. [0005] For many applications, there is need for two-way simultaneous communication. Currently, this is done by separating the inbound and outbound signals by placing them in different frequency bands. In order to conserve bandwidth and increase channel capacity, this invention provides means for two-way transmission of information signals in the same channel, in the same frequency band, at the same time. [0006] Bi-directional amplification and communication systems. have been proposed in the prior art. Separating inbound and outbound signals by placing them in separate frequency bands is commonly done (see for example U.S. Pat. No. 5,365,368). Separation of inbound and outbound signals by transmitting them at mutually exclusive times for radar and television applications is taught by U.S. Pat. Nos. 5,105,166 and 4,714,959. In microwave radio systems, separation can be achieved by utilizing horizontal and vertical polarizations for inbound and outbound radiation (see U.S. Pat. No. 5,481,223). This approach is workable, except for transmission through multipath where horizontal and vertical polarization components would become mixed. A different approach is taken by U.S. Pat. No. 5,119,365, which shows means for cancellation of transmitted signal components that leak into the received signal path at the head end of a bi-directional wire or cable communication line. Further along this direction, U.S. Pat. No. 5,187,803 shows a means for cancellation of transmitted signal components that leak into the received signal path within a bi-directional amplifier located in the middle of a two-way wire or cable communication line. The problem with the prior-art cancellation methods is that they depend critically on analog circuits whose component values must be adjusted, tuned, and balanced to create cancellation. There is no automatic means for initial tuning or for maintaining balance over time in the presence of line and component impedance changes, generally due to temperature changes and aging. [0007] Limitations of the prior art are overcome by the methods of this invention. Inbound and outbound signals are separated by means of cancellation techniques, which are based on adaptive filtering. Learning and self-adaptive circuits are used in combinations to make initial tuning for cancellation automatic, and to continually and automatically maintain the circuit balance necessary for separation of inbound and outbound signals. OBJECTS AND SUMMARY OF THE INVENTION [0008] It is an object of this invention to provide designs for components of communication systems that allow simultaneous two-way signal and data transmission over the same transmission channel, in the same band of frequencies. These components include two-way terminal devices for the ends of the transmission channel. On each end, they connect to sources of signal to be transmitted into the channel, and they separately connect to receivers of signal arriving from the channel. Also included are two-way repeater amplifiers that may b e inserted into the channel at various distances, if required, to compensate for transmission losses. Included in addition are line tap circuits that allow "T" connections to the transmission channel. Also included are schemes for interconnection of three or more transmission lines with various paths and directions for information flow. For wireless channels, circuits are provided for full duplex operation in the same frequency band. Channel capacity with multiple users can be greatly increased by incorporating adaptive antenna arrays for transmission and reception in the same frequency band. Fiber-optic data transmission systems are described for two-way transmission which include 2-way terminus devices for the ends of the channel and 2-way repeater amplifiers, as may be required, to compensate for signal loss. These systems afford multiple wavelength transmission and they incorporate repeater amplifiers whose data signal paths are all optical or optical and electronic. These and other circuits for two-way communication systems are provided. They all make use of adaptive filters. BRIEF DESCRIPTION OF THE DRAWINGS [0009] The foregoing and other objects of the invention will be more clearly understood from the following detailed description when read in conjunction with the accompanying drawings, wherein: [0010] FIGS. 1A-1B show an adaptive filter of the type used with the invention, and a functional representation of it. [0011] FIGS. 2A-2B show a system that can transmit data signals in two directions at the same time in the same frequency band, and a functional representation of it. [0012] FIGS. 3A-3E show a system for two-way transmission of data signals which includes a 2-way repeater amplifier, experimental data showing learning, convergence, and low steady-state error for simultaneous two-way signal transmission, a functional representation of this system and a functional representation of a system whose 2-way repeater includes circuits that de-modulate, and recreate the digital baseband signals, then re-modulate and amplify them for further transmission. [0013] FIGS. 4A-4C show several methods for making "T"-connections that allow two-way communication between three transmission lines. [0014] FIGS. 5A-5E show methods for making connections between three or more transmission lines that provide communication paths other than simple two-way links between all the transmission lines. [0015] FIGS. 6A-6B show two-way radio systems capable of transmitting and receiving simultaneously with the same antenna in the same frequency band. [0016] FIGS. 7A-7B show a 2-way terminus utilizing an adaptive filter in conjunction with a directional coupler, and a functional representation of this terminus. [0017] FIG. 8 shows a two-way signal and data transmission system with means for supplying DC power over the transmission line for the 2-way terminus devices and for the 2-way repeater amplifier. [0018] FIGS. 9A-9B show DSL (digital subscriber line) systems that allow high-speed internet service in both directions and in the same frequency band over a twisted-pair telephone line while at the same time providing ordinary telephone service over the same telephone line, with the high-frequency DSL signals separated from low-frequency telephone signals in one case by means of capacitors and inductors, or by means of telephone splitter devices. [0019] FIG. 10 shows a two-way fiber-optic transmission system, each end of the transmission line having a 2-way terminus that converts signals from electronic to optical and optical to electronic, and having a 2-way repeater amplifier in the middle of the line that also converts signals from optical to electronic and from electronic to optical. Continue reading about Simultaneous two-way transmission of information signals in the same frequency band... 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