161 results about "Phase-shift keying" patented technology

The invention discloses a wide-narrow integrated ad hoc network method, and belongs to the technical field of network communication. The method comprises the following steps: a network node generates dynamic topology information based on a narrow-band communication module periodic broadcast state beacon; according to the link quality and the node load in the topological information, coordinating the resource allocation of broadband and narrowband channels by adopting a load-aware time slot allocation algorithm; data are classified according to service types, broadband data are modulated and transmitted by adopting orthogonal frequency division multiplexing, and narrowband control instructions are modulated and transmitted by adopting differential phase shift keying; when the link quality is deteriorated, the link is switched, and the transmitting power and the frequency band parameters are dynamically adjusted; and adaptive switching and data distribution of wide and narrow band communication modes are realized. According to the method, the problems of difficulty in topology maintenance and low bandwidth and narrowband resource allocation efficiency in a high-dynamic network scene are solved, the network adaptability, the anti-interference capability and the resource utilization rate are remarkably improved through a dynamic cooperative bandwidth and narrowband communication mode, and meanwhile, the protocol switching overhead and energy consumption are reduced.

The invention discloses an integrated sensing and backscatter communication method and device based on backscatter, and relates to the technical field of wireless communication, and the method comprises the steps: receiving an open-circuit pilot frequency receiving voltage and a short-circuit pilot frequency receiving voltage generated by a receiving antenna based on a pilot frequency signal; determining a tag antenna mode pilot frequency voltage component and a clutter tag structure combined pilot frequency voltage component, and correspondingly determining a tag antenna mode reflection coefficient and a clutter tag structure combined reflection coefficient based on the tag antenna mode pilot frequency voltage component and the clutter tag structure combined pilot frequency voltage component by adopting a compressed sensing algorithm; and transmitting a data signal to a receiving antenna through the tag by adopting binary phase shift keying, collecting a data receiving voltage, and completing signal demodulation by adopting the data receiving voltage, a tag antenna mode reflection coefficient and a combined reflection coefficient to obtain a bit mapping symbol of the data signal. The backscatter communication is realized through combination of backscatter and tag impedance modulation, and the backscatter communication performance is improved.

The invention discloses a coding method and device based on power domain chaotic distribution matching. The method comprises the following steps: acquiring a key initial value and to-be-sent original data; performing chaotic encryption on the key initial value through a Chua's chaotic system to generate a chaotic sequence; carrying out system conversion on the key initial value, and carrying out mapping processing according to a rule to obtain a key stream formed by a QPSK constellation diagram; performing encryption and serial-to-parallel conversion on original data in a binary form by using the chaos sequence, and then performing quadrature phase shift keying (QPSK) mapping to obtain an information stream formed by uniformly distributed QPSK constellation diagrams; respectively carrying out power distribution on the key stream and the information stream, and carrying out constellation diagram superposition on the key stream and the information stream after power distribution to form an encrypted stream of a non-uniformly distributed 16 QAM constellation diagram; and performing translation rotation on each region of the partitioned constellation diagram of the encrypted stream according to a rule, and finally realizing probabilistic shaping to obtain the PS-16QAM constellation diagram encrypted stream. The method can improve the quality of signal transmission.

Methods and apparatuses for controlling a reconfigurable intelligent surface (RIS) to generate one or more modulated symbols may be described herein. The processor may be configured to generate an amplitude of the modulated symbol(s) by activating one or more of the plurality of portions of the RIS. The processor may be configured to generate a phase of modulated symbol(s) by controlling one or more phase shifts applied by one or more activated portions of the RIS. The method may include transmitting the one or more modulated symbols using the RIS. The method may include a RIS-based joint beamforming and / or modulation scheme with low PAPR. The RIS may be divided into one or more portions for attaining various gains. The RIS may be divided into an In-phase and / or Quadrature branches. The method may include an Amplitude-phase shift keying (A-PSK) and / or Quadrature amplitude-phase shift keying (AQ-PSK) joint beamforming and / or modulation scheme(s).

This disclosure is directed to a transmitter including a phase locked loop (PLL), a modulator, and a power amplifier (PA). A controller including programmable and / or hardened logic circuitry may be coupled to the PLL and the modulator. The controller may provide encoded signals based on quadrature phase shift keying (QPSK) scheme for transmission by the transmitter. In particular, the controller may provide multiple bursts of pulses indicative of data packets to the modulator. Moreover, the controller may provide instructions indicative of generating clock signals with in-phase and quadrature phases to the PLL. The PLL may generate clock signals corresponding to the in-phase and quadrature phases. As such, the transmitter may generate in-phase and quadrature output signals based on receiving each burst of pulses with either in-phase or quadrature phases.

