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WO2025212952A1 - Système et procédé de communication sur des canaux basés sur le temps - Google Patents

Système et procédé de communication sur des canaux basés sur le temps

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Publication number
WO2025212952A1
WO2025212952A1 PCT/US2025/023043 US2025023043W WO2025212952A1 WO 2025212952 A1 WO2025212952 A1 WO 2025212952A1 US 2025023043 W US2025023043 W US 2025023043W WO 2025212952 A1 WO2025212952 A1 WO 2025212952A1
Authority
WO
WIPO (PCT)
Prior art keywords
modulated waveform
phase
carrier signal
signal
digital data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2025/023043
Other languages
English (en)
Inventor
Alvie McKinley Smith
Tristan Kyler JONES
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TERAWAVE Inc
Original Assignee
TERAWAVE Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US19/098,305 external-priority patent/US20250317336A1/en
Application filed by TERAWAVE Inc filed Critical TERAWAVE Inc
Publication of WO2025212952A1 publication Critical patent/WO2025212952A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying

Definitions

  • the present disclosure pertains generally to data communication systems and, in particular, to methods and systems for signal modulation.
  • a radio station sends a radio signal out over the airwaves to be received by a radio set.
  • a radio station has programming which may include music, news, or programs.
  • Satellites are an example of another transmission channel in which a satellite dish positioned a first location is used to transmit a signal to a satellite to be beamed or sent from the satellite to a second satellite dish positioned at a location remote from the first location. More recently cellular communication systems have been used to communicate between cell phones. An enormous amount of data is being sent using cellular communication systems.
  • AM Amplitude Modulation
  • FM Frequency Modulation
  • Phase Modulation QAM (Quadrature Amplitude Modulation)
  • QPSK Quadrature Phase Shift Keying
  • PSK Phase Shift Keying
  • APSK Amplitude and Phase Shift Keying
  • Amplitude Modulation is a modulation technique used for transmitting information by use of a radio carrier wave.
  • a sinusoidal carrier wave has its amplitude modulated (multiplied) by an audio waveform before transmission.
  • the audio waveform modifies the amplitude of the sinusoidal carrier wave.
  • Frequency Modulation is a modulation technique that encodes information in a carrier wave by varying the frequency of the wave. Although Frequency Modulation has some advantages over Amplitude Modulation some disadvantages include that it requires a more complicated demodulator and that is has a poorer spectral efficiency than some other modulation techniques.
  • QAM is a form of multilevel amplitude and phase modulation that modulates a source signal into an output waveform with varying amplitude and phase.
  • a system that employs QAM modulates a source signal into an output waveform with varying amplitude and phase.
  • a message to be transmitted is mapped to a two-dimensional four quadrant signal space or constellation having signal points or phasors each representing a possible transmission level. Each signal point in the constellation is referred to as a symbol.
  • the QAM constellation has a coordinate system defined by an I or in-phase axis and a Q or quadrature axis or an IQ plane. A symbol may be represented by both I and Q components.
  • QPSK has a synchronous data stream modulated onto a carrier frequency before being over a channel.
  • the carrier can have four states such as 45°, 135°, 225°, or 315°.
  • QPSK also employs a quadrature modulation where the signal points can be described using two orthogonal coordinate axes, such as the IQ plane.
  • IQ plane two orthogonal coordinate axes
  • this form of modulation uses amplitude and phase shift keying.
  • a signal is conveyed by modulating both the amplitude and the phase of a carrier wave.
  • Amplitude and frequency shift keying is able to reduce the number of power levels required to transmit information for any given modulation order.
  • different layering signals of a single frequency or in some cases different layering signals of a small number of frequencies, are summed or otherwise added to a carrier signal at different times in order to convey information.
  • the layering signals will typically be of amplitudes relatively smaller than an amplitude of the carrier signal.
  • the layering signals and the carrier signal may be of identical frequency. Alternatively, the layering signals may be of a frequency different than the carrier frequency. In some embodiments the frequency of the layering signals is a multiple of the carrier frequency.
  • a method for layering frequency modulation in accordance with the disclosure includes generating a modulated waveform using a carrier signal and a plurality of layering signals.
