Simultaneous two-way transmission of information signals in the same frequency band

Abstract

This invention provides designs for communication systems that use adaptive filters in circuits whose purpose is to 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, or wireless channels. The methodology allows two-way DSL transmission over telephone lines, making use of existing DSL hardware and signal standards, so that the upload speed is increased by an approximate factor of ten. Applied to wireless systems with single antennas at the two ends of the channel, a doubling of the data rate is achieved for a given bandwidth. Applied to wireless systems with 2-way adaptive antenna arrays at a central location and a 2-way adaptive antenna array at each of a plurality of subscriber locations, the data rate for a given bandwidth is increased by a large factor.

1 . A two-way communication system, based on adaptive filtering, for simultaneous transmission and reception of information signals through a channel of coaxial cable or twisted pair cable comprising: 
 (a) a first source of data signals, a first data receiver, and a first two-way terminus device connected by means of its two-way terminal to the first end of said channel, connected by means of its input terminal to said first source of data signals, and connected by means of its output terminal to said first data receiver; and    (b) a second source of data signals, a second data receiver, and a second two-way terminus device connected by means of its two-way terminal to the second end of said channel, connected by means of its input terminal to said second source of data signals, and connected by means of its output terminal to said second data receiver, so that signals can be sent from the first source of data signals to the second receiver and from the second source of data signals to the first receiver without interference.    
   
   
       2 . A two-way repeater amplifier device, based on adaptive filtering, comprising: 
 (a) a first cable or channel and a second cable or channel;    (b) a first two-way terminus device and a second two-way terminus device;    (c) a connection connecting the one end of the first cable or channel to the two-way terminal of said first two-way terminus device, and a connection connecting one end of the second cable or channel to the two-way terminal of said second two-way terminus device; and    (d) a crisscross connection between said first and second two-way terminus devices, said crisscross connection connecting the output terminal of said first two-way terminus device to the input terminal of said second two-way terminus device, and connecting the output terminal of said second two-way terminus device to the input terminal of said first two-way terminus device.    
   
   
       3 . The two-way repeater amplifier device of  claim 2 , wherein said two-way terminus devices connected with a crisscross connection have digitally-implemented adaptive filters and have at least one sample time or one unit of delay along the closed-loop path which includes said crisscross connection, said digitally-implemented adaptive filters, and two difference amplifiers or signal subtractors.  
   
   
       4 . A two-way communication system, based on adaptive filtering, for simultaneous transmission and reception of information signals through a channel of coaxial cable or twisted pair cable requiring repeater amplification comprising: 
 (a) a first two-way terminus device having an input terminal connected to input signal source A, an output terminal for outputting an amplified signal B, and a two-way terminal connected to the first end of a first coaxial cable or twisted pair channel;    (b) a two-way repeater amplifier device whose first two-way terminal is connected to the second end of said first channel and whose second two-way terminal is connected to the first end of a second coaxial cable or twisted pair channel; and    (c) a second two-way terminus device whose two-way terminal is connected to the second end of said second coaxial cable or twisted pair channel, whose input terminal is connected to input signal source B, and whose output terminal outputs an amplified signal A.    
   
   
       5 . The two-way communication system of  claim 4 , wherein said coaxial cable or twisted pair channel incorporates two or more two-way repeater amplifier devices for two way signal transmission over long distances.  
   