The invention discloses a power information cooperative modulation method based on a buck DC converter, and relates to the technical field of power information cooperative modulation. According to the method, power information cooperative modulation is carried out by combining the structural characteristics of the three-phase interleaving buck type direct-current converter, the amplitude and phase characteristics of output voltage ripples are changed by adjusting the carrier phase offset according to the inherent phase relation that three phases of the three-phase interleaving buck type direct-current converter are interleaved by 120 degrees, and modulation of information coding is achieved. Unification of the phase shift keying switching frequency is realized, the performance of power transmission and information interaction is improved, and the ripple amplitude fluctuation range is relatively small. When a plurality of converters operate in parallel, the ripple amplitude of the converter in a non-communication state approaches zero, so that interference on information demodulation of the converter at a communication end can be avoided, an orthogonal switching frequency switching strategy does not need to be adopted, the system complexity is effectively reduced, and the applicability is improved.

Apparatus, systems, and methods for a transmitter array for enhanced communication systems may be provided. According to an aspect a transmitter array may be provided. The transmitter array may include a plurality of equivalent transmitter units. Each equivalent transmitter unit may include an antenna and a QPSK modulator. Each equivalent transmitter unit may be selectively activatable. In some embodiments, upon activation of a set of equivalent transmitter units selected from the plurality of equivalent transmitter units, a desired modulated output signal is generated. According to another aspect, a method of generating a desired modulated output signal may be provided. The method may include receiving a plurality of local oscillator (LO) signals at a transmitter array. The method may further include selectively activating a set of equivalent transmitter units of the plurality of equivalent transmitter units to generate the desired modulated output signal.

The invention discloses an incoherent index modulation method and system based on a fluid antenna, and belongs to the field of wireless communication. A plurality of fluid antenna transmitting modes are preset for a fluid antenna wireless communication system, and a beam forming vector corresponding to each transmitting mode is optimized by using a closed expression of a fluid antenna space coding gain, so that a transmitter can transmit a phase shift keying modulation symbol while transmitting the phase shift keying modulation symbol; spatial bit information can be implicitly transmitted through a cyclic shift value of a fluid antenna emission mode index value, and the whole communication process does not need to depend on channel state information, so that the multiple-input-multiple-output communication method for fluid antenna energization without channel estimation is realized.

The invention relates to the technical field of navigation signal analysis, in particular to a QPSK (Quadrature Phase Shift Keying) non-cooperative navigation signal analysis method and a QPSK non-cooperative navigation signal analysis system for multi-domain feature joint estimation. Traversing phases in the phase sequence in sequence, and obtaining an energy threshold value in combination with the center frequency estimation value of the current section; performing iterative analysis on the frequency and the phase to obtain estimated values of the frequency and the phase; obtaining a complex baseband signal through the estimated values of the frequency and the phase; judging whether IQ code crossing occurs or not according to a cross-correlation relationship between the complex baseband signal and a local code stream sequence, and if the code crossing occurs, performing adjustment to obtain a corrected I-path baseband signal and a corrected Q-path baseband signal; adjusting the length of a chip through a code rate so as to reconstruct a code element sequence and obtain I-path and Q-path pure code element sequences; and taking the I-path and Q-path pure code element sequences as analysis results of the non-cooperative navigation signals. According to the invention, the accuracy of analyzing the non-cooperative navigation signal is improved.

An audio authentication and identity verification system and method that encodes dynamic cryptographic information across the audible and inaudible spectrum (0 Hz→30 kHz, scalable to 124 kHz). A rolling acoustic signature simultaneously embeds identity, time, date, and GPS location using a hybrid of frequency shift keying (FSK), phase shift keying (PSK), Morse style pulse duration modulation, and time domain multiplexing. To guarantee post-event privacy and integrity, the system further incorporates a dual custody audio architecture in which every authenticated recording is split into complementary bit interleaved segments stored separately, and the decryption key is fragmented via Shamir 3-of-5 secret sharing—preventing unilateral access or tampering. The system establishes a tamper proof, real time, and offline capable authentication layer that functions in air, through conventional microphones, and via dedicated emitter hardware.