  • the plurality of layering signals may be of the same frequency as the carrier signal or may be of a frequency different from the carrier frequency, such as a multiple of the carrier frequency.
  • the method includes generating the modulated waveform by modifying an instantaneous amplitude of the modulated waveform relative to an instantaneous amplitude of a carrier signal during selected periods of the modulated waveform in accordance with the input digital data.
  • the instantaneous amplitude of the modulated waveform during each of the selected periods may be defined by a summation of one or more of the layering signals and the carrier signal.
  • the modulated waveform and the carrier signal may be of a first frequency.
  • the carrier signal may be of a first phase.
  • a first layering signal of the plurality of layering signals may be of the first frequency and a second phase different from the first phase.
  • a phase of the modulated waveform may lag a phase of the carrier signal and thereby represent a first binary value within the input digital data.
  • a phase of the modulated waveform may lead a phase of the carrier signal and thereby represents a second binary value within the input digital data.
  • At least some of the layering signals may be designed such that their power is substantially zero upon initiation of summing with the carrier signal.
  • the amplitudes of the layering signals may be less than an amplitude of the carrier signal.
  • Embodiments of the present disclosure may also include a method of recovering input digital data from a received analog signal formed from a modulated waveform where an instantaneous amplitude of the modulated waveform may be defined by a summing of a carrier signal and one of more layering signals.
  • the method includes generating first digital samples of the received analog signal, the first digital samples representing a first portion of a period the modulated waveform.
  • the method may also include generating second digital samples of the encoded analog waveform, the second digital samples representing a second portion of the period of the modulated waveform.
  • a bit of the input digital data encoded by the period of the modulated waveform may then be estimated based upon the first digital samples and the second digital samples.
  • the modulated waveform and the carrier signal wave may be of a first frequency.
  • phase differences between the modulated waveform and the carrier signal occurring during periods of the modulated waveform represent bits of the input digital data.
  • the estimating the bit of the input digital data includes computing a first sum of squares of the first digital samples over a first integration interval encompassed by the first portion of the modulated waveform.
  • Embodiments may also include computing a second sum of squares of the second digital samples over a second integration interval encompassed by the second portion of the modulated waveform.
  • Embodiments may also include comparing the first sum of squares and the second sum of squares.
  • a phase of the second modulated waveform may be shifted in a negative direction relative to the phase of the carrier signal, wherein an instantaneous amplitude of the second modulated waveform over the at least one period of the second modulated waveform is based upon a summing of the carrier signal and at least a second layering signal.
  • the functions performed by the processor further include generating, in response to the input digital data, a modulated waveform using the first digital data and the second digital data wherein the first digital data represents occurrences of a first binary value within the input digital data and the second digital data represents occurrences of a second binary value within the input digital data.
  • the phase of the first modulated waveform period may be also shifted in the negative direction during the at least one period of the first modulated waveform relative to the phase of the carrier signal.
  • the instantaneous amplitude of the first modulated waveform may be based upon a summing of the carrier signal and at least the first layering signal and a third layering signal.
  • the shifting of the phase of the first modulated waveform in the positive direction represents a first binary value within the input digital data.
  • the shifting of the phase of the second modulated waveform in the negative direction represents a second binary value within the input digital data where the second binary value is different from the first binary value.
  • the carrier signal, the first layering signal and the second layering signal may be sinusoidal.
  • the first layering signal and the modulated signal may be of a first frequency.
  • the second layering signal may be of a second frequency, the second frequency being an integral multiple of the first frequency.
  • the first layering signal may be of a first phase such that a power of the first layering signal may be substantially zero upon initiation of the summing of the carrier signal and the first layering signal.
  • the second layering signal may be of a second phase such that a power of the second layering signal may be substantially zero upon initiation of the summing of the carrier signal and the second layering sine signal.
  • Embodiments of the present disclosure may also include a system, including an input buffer configured to store input digital data.
  • the system may include a time domain modulator for generating a modulated waveform based upon the input digital data.
  • phase shifts in the modulated waveform relative to a carrier signal encode the input digital data within the modulated waveform.
