Stacked-carrier discrete multiple tone communication technology and combinations with code nulling, interference cancellation, retrodirective communication and adaptive antenna arrays

A radio transmitter system providing for spatial and frequency dispersion, comprising:

• an antenna system having "n" positive-integer number of individual antennas spatially distributed in a group and providing for as many as "n" positive-integer number of spatially distributed communication channels;
• a radio frequency amplifier bank having individual amplifiers connected to corresponding antennas of the antenna system wherein each amplifier has an adjustable gain to provide for a controlled steering of beams and nulls of radio frequency signal transmissions to said radially-distributed spatial communication channels;
• a discrete multitone stacked carrier spread spectrum transmit modulator connected to the amplifier bank and providing for a frequency-dispersed plurality of communication channels;
• a spreader having respective outputs connected to the modulator and a data input and providing for a spreading of data concurrently across all of said frequency-dispersed plurality of communication channels;
• and
• steering means connected to said radio frequency amplifier bank and providing for a selection of one of said "n" positive-integer number of radially-distributed spatial communication channels.

A radio receiver system providing for spatial and frequency dispersion, comprising:

• an antenna system having "n" positive-integer number of individual antennas spatially distributed in a group and providing for as many as "n" positive-integer number of radially-distributed spatial communication channels;
• a radio frequency amplifier bank having individual amplifiers connected to corresponding antennas of the antenna system and each amplifier having an adjustable gain which provides for a controlled steering of beams and nulls of radio frequency signal transmissions to said radially-distributed spatial communication channels;
• a discrete multitone stacked carrier spread spectrum demodulator connected to the amplifier bank and providing for a frequency-dispersed plurality of communication channels;
• a despreader having respective inputs connected to the demodulator and a data output and providing for a despreading of data included across all of said frequency-dispersed plurality of communication channels;
• and
• steering means connected to said radio frequency amplifier bank and providing for a selection of one of said "n" positive-integer number of radially-distributed spatial communication channels.

A multiple-access method for stacked-carrier spread spectrum radio communication, comprising the steps of:

• constructing at a transmitter a stacked-carrier spreading gain from the complex amplitude and phase gain of a complex sinusoid for each of a plurality of discrete frequency communication channels;
• spreading at said transmitter an arbitrary narrow-band baseband pre-spread data with a vector multiplier and an inverse frequency communication channelizer;
• simultaneously transmitting from said transmitter said data after spreading over said plurality of discrete frequency communication channels with said stacked-carrier spreading gain;
• and
• despreading said plurality of discrete frequency communication channels at a receiver with a vector inner product linear combiner and frequency communication channelizer, wherein said arbitrary narrow-band baseband pre-spread data is recovered with relative immunity to communication channel interference.

An interference cancellation method for stacked-carrier spread spectrum radio communication, comprising the steps of:

• constructing at a transmitter a stacked-carrier spreading gain from the complex amplitude and phase gain of a complex sinusoid for each of a plurality of discrete frequency communication channels;
• spreading at said transmitter an arbitrary narrow-band baseband pre-spread data with a vector multiplier and an inverse frequency communication channelizer;
• simultaneously transmitting from said transmitter said data after spreading over said plurality of discrete frequency communication channels with said stacked-carrier spreading gain;
• despreading said plurality of discrete frequency communication channels at a receiver with a vector inner product linear combiner and frequency communication channelizer, wherein said arbitrary narrow-band baseband pre-spread data is recovered with relative immunity to communication channel interference;
• and
• code nulling with interference cancellation means according to information obtained from the step of despreading.

An adaptive antenna array method for stacked-carrier spread spectrum radio communication, comprising the steps of:

• constructing at a transmitter a stacked-carrier spreading gain from the complex amplitude and phase gain of a complex sinusoid for each of a plurality of discrete frequency communication channels;
• spreading at said transmitter an arbitrary narrow-band baseband pre-spread data with a vector multiplier and an inverse frequency communication channelizer;
• simultaneously transmitting from said transmitter said data after spreading over said plurality of discrete frequency communication channels with said stacked-carrier spreading gain;
• despreading said plurality of discrete frequency communication channels at a receiver with a vector inner product linear combiner and frequency communication channelizer, wherein said arbitrary narrow-band baseband pre-spread data is recovered with relative immunity to communication channel interference;
• and
• adjusting the gains of several amplifiers connected to an antenna array according to said despread baseband data.

A time-division duplex method for stacked-carrier spread spectrum radio communication, comprising the steps of:

• dividing time into time slots reserved for transmitting a first plurality of discrete frequency communication channels to a distant receiver and for receiving a second plurality of discrete frequency communication channels from a distant transmitter;
• constructing at a proximal transmitter a stacked-carrier spreading gain from the complex amplitude and phase gain of a complex sinusoid for at least one of said first or second plurality of discrete frequency communication channels;
• spreading at said proximal transmitter an arbitrary narrow-band baseband pre-spread data with a vector multiplier and an inverse frequency communication channelizer;
• simultaneously transmitting from said proximal transmitter said data after spreading over said first plurality of discrete frequency communication channels with said stacked-carrier spreading gain;
• despreading said second plurality of discrete frequency communication channels at a proximal receiver with a vector inner product linear combiner and frequency communication channelizer, wherein said arbitrary narrow-band baseband pre-spread data is recovered with relative immunity to communication channel interference;
• and
• controlling the step of dividing time with precision time information obtained from a timing signal source that is available to both said distant and proximal transmitters and both said distant and proximal receivers.