The invention provides a signal processing method and system in continuous variable quantum key distribution, and relates to the technical field of communication. The method comprises the following steps: carrying out up-conversion operation on two double-sideband quadrature phase shift keying signals, and respectively converting the two double-sideband quadrature phase shift keying signals into a first center frequency and a second center frequency to form a first quantum signal in an X polarization direction and a first quantum signal in a Y polarization direction; adding a first pilot signal in the X polarization direction to the first quantum signal in the X polarization direction to obtain a first optical signal in the X polarization direction; adding a first pilot signal in the Y polarization direction to the first quantum signal in the Y polarization direction to obtain a first optical signal in the Y polarization direction; combining the first optical signal in the X polarization direction and the first optical signal in the Y polarization direction into a polarization multiplexing signal by using a polarization coupler; and transmitting the polarization multiplexing signal to a receiving end through a quantum channel. According to the embodiment of the invention, the security key rate of continuous variable quantum key distribution can be improved.

The present disclosure provides a method (100) in a network device. The method (100) includes: transmitting (110) Downlink Control Information, DCI, to a terminal device, the DCI containing information from which a TBS index is derivable. The BS index is usable to determine a TBS from a set of TBSs including TBSs usable with Quadrature Phase Shift Keying, QPSK, and TBSs usable with 16-Quadrature Amplitude Modulation, 16-QAM. When the DCI is for a Narrowband Physical Downlink Shared Channel, NPDSCH, the TBSs usable with 16-QAM are determinable by the terminal device based on a deployment mode.

The invention discloses an interference communication integrated waveform generation method based on spectrum dispersion-multi-system phase shift keying. The problems of difficult communication information demodulation and high hardware implementation complexity in interference communication integration research are mainly solved. According to the scheme of the invention, the SMSP interference signal is formed by periodically expanding the chirp signal on the time domain, the communication information is modulated on the phase of the chirp signal, and the plurality of chirp signals carrying the communication information can cause dense false target interference at random positions on the radar, so that the interference and communication integrated signal is generated. At a communication receiving end, a first linear frequency modulation signal is adopted to perform carrier synchronization, so that the synchronization effect can be improved by using the high time width-bandwidth product characteristic of the linear frequency modulation signal, and communication information can be demodulated directly by using a coherent demodulation mode; at a radar receiving end, the signal can generate a radar interference effect with dense false target characteristics.

This invention discloses a simple, multifunctional, integrated 5G analog fronthaul in-band full-duplex communication method for remote units (RUs). This method primarily relates to the fields of optical communication technology and microwave technology. The system structure of the method, as shown in Figure 1 of the specification, includes a laser, downlink vector signal, electrical local oscillator signal, downlink interference signal, target signal, reference signal, 90° electrical coupler, dual-polarization quadrature phase-shift keying modulator, phase modulator, single-mode fiber, optical coupler, polarization beamsplitter, polarization beam combiner, polarization controller, polarizer, and photodetector. The remote unit (RU) uses a single phase (PM) modulator to achieve self-interference cancellation (SIC) combined with anti-fiber dispersion transmission and down-conversion, eliminating the need for bias control and additional local oscillator (LO) branches, resulting in a simple structure. At the central office (CO), the carried downlink signal and local oscillator signal are single-sideband modulated to achieve anti-fiber dispersion transmission. The RU uses wavelength reuse technology to perform PM cascaded down-conversion on the signal received from the uplink, and the SIC is moved from the RU to the CO to simplify the RU. The entire link has no optical filter and is reconfigurable.

A signal transmission method based on constellation-aided LoRa modulation includes: a modulated bit sequence and a phase shift keying (PSK) bit sequence are obtained, and the modulated bit sequence is subjected to Gray mapping and spread spectrum modulation to generate a LoRa signal set; the PSK bit sequence is subjected to PSK constellation mapping based on a preset constellation point coordinate set to output a PSK constellation point set; the LoRa signal set is subjected to PSK modulation based on a preset imaginary unit and the PSK constellation point set to generate a transmission signal; a complex number sequence is generated based on the transmission signal and a preset raw down chirp signal; and real-imaginary part judgment is performed on the complex number sequence to output a LoRa modulation information sequence set and a PSK symbol judgment result. A signal transmission system based on CA-LoRa is further provided.