  • the phase shifts may correspond to summations of one or more layering signals with the carrier signal.
  • the system may also include one or more digital-to-analog converters for generating an encoded analog waveform from a representation of the encoded waveform.
  • the modulated waveform and the carrier signal may be of a first frequency.
  • Each of the phase shifts may represent at least one bit of the input digital data and occur within different periods of the modulated waveform.
  • two or more of the phase shifts may represent two or more bits of the input digital data and may occur within a single period of the modulated waveform.
  • the carrier signal and the one or more layering signals may be sinusoidal.
  • the phase shifts correspond to summations of one or more layering signals and the carrier signal at defined points in time.
  • the communication device may also include one or more digital-to-analog converters for generating an encoded analog waveform from a representation of the encoded waveform, the encoded analog waveform being provided to the RF module.
  • the carrier signal and the one or more layering signals may be sinusoidal.
  • FIG. 1 illustrates a time domain communication device configured to transmit and receive modulated waveforms in accordance with an embodiment.
  • FIG. 2 is a high-level representation of a process for communicating information via a time channel using frequency-layering modulation in accordance with an embodiment.
  • FIG. 3 illustrates a single period of a modulated waveform in accordance with an embodiment.
  • FIG. 4 illustrates a modulated waveform which has been generated pursuant to a multi-layered frequency modulation process of the disclosure.
  • FIG. 6 illustrates a signal layering modulation process in which a modulated waveform is created by using layering signals to encode each input data bit over multiple periods of a carrier signal.
  • FIG. 7 illustrates another example of a form of layered signal modulation in accordance with the disclosure.
  • FIG. 8 is a flowchart that describes a signal layering modulation method according to an embodiment.
  • FIG. 9 is a flowchart that describes a method of recovering input digital from a received analog signal formed from a modulated waveform where an instantaneous amplitude of the modulated waveform is defined by a summing of a carrier signal and one of more layering signals.
  • the method may include adding or otherwise summing various constituent signals at different points in time within a time channel in order to yield a modulated signal having shape or phase characteristics representative of input data to be communicated.
  • modulated waveforms having shape or phase characteristics corresponding to the summation of such constituent signals may be generated, stored, and then recalled and transmitted based upon the input data to be conveyed.
  • modulated waveforms may be created for propagation through a time channel using a variety of different types of signals, in some embodiments an approach termed layering signal modulation has been found to yield modulated waveforms with particularly favorable spectral characteristics. Consistent with this approach, a modulated waveform is produced which exhibits phase shifts relative to a carrier signal that are representative of input digital data. These phase shifts are reflective of the sequential summing over time of the carrier signal with layering signals of relatively small amplitude relative to the amplitude of the carrier signal. In some embodiments each of the phase shifts results from the summing of a layering signal and a carrier signal (e.g., a sinusoid) beginning at a chosen time within a selected period of the carrier signal. As a result, the modulated waveform resulting from each such summing undergoes a subtle change in instantaneous amplitude or shape relative to the shape of the carrier signal, which may hereinafter also be referred to as a “phase shift”.
  • a carrier signal
  • the introduction of a phase shift in the modulated waveform resulting from the summing of a carrier signal and a layering signal may, depending upon the phase of the layering signal, occur within the same period of the carrier signal or at a later time.
  • the phase and timing of application of each layering signal is selected such that the phase shift in the modulated waveform resulting from the summing is not materially manifested until some desired time following initiation of the summing (e.g., after a time corresponding to a quarter period of the carrier signal).
  • the phase shift introduced into the modulated sinusoid by each layering signal may represent one or more bits of the input digital data.
  • each layering signal will typically be selected to be substantially less than the amplitude or power of the carrier signal.
  • the amplitude or power of the layering signal will be set at less than 10% of the amplitude or power of the carrier signal.
  • the amplitude or power of the layering signal will be chosen to be less than 5% of the amplitude or power of the carrier signal.
  • the carrier signal, each layering signal and the modulated sinusoid are all of substantially identical frequency.
  • one or more of the layering signals may be of a frequency different than the carrier frequency.
  • one or more of the layering signals may be of frequencies that are integral multiples of the frequency of the carrier signal.