   
       6 . A two-way signal or information transmission system, based on adaptive filtering and capable of transmission and reception of DSL (Digital Subscriber Line) signals and simultaneously capable of providing conventional telephone service over a conventional twisted-pair telephone line, configured to utilize DSL signal standards and DSL hardware such as DSLAM (DSL access multiplexer) and DSL modems, comprising: 
 (a) a telephone central office;    (b) a high-speed download-data stream, a low-speed download-data stream, a high speed upload-data stream, and a low-speed upload-data stream, and a two-way internet connection located at said telephone central office, capable of downloading from the internet said high-speed download-data stream and said low-speed download-data stream, and capable of uploading to the internet said high-speed upload-data stream and said low-speed upload-data stream;    (c) a first DSLAM located at said telephone central office whose input is connected to said Internet connection to receive said high-speed download-data stream, and whose output is connected to provide said low-speed upload-data stream to the Internet connection;    (d) a first DSL modem located at said telephone central office whose input is connected to said internet connection to receive said low-speed download-data stream, and whose output is connected to provide said high-speed upload-data stream to said internet connection;    (e) a first, second, and a third two-way terminus device, a first signal summer device, a first POTS (“plain old telephone service”) splitter capable of passing through high-frequency DSL signals while separating out low-frequency telephone signals, and a telephone exchange switch, all located at said telephone central office;    (f) a connection between the two-way terminal of said first DSLAM and the two-way terminal of said first two-way terminus device, and a connection between the two-way terminal of said first DSL modem and the two-way terminal of said second two-way terminus device;    (g) a connection between the output terminal of said first terminus device and a first input of said first summer device, a connection between the output terminal of said second terminus device and a second input of said first summer device, a connection between the output of said summer device and the input terminal of said third two-way terminus device, and a connection between the output terminal of said third way two-way terminus device and the input terminals of both said first and second two-way terminus devices;    (h) a connection between the two-way terminal of said third two-way terminus device and a first wideband terminal of said first POTS splitter, and a connection between the narrowband terminal of said first POTS splitter and the telephone exchange switch;    (i) a subscriber location, and said twisted pair telephone line strung between the telephone central office and said subscriber location;    (j) a connection between said telephone line and the second wideband terminal of said first POTS splitter;    (k) a computer capable of downloading and uploading high-speed data streams, a second DSLAM, a second DSL modem, a fourth, fifth and a sixth two-way terminus device, a second signal summer, a second POTS splitter, and a standard telephone instrument, all located at the said subscriber location;    (l) a first high-speed data stream, a first low-speed data stream, a second high-speed data stream, a second low-speed data stream, a first computer terminal connected to said computer for outputting said first high-speed data stream, a connection between said first computer terminal and the input terminal of said second DSLAM, a second computer terminal connected to said computer for outputting said first low-speed data stream, a connection between said second computer terminal and the input terminal of said second DSL modem, a third computer terminal connected to said computer for inputting said second high-speed data stream, a connection between said third computer terminal and the output terminal of said second DSL modem, a fourth computer terminal connected to said computer for inputting said second low-speed data stream, and a connection between said fourth computer terminal and the output terminal of said second DSLAM;    (m) a connection between the two-way terminal of said second DSLAM and the two-way terminal of said fourth two-way terminus device, a connection between the two-way terminal of said second DSL modem and the two-way terminal of said fifth two-way terminus device, a connection between the output terminal of said fourth two-way terminus device, a connection between the output terminal of said fourth two-way terminus device and the first input of said second signal summer, a connection between the output terminal of said fifth two-way terminus device and the second input of said second signal summer, a connection between the output of said second summer and the input terminal of said sixth two-way terminus device, and a connection between the output terminal of said sixth two-way terminus device and the input terminals of both the said fourth and fifth two-way terminus devices; and    (n) a connection between the two-way terminal of said sixth two-way terminus device and a first wideband terminal of said second POTS splitter, a connection between the second wideband terminal of said second POTS splitter and said telephone line, and a connection between the narrowband terminal of said second POTS splitter and said telephone instrument.    
   
   
       7 . A method for two-way transmission and reception of DSL signals over conventional telephone lines using existing asymmetrical DSL signal standards and existing DSL hardware so that upload and download data rates will be equal to conventional download plus upload rates, comprising the steps of: 
 (a) receiving and transmitting DSL and telephone signals with a telephone line at the central office, said telephone line connecting said office to a subscriber location;    (b) separating said telephone signals from the DSL signals, by means of a POTS splitter, for connection to a telephone exchange switch;    (c) separating said receiving and transmitting DSL signals into receiving and transmitting data streams by means of a first two-way terminus device;    (d) processing said receiving and transmitting data streams with bandpass filters or with two-way terminus devices, applying the received signal to both a DSLAM and a DSL modem, obtaining and combining high-frequency and low-frequency transmitted signal components from the said DSLAM and DSL modem for transmission to the said telephone line through the first two-way terminus device, inputting said high-frequency and low-frequency transmitted signal components from an internet connection to the DSLAM and the DSL modem respectively, connecting high and low frequency components of said received signal from the DSL modem and the DSLAM respectively to the internet connection;    (e) separating the DSL signals from the telephone signals at the subscriber location by means of a POTS splitter;    (f) utilizing the telephone signal by a conventional telephone instrument; and    (g) performing the same operations on the DSL signal at the subscriber location as was done at the telephone central office while substituting a computer with data transfer interfaces in place of the said Internet connection.    
   
   
       8 . A method for providing wireless two-way signal or information transmission between a central antenna array and a plurality of subscriber antenna arrays, all of said information transmission taking place simultaneously in a single frequency band, said method comprising the steps of: 
 (a) connecting a plurality of two-way subscriber's adaptive beamformers to said central antenna array, the number of individuals beamformers being equal to the number of subscribers, connecting sources of input baseband signals to all of the signals input terminals of said two-way adaptive beamformers, deriving the respective baseband output signals from the output terminals of said two-way adaptive beamformers, providing mutually uncorrelated random pilot signals to be used by the two-way adaptive beamformers during training;    (b) connecting a two-way adaptive beamformer to each of the distant subscriber antenna arrays, connecting a source of input baseband signals to the input terminal of each subscriber's two-way adaptive beamformer, deriving baseband output signals from the output terminal of each subscriber's two-way adaptive beamformer, providing random pilot signals to be used during training times for training the said subscriber's two-way adaptive beamformers, said pilot signals being mutually uncorrelated and uncorrelated with the pilot signals used by all the beamformers connected to the central antenna array; and    (c) providing adaptive canceling filter means for subtracting all transmitted signals from the radio receiver inputs of the two-way adaptive beamformers connected to the central antenna array.    
   
   
       9 . The method for providing wireless two-way signal or information transmission of  claim 8 , wherein the step of connecting a plurality of two-way adaptive beamformers to said central antenna array comprises connecting said beamformers to an array of one or more antenna elements, and wherein the step of connecting a two-way adaptive beamformer to each of the distant subscriber antenna arrays comprises connecting said beamformers to an array of one or more antenna elements.