The invention relates to a phase shift keying signal positioning method based on co-prime sum-difference common-array compensation. Direction of arrival estimation wide in estimation range and high in estimation precision is achieved. After a non-circular signal is received through an array antenna of an augmented co-prime array structure, the non-circular signal is subjected to digital processing to obtain a digital signal, and an augmented co-prime array comprises a first sub-array and a second sub-array; carrying out covariance matrix calculation on the digital signal and vectorizing a covariance matrix to obtain a difference comatrix and a sum comatrix; determining redundant array elements according to the structure that the array elements in the augmented co-prime array are removed without influencing the difference coordination array, and repositioning the redundant array elements to obtain a third sub-array and a fourth sub-array; translating all the sub-arrays by an optimal shift distance to obtain a converted augmented co-prime array structure; and estimating the direction of arrival by adopting the MUSIC algorithm again according to the conversion augmented co-prime array to obtain the direction of arrival.

The present invention discloses a power information cooperative modulation method based on a buck DC converter, and relates to the technical field of power information cooperative modulation. The present invention combines the structural characteristics of the three-phase staggered parallel buck DC converter itself to perform power information cooperative modulation, utilizes the inherent phase relationship of the three-phase staggered 120° of the three-phase staggered parallel buck DC converter, and changes the amplitude and phase characteristics of the output voltage ripple by adjusting the carrier phase offset to achieve information coding modulation. The present invention realizes the unification of phase-shift keying switching frequency, improves the performance of power transmission and information interaction, and the ripple amplitude fluctuation range is small. When multiple converters are operated in parallel, the converter in the non-communication state can avoid interference with the information demodulation of the communication end converter because the ripple amplitude approaches zero, and there is no need to adopt an orthogonal switching frequency switching strategy, which effectively reduces the system complexity and improves applicability.

This disclosure provides a signal processing method and system for continuous-variable quantum key distribution, relating to the field of communication technology. The method includes: up-converting two double-sideband quadrature phase-shift keying (PSK) signals to a first center frequency and a second center frequency, respectively, to form a first quantum signal in the X-polarization direction and a first quantum signal in the Y-polarization direction; adding a first pilot signal in the X-polarization direction to the first quantum signal in the X-polarization direction to obtain a first optical signal in the X-polarization direction; adding a first pilot signal in the Y-polarization direction to the first quantum signal in the Y-polarization direction to obtain a first optical signal in the Y-polarization direction; using a polarization coupler to combine the first optical signal in the X-polarization direction and the first optical signal in the Y-polarization direction into a polarization multiplexed signal; and transmitting the polarization multiplexed signal to a receiver through a quantum channel. According to embodiments of this disclosure, the security key rate of continuous-variable quantum key distribution can be improved.

The application discloses a kind of detection communication integrated collision avoidance sonar signal design method and device, its method includes: modulating continuous frequency phase shift keying signal CFPSK, generates initial frequency and Chirp signal;Modulate continuous frequency phase shift keying signal, BPSK signal is modulated to Chirp by phase modulation two-way, then two-way signal is added, obtains final transmitting signal;After CFPSK signal is pulse width modulated, it is emitted by the transducer of collision avoidance sonar;Collecting collision avoidance sonar original echo signal, obtains original echo data;Original data collected is preprocessed, and two-way signal of virtual and real is obtained;Signal is compressed into short pulse bandwidth signal, generates the impulse response parameter of two groups of matched filters, each group is matched with virtual and real two-way signal to obtain four groups of matching results, and the final matching output is obtained from real number field to complex number field;The starting point of CFPSK signal is determined by detecting the peak position of matched filter output, and echo signal is accurately intercepted from received signal for communication decoding, and coherent detection is carried out on received signal and reference carrier.The application realizes the cooperative work of detection and communication function.

A method for processing a radar signal using Doppler Division Multiplexing, DDM, wherein the radar signal is transmitted from a plurality of transmitters each using a different phase shift keying scheme, wherein the weight of at least one of the different phase shift keying schemes is not a power of two, the method comprising a sequence of steps comprising: Transmitting a radar signal from a plurality of transmitters, wherein the transmission from each transmitter uses a different respective phase shift keying scheme, Receiving a radar signal at a plurality of receivers, each combination of transmitter and receiver representing a virtual antenna; Converting the received radar signal into digital received radar data; Performing a range Fourier transform and a Doppler Fourier transform to convert the received radar data into a range-Doppler data cube having a plurality of bins, each containing a complex numerical value as a function of range and Doppler; and DDM decoding the range-Doppler data cube into received scene data as a transformed data cube having a plurality of bins each containing a complex number value as a function of range, Doppler, and virtual antenna; the method further comprising: a) correcting an angle estimation distortion resulting from phase components injected as a result of the at least one of the different phase shift keying schemes that is not a power of two; b) correcting rotation phases in the values of the transformed data cube resulting from the value of at least one of the different phase-shift keying schemes that is not a power of two; and c) Avoid amplitude distortion caused by interbin misalignment of the ODDM-shifted peaks in the Doppler FFT spectrum.