  • layering signals are summed with the carrier signal such that a phase difference between the modulated sinusoid and the carrier signal occurring during each period of the modulated sinusoid represents at least one bit of the input digital data.
  • the layering signal are summed with the carrier signal such that multiple phase shifts may be introduced into the modulated sinusoid during each period of the modulated sinusoid, thereby enabling each period of the modulated sinusoid to represent multiple bits of the input digital data.
  • FIG. 1 illustrates a time domain communication device 100 configured to transmit and receive modulated waveforms in accordance with the disclosure.
  • the communication device may be implemented as a software defined radio as described hereinafter.
  • the communication device 100 may include computing elements 104, RF components 108, a transmit amplifier 114, a low noise amplifier (LNA) 118, and one or more antennas 122.
  • the computing elements 104 are operatively connected to a memory 130 configured to store instructions which, when executed by the computing elements 104, enable the computing elements 104 to implement a time domain modulator 134 and a time domain decoder 138.
  • the communication device 100 may be configured for fully duplexed operation as a communication signal transmitter and a receiver. When functioning as a communication signal transmitter, the communication device 100 operates to generate and transmit a modulated RF waveform 150 characterized by apparent shifts in phase relative to a carrier phase, such shifts being representative of input digital data 102.
  • the computing elements 104 may receive input digital data 102 over an interface such as via a USB, serial, Ethernet, HDMI or via another standard or proprietary data interface.
  • the input digital data 102 may represent video, audio, textual or other information or combinations thereof.
  • the time domain modulator 134 may cause the computing elements 104 to generate digital representations of modulated waveforms 160 based upon the input data by calculating appropriate phase shifts to be incorporated within the modulated waveforms 160 as described hereinafter. Alternatively, the phase shifts appropriate for representation of various bits or bit patterns within the input digital data may be pre-computed in advance. In such embodiments the time domain modulator 134 would simply generate layering sinusoids of appropriate phases and sum them with a carrier signal at predetermined times within the periods of the carrier signal. In still other embodiments the time domain modulator 134 may cause the computing elements 104 to essentially concatenate periods or segments of modulated waveforms 162 stored within the memory 130.
  • the sequence of modulated waveform segments 162 resulting from this concatenation forms the modulated waveform 160 is representative of the input data 102.
  • One advantage of this embodiment is that the time domain modulator 134 would not be required to generate layering sinusoids in substantially real time for summation with a carrier signal. Rather, the time domain modulator 134 could instead simply recall the required waveform segments from memory 130 as needed to generate the modulated waveform 160.
  • the RF components 108 receive the digital information representing the modulated waveform 160 and convert it to an analog representation using a digital to analog converter (D/A) 112.
  • the RF components 108 may also further process the analog waveform produced by the D/A converter 112 in order generate a modulated radio frequency (RF) waveform 162.
  • the RF components 108 send the modulated RF waveform 162 to the amplifier 114 for amplification.
  • the antenna(s) 122 may transmit the modulated RF waveform 150 output by the amplifier 114.
  • the communication device 100 operates to receive and decode a received modulated RF waveform 152 representative of recovered data 154.
  • the modulated RF waveform 152 is provided to the LNA 118 for amplification.
  • the resulting amplified received signal 155 is provided to the RF components 108, which may perform duplexing operations, analog to digital conversions 156, and potentially other conventional RF signal processing operations.
  • a received modulated signal 168 corresponding to a digital representation of the received modulated RF waveform 152 is then provided by the RF components 108 to the computing elements 104.
  • the computing elements 104 are configured to implement the time domain decoder 138. In a fully duplexed mode of operation the computing elements 104 will be configured to simultaneously implement the time domain modulator 134 and the time domain decoder 138.
  • the time domain decoder 138 is configured to detect differences between a phase of the digital representation of the received modulated RF waveform 152 (as represented by the received modulated signal 168) and a reference carrier phase.
  • the reference carrier phase utilized by the time domain decoder 138 during the decoding process may be established in a variety of ways.
