61 results about "Diversity gain" patented technology

A multi-step coherent combination of signals received by multiple distributed phased antenna arrays to increase the coverage area of the distributed phase antenna arrays while decreasing the loss of such antennas, particularly in sections of a service area that traditionally are not covered by such antennas. More particularly, the solution presented herein coherently combines, in a multi-step coherent combination process, two or more data streams from two or more Phased Array Antenna Modules (PAAMs) to generate output data for the corresponding wireless device. In so doing, the solution presented herein achieves diversity gain in some scenarios, e.g., when adjacent PAAMs have partially overlapping frequency ranges, facilitates unsymmetrical BW support for uplink (UL) and downlink (DL) implementations, and / or provides service to more users.

The application relates to the technical field of radars and unmanned aerial vehicles, and particularly discloses a combined radar unmanned aerial vehicle direction finding system. The system comprises at least two radars, a central data processing unit and a direction finding fusion decision unit, and through the cooperation of the multiple radars, target echo signals are collected, multi-dimensional features such as amplitude, micro-Doppler and polarization are extracted, and combined azimuth calculation is carried out based on evidence theory, and finally high-precision direction finding results are output. The system utilizes spatial and frequency diversity gains, combines feature-level to decision-level fusion, and improves the direction finding reliability, environmental adaptability and anti-interference capability.

The present disclosure provides a signal generation method, device and communication system, relating to the technical field of wireless communication and terminal. The method comprises: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal, replacing part of the waveform of each period in the first OOK waveform with a constant modulus sequence to obtain a target waveform, the constant modulus sequence being a group of sequences with the same modulus but different phases. According to the embodiment of the present disclosure, the first OOK waveform generated based on the LP-WUS signal can be scattered, the frequency diversity gain of the LP-WUS signal is improved, a similar spread spectrum effect is formed, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), so as to improve the detection accuracy and detection efficiency of the LP-WUS signal, and further improve the synchronization of NR reception and reduce energy loss.

The present application provides a communication method and apparatus. The method comprises: a terminal device sends a first symbol group at a first frequency position, and then, the terminal device sends a second symbol group at a second frequency position, wherein the first frequency position is different from the second frequency position, the first symbol group and the second symbol group are included in a plurality of symbol groups, the plurality of symbol groups are determined on the basis of first data of the terminal device and a first sequence corresponding to the terminal device, and the first sequence is contained in a modulation sequence set. By performing frequency hopping transmission of symbol groups at different frequency positions using symbol groups as units, a better frequency diversity gain can be obtained, helping to improve the robustness of the data demodulation performance, such that performance loss caused by a plurality of symbol groups simultaneously undergoing deep channel fading can be avoided or reduced, and the coverage can be improved.

The invention relates to the technical field of optical communication, and discloses a mode diversity receiving system and method based on all-fiber coherent synthesis, and the system comprises a photon lantern receiving module, a cascade double-coupling module, a signal monitoring module, a control and feedback module, and a coherent detection module. Spatial optical signals influenced by atmospheric turbulence are firstly coupled into the few-mode optical fiber of the photon lantern to be received, multi-mode optical signals are excited and converted into multiple paths of single-mode signals, then coherent combination is carried out through the cascade double-coupling module, and the signal monitoring module monitors a beam combination result in real time. And the control and feedback module actively controls and compensates the phases of the multiple paths of single-mode signals, and photoelectric conversion and digital signal processing of the combined optical signals are completed by the coherent detection module. The influence of atmospheric turbulence on power imbalance in optical domain mode diversity is eliminated through active control and cascade double coupling, so that mode diversity gain is obtained, and adaptability of a space laser communication or radar system to the atmospheric turbulence is remarkably enhanced.

The invention discloses a communication method and device, a computer program product and a readable storage medium. The communication method comprises the following steps: determining a frequency point switching position; switching a sending frequency point of a radio frequency carrier from a first frequency point to a second frequency point at the frequency point switching position; the frequency point switching position is determined based on uplink data received on the first frequency point or a third frequency point, and the third frequency point is associated with the first frequency point. By adopting the scheme, the frequency diversity gain can be obtained, and the uplink transmission performance is improved.

The application discloses a method for three-dimensional positioning of a two-coordinate radar assisted by RIS, comprising the following steps: a direct receiving channel and an auxiliary receiving channel of a target echo signal are constructed by combining the RIS with the two-coordinate radar; a measurement information error equation of a target is constructed according to the two-coordinate radar assisted by the RIS; and a value of the target position is estimated according to the measurement information error equation of the target. In the application, a single or multiple RIS is introduced into a same detection beam, the characteristics of a wide-beam in the elevation direction of a two-coordinate radar station are combined, a virtual multi-station receiving channel in the elevation direction is constructed, the spatial diversity gain of the two-coordinate radar is explored, and the three-dimensional positioning of a target is realized by using the redundant information. The RIS has low power consumption and low cost, can be carried by a UAV to be moved at any time, can change the electromagnetic wave propagation direction by phase shifting, does not need data transmission for fusing information, and is easier to realize high-precision phase alignment.