The present invention discloses an alternative method for QPSK signal carrier synchronization, which mainly solves the problems of poor real-time performance and complex implementation of existing carrier synchronization technologies. Its implementation scheme is: in response to the needs of QPSK signal carrier synchronization, a sine signal and a cosine signal of the phase difference are calculated in real time; the phase difference interval is determined based on the obtained sine signal and cosine signal, and four phase shifts are performed on the received signal to obtain four interval signals; according to the phase correspondence between the four interval signals and the baseband signal at different phase differences and the determined phase difference interval, a certain interval signal that is in phase with the baseband signal is selected for output, and the sign bit of each interval signal is taken to finally restore the baseband signal. Compared with the existing carrier synchronization method, the present invention has good real-time performance, low processing delay, simple implementation, small amount of calculation, low resource consumption, and strong adaptability to deviation changes. It can be used for fast demodulation of QPSK signals in high-dynamic large-deviation Doppler frequency shift scenarios.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication method, device and system, and the method comprises the steps: generating a transmission frame which comprises a plurality of OFDM symbols; a first OFDM symbol of the transmission frame is a synchronous pilot symbol, and a second OFDM symbol is a reference pilot symbol; based on the transmission frame, configuring at least two demodulation modes according to channel conditions or communication requirements; when the first demodulation mode is configured, the receiving end performs differential phase shift keying differential demodulation on subsequent data symbols based on the reference pilot symbols; and when a second demodulation mode is configured, the receiving end performs channel estimation by using the reference pilot symbol, and performs quadrature amplitude modulation equalization and demodulation on subsequent data symbols according to a channel estimation result. According to the invention, ultralow pilot frequency overhead can be realized, the pilot frequency overhead is compressed to only two symbols, a synchronization sequence and a reference pilot frequency sequence in each frame, and the frequency spectrum utilization rate is greatly improved.

This application provides a short-range wireless communication method and a related device. The method includes: generating a transmission frame. The transmission frame includes a frame header and a data domain, phase shift keying modulation is used for the frame header, and quadrature amplitude modulation or phase shift keying modulation is used for the data domain. The method includes sending the transmission frame. In this application, the phase shift keying modulation is used for the frame header of the transmission frame, and the phase shift keying modulation or the quadrature amplitude modulation with a same bandwidth is used for the data domain.

The invention provides a signal synchronization method and device based on phase shift keying and a spectrum analyzer, and relates to the technical field of signal synchronization. In the application, first, first frequency offset estimation can be performed on a to-be-synchronized signal to obtain a first frequency offset corresponding to the to-be-synchronized signal, and frequency offset compensation is performed on the to-be-synchronized signal based on the first frequency offset to obtain a first frequency offset compensation signal corresponding to the to-be-synchronized signal; secondly, performing second frequency offset estimation on the first frequency offset compensation signal to obtain a second frequency offset corresponding to the to-be-synchronized signal, and performing frequency offset compensation on the to-be-synchronized signal based on the second frequency offset to obtain a second frequency offset compensation signal corresponding to the to-be-synchronized signal; and then, outputting a synchronization signal based on the second frequency offset compensation signal to obtain a target synchronization signal corresponding to the to-be-synchronized signal. Based on the above content, the problem of poor signal synchronization effect in the prior art can be improved.

The invention discloses a precise deception jamming signal photonics generation method for a synthetic aperture radar (SAR), and relates to the field of optical communication, microwave technology and electronic countermeasure. According to the method, a laser device LD, a dual-polarization quadrature phase shift keying modulator DP-QPSK, a bridge, an arbitrary waveform generator AWG, an optical band pass filter OBPF, an erbium-doped fiber amplifier EDFA, a polarization controller PC, a polarizer Pol and a photoelectric detector PD are included. According to the invention, high-fidelity false target deception can be realized by using only one DP-QPSK modulator, a template signal generation method directly used for a microwave photon frequency conversion system is designed, complex signal processing is not needed, SAR deception jamming signals can be generated through one photon mixing, the signal processing complexity is reduced, and the signal processing efficiency is improved. The method is simple in structure, good in real-time performance and high in parameter reconfigurable capability, a false target image is highly similar to a real target, effective cheating can be achieved, the method conforms to the future development trend of an electronic countermeasure system, and the method has application value in the fields of future radar electronic warfare and the like.