  • the received modulated RF waveform 152 is initially transmitted for a brief period as a pure, i.e., unmodulated, sinusoid in order to enable the time domain decoder 138 to establish the reference carrier phase. This process may be periodically repeated to ensure that the time domain decoder 138 remains locked to the reference carrier phase.
  • the transmitter which transmits the modulated RF waveform 152 may simultaneously transmit an unmodulated sine wave, or “pilot” signal, of a known frequency different from the frequency of the carrier associated with the modulated RF waveform 152.
  • the time domain decoder 138 or other receiver element acquires the phase of the pilot signal it may be used to determine an appropriate carrier phase for use in decoding the received modulated RF waveform 152.
  • the approaches to obtaining timing information from the received modulated RF waveform 152 described above are merely exemplary.
  • the modulated RF waveform 152 may be generated so as to include artifacts or characteristics facilitating such timing acquisition.
  • a third-party reference signal may be utilized to establish the reference carrier phase.
  • a third party e.g., an FM signal transmitted by a transmitter for an FM radio station.
  • both the transmitter transmitting the modulated RF waveform 152 and the communication device 100 could lock their timing to the third-party FM signal, thereby enabling the time domain decoder 138 of the communication device 100 to establish the reference carrier phase.
  • the timing of the time domain modulator 134 within the device 100 and a receiver device disposed to receive the modulated RF waveform 150 could also be established by the third-party FM signal. This would enable such a receiver device to also establish an appropriate reference carrier phase for decoding a digital representation of the modulated RF waveform 150 transmitted by the device 100.
  • the time domain decoder 138 may determine the relative phase shifts of the digital representation of the received modulated RF waveform 152 by comparing it to the reference carrier phase. As an example, this comparison may involve comparing values of the digital representation of the received modulated RF waveform 152 to values of the reference carrier at specific phases. This enables the time domain decoder 138 to detect forward and reverse shifts in the phase of the digital representation of the received modulated RF waveform 152 relative to the reference carrier phase. In one embodiment these forward and reverse phase shifts may be directly mapped to corresponding logical “1” and “0” values encoded by the received modulated RF waveform 152, thereby producing estimates of the recovered data 154.
  • a comparison is made by the time domain decoder 138 of the squares of the amplitude of the digital representation of the received modulated RF waveform 152 across the two integration intervals. This may, for example, involve computing the sum of the squares of the values of the digital representation of the received modulated RF waveform across the integration intervals. By comparing the values of the integrals computed over the different integration intervals the time domain decoder 138 may determine the phase of the received modulated RF waveform 152 relative to the reference carrier phase. Again, these relative phases may be directly mapped to estimates of the recovered data 154.
  • the communication device 100 may allocate the input digital data among a plurality, and in some cases hundreds, thousands or millions, of time channels conveying modulated waveforms narrowly spaced in frequency. By simultaneously transmitting data over a plurality of time channels configured to use carrier/layering signals of a corresponding plurality of frequencies (which may or may not be contiguous) in the manner described herein, increased overall data rates may be supported.
  • each layering signal which may be in the form of a single sinusoidal frequency or tone, is of the same frequency as a base or carrier signal may be referred to herein as Single-Layered Frequency (SLF) modulation.
  • SLF Single-Layered Frequency
  • MLF Multi-Layered Frequency
  • a process for frequency layering includes generating a first signal 210, e.g., a carrier signal, at a time tl.
  • a second signal 220 is then summed with the first signal at a time t2.
  • a third signal 230 is summed together, at a time t3, with the sum of the first signal 210 and the second signal 220.
  • a fourth signal 240 may be summed with the sum of the first signal 210, the second signal 220 and the third signal 230 at a time t4.
  • This process of summing additional signals 250 with the existing sum of signals may continue indefinitely.
  • the first signal 210 may be a sine wave of a defined frequency and amplitude.
  • each of the remaining signals 220, 230, 240, 250 will be of the defined frequency and typically of lesser amplitude (e.g., 40% or less of the amplitude of the first signal 210).
  • at least some of the remaining signals 220, 230, 240, 250 will not be of the defined frequency but all will typically be of lesser amplitude than the first signal 210.