A radio communication system, comprising:

• a multi-tone transmitter array for multi-spectral carrier signal transmission according to a spectral weight calculation by a computer that discriminates between a first plurality of individual remote receivers;
• a first antenna array connected to the transmitter array and that provides for spatial adjustments of the transmitted power of said multi-spectral carrier signal transmission according to a spatial weight calculation by a computer that discriminates between a second plurality individual remote receivers;
• a multi-tone receiver array for multi-spectral carrier signal reception according to a spectral weight calculation by a computer that discriminates between a first plurality of individual remote transmitters;
• and
• a second antenna array connected to the receiver array and that provides for spatial adjustments of the received power of said multi-spectral carrier signal reception according to a spatial weight calculation by a computer that discriminates between a second plurality individual remote transmitters.

A method of recovering a digital communication signal that was spread and modulated onto each of a plurality of stacked carrier signals using a distinct spreading gain for each of said plurality of stacked carrier signals, transmitted across a wireless medium, and received at a receiver as a plurality of received stacked carrier signals, comprising the steps of:

• channelizing each of said received stacked carrier signals to identify a baseband signal for each of said received stacked carrier signals, said received stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of received stacked carrier signals;
• despreading by applying despread weights that are different than said spreading gains to each of said received baseband signals and combining said received baseband signals to obtain a baseband signal that compensates for interference and maximizes a signal to noise and interference ratio;
• and
• removing at least one of time distortion and frequency distortion that exists in said baseband signal to obtain a recovered digital communication signal that corresponds to said digital communicatior signal.

A method of spreading a digital communication signal comprising the steps of:

• spectrally spreading said digital communication signal onto a plurality of stacked carrier signals to obtain a plurality of spectrally spread digital communication signals, each of said plurality of stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of stacked carrier signals;
• spatially spreading each of said plurality of spectrally spread digital communication signals to obtain a plurality of spatially and spectrally spread digital communication signals;
• and
• transmitting, from each antennae element of a multi-element antennae array, associated ones of said plurality of spatially and spectrally spread digital communication signals across a wireless medium to a receiver.

A method of digitally communicating comprising the steps of:

• spreading, in a moving transmitter, digital information that was spread using distinct spreading gains onto each of a plurality of stacked carrier signals, each of said plurality of stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of stacked carrier signals;
• transmitting each of said stacked carrier signals across a wireless medium from said moving transmitter to a receiver;
• receiving, at said receiver, said transmitted plurality of stacked carrier signals as received stacked carrier signals;
• channelizing each of said received stacked carrier signals to identify a baseband signal for each of said received stacked carrier signals;
• despreading by applying despread weights that are different than said spreading gains to each of said received baseband signal and combining said received baseband signals to obtain a baseband signal that compensates for interference and maximizes a signal to noise and interference ratio;
• and
• processing said baseband signal to obtain recovered digital information that corresponds to said transmitted digital information.

A method of digitally communicating comprising the steps of:

• spreading digital information, at a first station having a multi-element antenna array, using distinct spreading gains, onto each of a plurality of stacked carrier signals, each of said plurality of stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of stacked carrier signals and each of said antenna elements being used to transmit different ones of said stacked carrier signals;
• transmitting each of said stacked carrier signals across a wireless medium from said first station to a second station;
• receiving, at said second station using a second multi-element antenna array, said transmitted plurality of stacked carrier signals as received stacked carrier signals, each of said second antenna elements being used to receive different ones of said received stacked carrier signals;
• channelizing each of said received stacked carrier signals to identify a baseband signal for each of said received stacked carrier signals;
• and
• despreading by applying despread weights that are different than said spreading gains to each of said received baseband signal and combining said received baseband signals to obtain a baseband signal that compensates for interference and maximizes a signal to noise and interference ratio.

A method of digitally communicating comprising the steps of:

• spreading, at a first station, digital information onto each of a plurality of stacked carrier signals using a distinct spreading gain for each stacked carrier signal, each of said plurality of stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of stacked carrier signals;
• transmitting each of said stacked carrier signals across a wireless medium from said first station to a second station;
• receiving, at said second station using a multi-element antenna array, said transmitted plurality of stacked carrier signals as received stacked carrier signals;
• channelizing on each element of said array each of said received stacked carrier signals to identify a baseband signal for each of said received stacked carrier signals;
• and
• despreading by applying despread weights that are different than said spreading gains to each of said received baseband signal and combining said received baseband signals to obtain a baseband signal that compensates for interference and maximizes a signal to noise and interference ratio, said despreading step using a linear combiner dimensionality which is composed of spectral dimensions and spatial dimensions.

A method of despreading a digital communication signal received at a receiver from across a wireless medium comprising the steps of:

• receiving, at each antennae element of a multi-element antennae array, a plurality of stacked carrier signals, each of said plurality of stacked carrier signals having a channel bandwidth that is separable from said channel bandwidth of other of said plurality of stacked carrier signals;
• spatially despreading said plurality of stacked carrier signals to obtain spatially despread digital communication signals;
• and
• spectrally despreading each of said plurality of spatially despread digital communication signals to obtain a spatially and spectrally despread digital communication signal.