A phase shift keying modulator. The modulator comprises: a plurality of silicon waveguides provided in a device layer of a silicon-on-insulator platform, the silicon-on-insulator platform including one or more cavities; one or more III-V semiconductor based devices located within the one or more cavities of the silicon-on-insulator platform, each III-V semiconductor-based device including a III-V semiconductor based waveguide which is coupled at an input end to one of the plurality of silicon waveguides and coupled at an output end to another of the plurality of silicon waveguides, each III-V semiconductor based waveguide comprising an active phase modulating portion; and one or more contacts in electrical contact with each active phase modulating portion, such that the phase shift keying modulator is operable to modulate the phase of an optical wave passing through each active phase modulating portion.

The invention discloses a thin-film lithium niobate heterogeneous integrated high-performance balanced photoelectric detector, which is characterized in that an III-V wafer and a thin-film lithium niobate wafer are bonded together by using a wafer bonding technology, and an III-V epitaxial structure is formed by growing through metal organic chemical vapor deposition; the device sequentially comprises a p-type contact layer, an InGaAs absorption layer, a quaternary layer, a cliff layer, a drift layer, an InP sacrificial layer and an n-type contact layer. The balanced photoelectric detector disclosed by the invention shows a high bandwidth of 55GHz and a common-mode rejection ratio greater than 10dB; the method is applied to a coherent detection system, and error-free transmission of 50GBad and 100GBad quadrature phase shift keying signals and high-quality receiving of 80GBad and 100GBad 16-order quadrature amplitude modulation signals are realized.

The invention relates to the field of wireless power transmission, and discloses a multi-tone phase shift keying modulation method and receiving device for information energy transmission, and the device comprises a receiving unit which is used for receiving a multi-tone phase shift keying radio frequency signal; the integrated receiving rectifier is connected with the receiving unit, comprises a matching network, a Schottky diode and a low-pass filter, and is configured to convert the multi-tone phase shift keying radio frequency signal into a direct current output and a baseband frequency signal; and the demodulation unit is connected with the output end of the integrated receiving rectifier and is configured to demodulate symbol information based on the phase of the frequency signal. According to the invention, the power consumption and complexity of the receiving end are reduced, the power conversion efficiency is improved, the output fluctuation can be effectively reduced, the method is suitable for low-power-consumption wireless communication scenes such as Internet of Things terminals, and the dual requirements of wireless information transmission and energy transmission are effectively considered.

The invention discloses a PLC interactive wireless signal conversion method and system, and relates to the technical field of PLC communication protocol conversion, and the method comprises the steps: analyzing a space-time pulse sequence, recognizing and extracting a core control element, and forming triple data; calculating a chaos state variable in real time based on a Lorentz differential equation set, and mapping the chaos state variable into a carrier frequency offset; injecting the triple data into a carrier modulator, obtaining a dynamic carrier frequency through a carrier frequency offset and a basic frequency, and performing phase shift keying modulation to generate a radio frequency signal; inputting the demodulated triple data into a pulse neural network for decoding, reconstructing an original industrial protocol data stream, and outputting the original industrial protocol data stream to a second PLC through an Ethernet port to execute a control instruction; the communication robustness and the decoding accuracy are improved; the wireless signal has adaptive frequency hopping capability and higher spectrum utilization rate, and the communication stability and real-time response performance under the industrial field multi-interference condition are obviously enhanced.

A programmable digitally-controlled oscillator (DCO) for time-domain symbol generation is described in an embodiment. The programmable DCO comprising: an odd number (n) of multi delay cells (MDGs) to form a ring oscillator, the odd number (n) being equal to or more than three, and the odd number (n) of MDCs being adapted to generate n-1 number of multiplexed phases for phase shift keying (PSK) modulation, wherein each of the n number of MDCs comprises: two or more multi jitter cells (MJCs), each of the two or more MJCs being adapted to activate a corresponding delay for tuning a period of one cycle to represent a corresponding bit of a frequency shift keying (FSK) modulation, wherein each of the two of more MJCs comprises: two or more replica basic delay cells (BDCs) configured to adjust jitter, wherein each of the two or more replica BDC is adapted to provide a predetermined jitter target and comprises: two or more sets of reconfigurable inverter gates having different channel lengths and corresponding frequency ranges, the two or more reconfigurable inverter gates being selectable based on a target frequency range. A backscattered software-defined radio (SDR) transmitter system is also described in an embodiment.