The invention discloses a signal recovery method assisted by spatial modulation and space-time codes, which comprises the following steps of: 1, performing spatial modulation on information bit stream groups according to the number of time slots and the number of carriers to obtain spatial modulation symbols; 2, mapping the spatial modulation symbols into a space-time coding structure; 3, performing orthogonal time-frequency-space multi-carrier modulation on the spatial modulation symbols with the same transmission period, and transmitting the data symbols on a plurality of transmitting antennas respectively; and step 4, carrying out signal detection recovery on the transmission data symbols obtained in the step 3 based on the special sparsity of the signal structure. The method is used for recovering various source end signals which cannot be directly measured, high transmission rate and high diversity gain are realized, and the problems of poor signal detection performance and relatively high calculation complexity in the signal recovery process of a multi-antenna multi-carrier system are solved.

The invention discloses an RSMA wireless communication system secure transmission method based on STAR-RIS, and belongs to the technical field of wireless communication. Based on a related Rayleigh fading channel model, a cascade channel average gain from a base station to a user through STAR-RIS is firstly deduced, a simplified analysis method is provided, the average channel gain is directly used for deducing a closed expression of a system security outage probability (SOP), and the secure diversity gain characteristic of the system is further determined by analyzing the asymptotic SOP of a high signal-to-noise ratio area; the security performance of the method is obviously better than that of an STAR-RIS assisted NOMA scheme and an STAR-RIS assisted OMA scheme, and the flexible resource allocation mechanism of the method has more advantages in interference control and secure transmission guarantee; according to the method, the power distribution coefficients of the public information and the private information of the RSMA are optimally designed, the rate and power ratio of the two types of information streams can be dynamically and flexibly adjusted according to the actual situation, and the appropriate balance of the transmission security of the two types of information streams is realized.

The application discloses a data transmission method, device and communication equipment, and belongs to the technical field of communication. The data transmission method comprises the following steps: a terminal acquires frequency domain unit-based frequency hopping configuration information of a physical channel or a signal; and the terminal performs data transmission or reception according to the frequency domain unit-based frequency hopping configuration information. The application configures the frequency domain unit-based frequency hopping configuration information for the physical channel or the signal, performs frequency hopping based on the frequency domain unit-based frequency hopping configuration information, can acquire frequency diversity gain, and can further improve the performance of receiving a downlink signal and the system capacity.

The invention provides a power distribution transmission method and device under an OCDM frequency selection channel, and the method comprises the steps: converting a time domain signal into a frequency domain through a discrete Fourier transform matrix at a transmitting end, generating a power distribution matrix through combining channel state information and adopting a water injection algorithm, and carrying out the dynamic power precoding of a frequency domain subcarrier; generating a time domain OCDM signal through an inverse discrete Fourier transform matrix and an inverse discrete Fresnel transform matrix, adding a cyclic prefix, and transmitting the time domain OCDM signal; after a receiving end is subjected to prefix removal, a discrete Fourier transform matrix is converted into a frequency domain, a frequency domain equalizer is designed on the basis of a minimum mean square error criterion by utilizing channel diagonalization characteristics, signals are equalized in combination with transmitting power information, and finally time domain information is recovered through an inverse discrete Fourier transform matrix; therefore, the problem of traditional power distribution failure caused by OCDM channel energy dispersion is solved, and through receiving and transmitting joint optimization, diversity gain is fully mined, frequency selective channel fading is adaptively matched, the anti-interference and anti-multipath capabilities of the system are improved, and the spectrum efficiency and the transmission performance are maximized.

The invention provides a space-time WALSH coding method and device under an MIMO channel, and relates to the technical field of communication. According to the technical scheme provided by the invention, the cross-correlation function between the pilot frequency and the local pre-stored sequence is calculated for each transmission path between each transmitting antenna and the corresponding receiving antenna, scalar superposition is carried out on the cross-correlation function of each transmission path to obtain the composite correlation function, and the maximum power point is searched according to the correlation peak of the composite correlation function. And the phase deviation and the frequency deviation are calculated according to the phase deviation and the frequency deviation, so that the mismatching problem of each transmission path in an MIMO (Multiple Input Multiple Output) channel is effectively compensated. The space diversity gain provided by the MIMO channel is fully utilized through maximum ratio combination, and the signal-to-noise ratio of the combined signal is improved. According to the scheme, WALSH code spread spectrum, joint channel estimation, space diversity combining and other technologies are comprehensively utilized, and transmission of control information can be accurately and effectively achieved under an MIMO channel.