  • the time channel described herein provides an alternative to the communication channels pertinent to conventional modulation techniques.
  • the “channel” is merely the medium used to transmit the signal from a transmitter to a receiver. It may be a pair of wires, a coaxial cable, a band of radio frequencies, or a beam of light. See, e.g., C. E. Shannon, "A mathematical theory of communication,” in The Bell System Technical Journal, vol. 27, no. 3, pp. 379-423, July 1948.
  • a coaxial cable or a band of frequencies are examples of communication channels, they do not comprise an exhaustive list of all such channels.
  • the combination of signals within a time channel provides an alternative modality for conveying information from a transmitter to a receiver.
  • the combination of signals includes a carrier signal and layering signals of the same or a small number of frequencies. While the bandwidth of conventional communication channels in which a band of frequencies is employed to convey modulated signals is limited by the extent of such a frequency band, the rates at which information may be conveyed through the time channel described herein is instead believed to be limited by time-based factors.
  • the rate at which information may be conveyed by the disclosed signal layering techniques may be limited by the number of time slots or intervals in which a given period of a carrier signal or other constituent signal may be subdivided and utilized for combining with other signals.
  • embodiments of the disclosed signal layering modulation system are capable of delivering very high data rates over a single or minimal number of frequencies by adding constituent signals at selected points throughout a time channel as described herein.
  • the single period 300 may be segmented into four quadrants. Specifically, consider a first quadrant (QI) to extend between 0 degrees and 90 degrees and represent a first data bit.
  • a second quadrant (Q2) extends from 90 degrees to 180 degrees and represents a second data bit.
  • a third quadrant (Q3) extends from 180 degrees to 270 degrees and represents a third data bit.
  • a fourth quadrant (Q4) extends from 270 degrees to 360 degrees and represents a fourth data bit.
  • the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements.
  • This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified.
  • “at least one of A and B” can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un procédé de communication sur un canal basé sur le temps à l'aide de signaux de stratification. Le procédé consiste en la réception de données numériques d'entrée générant une forme d'onde modulée en modifiant une amplitude instantanée de la forme d'onde modulée par rapport à une amplitude instantanée d'un signal de porteuse pendant des périodes sélectionnées de la forme d'onde modulée en fonction des données numériques d'entrée. L'amplitude instantanée de la forme d'onde modulée pendant chacune des périodes sélectionnées est définie par une somme d'un ou de plusieurs signaux de stratification et du signal de porteuse. Au moins un sous-ensemble des périodes de la forme d'onde modulée représente chacun un ou plusieurs bits des données numériques d'entrée.
PCT/US2025/023043 2024-04-05 2025-04-03 Système et procédé de communication sur des canaux basés sur le temps Pending WO2025212952A1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
US202463575516P 2024-04-05 2024-04-05
US63/575,516 2024-04-05
US202463633183P 2024-04-12 2024-04-12
US63/633,183 2024-04-12
US202519098339A 2025-04-02 2025-04-02
US19/098,326 2025-04-02
US19/098,339 2025-04-02
US19/098,305 2025-04-02
US19/098,305 US20250317336A1 (en) 2024-04-05 2025-04-02 Communication over time-based channels using layering signals
US19/098,326 US20250317338A1 (en) 2024-04-05 2025-04-02 System for communication over time-based channels

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130027128A1 (en) * 2007-06-28 2013-01-31 Parkervision, Inc. Systems and Methods of RF Power Transmission, Modulation, and Amplification
CN102667742B (zh) * 2009-09-30 2015-08-19 微软技术许可有限责任公司 用于软件定义无线电平台的无线电控制板
US20190140882A1 (en) * 2017-10-27 2019-05-09 Terawave, Llc Narrowband sinewave modulation system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130027128A1 (en) * 2007-06-28 2013-01-31 Parkervision, Inc. Systems and Methods of RF Power Transmission, Modulation, and Amplification
CN102667742B (zh) * 2009-09-30 2015-08-19 微软技术许可有限责任公司 用于软件定义无线电平台的无线电控制板
US20190140882A1 (en) * 2017-10-27 2019-05-09 Terawave, Llc Narrowband sinewave modulation system

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