The application discloses a diversity combining method, device, equipment and storage medium, and the method comprises the following steps: acquiring signal data of multiple signals; the signal data comprises the amplitude of each signal and noise, and the signal data is sent to a receiving module after the source signal is sequentially scrambled, encoded, interleaved, modulated and diversity processed by a sending module; each signal comprises multiple frequency points; the interference filtering threshold of each signal is calculated according to the amplitude of each signal and noise, and the frequency point amplitude of all frequency points in each signal is calculated; based on the frequency point amplitude and the interference filtering threshold of all frequency points, the frequency points not disturbed are combined to obtain a combination result. According to the scheme, the receiving module can filter out the interference information of multiple disturbed different signal data of the message by using the frequency point selection combining method, so as to restore the transmission message, thereby obtaining the diversity gain with small complexity, improving the sensitivity of signal receiving, and making the acquired signal more accurate.

The invention provides a multi-station cooperation point cloud level fusion sensing method, device and system, electronic equipment and a storage medium, and relates to the technical field of wireless. According to the method, a sensing overlapping coverage area is determined, so that all multi-station cloud data does not need to be adopted during target matching, only first multi-station cloud data in the sensing overlapping coverage area needs to be utilized, and the target matching efficiency is improved. The method can reduce the amount of point cloud data needing target matching, and greatly reduces the complexity and mismatching probability of a point cloud level fusion algorithm. Moreover, the reliability evaluation values of the data points are introduced in the method, and the reliability of each data point is applied to weighted clustering, so that the fusion diversity gain of the sensing overlapping coverage areas of the plurality of base stations can be improved, the point cloud level fusion precision is further improved, and the accuracy of the target position obtained after point cloud fusion is improved.

The application belongs to the technical field of wireless communication and terminal, and relates to a signal generation method, device, communication, system storage medium and electronic equipment. The method comprises the following steps: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal; and performing phase rotation on the first OOK waveform by using a sequence containing a plurality of phase rotation factors with the same modulus and a preset rule of phase change, so as to obtain a phase-rotated OOK waveform. According to the application, the frequency diversity gain of the LP-WUS signal is improved by performing phase rotation on the time-domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has strong anti-fading capability, and the detection rate and detection accuracy of the LP-WUS signal are improved.

The application belongs to the technical field of wireless communication and terminal, and relates to a signal generation method, device, communication, system storage medium and electronic equipment. The method comprises the following steps: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal; and performing phase rotation on the first OOK waveform by using a sequence containing multiple phase rotation factors with the same modulus and the phase changing in a preset rule, so as to obtain a phase-rotated OOK waveform. According to the application, the frequency diversity gain of the LP-WUS signal is improved by performing phase rotation on the time-domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has strong anti-fading capability, and the detection rate and detection accuracy of the LP-WUS signal are improved.

The application relates to the technical field of wireless communication and digital signal processing, and discloses a modulation signal transceiving system and method based on IQ domain maximum ratio combining, specifically, a Delta-Sigma modulation technology is used at a transmitting end to convert a high-order modulation signal into a low-bit stream, and the precision requirement of a data converter is significantly reduced; an IQ domain maximum ratio combining mechanism is introduced at a receiving end, after IQ imbalance is corrected through digital preprocessing, dynamic weighted combining is carried out according to the signal-to-noise ratios of all receiving branches, and diversity gain is effectively utilized. Through the collaborative design of the transmitting end and the receiving end, the signal-to-noise ratio of the combined signal can be significantly improved under the conditions of high frequency and long distance transmission, the influence of channel fading and noise can be effectively inhibited, and thus the demodulation reliability and the overall robustness of the system can be greatly enhanced on the premise that the noise shaping characteristics of the Delta-Sigma modulation signal are not damaged.

Systems and methods are provided for conserving battery power of a UE during active communication with a non-terrestrial network (NTN) satellite. The systems and methods involve determining that unsupported antennas of the UE are active and deactivating the unsupported antennas. Further, the systems and methods include disabling a beam-sweeping functionality of the beamforming antenna of the UE within the NTN, upon determining the spatial orientation of the UE and adjusting the spatial orientation of the beamforming antenna toward the NTN satellite. In addition, the systems and methods determine that a MIMO functionality of the UE is active in the NTN coverage zone and disable the MIMO functionality of the UE in instances when the MIMO diversity gain is low.

The invention relates to a work control method and device of a vehicle-mounted radar system, a storage medium, a program product, equipment and a vehicle, and the method can select a phased array mode, an MIMO mode or a mixed mode of the vehicle-mounted radar system through the dynamic matching of the real-time working conditions of the vehicle to carry out environment detection, achieves the optimal configuration of the detection performance in different scenes, and improves the detection efficiency. The comprehensive detection performance of a vehicle-mounted radar system in a full scene is improved, the technical problem that a single-system radar cannot give consideration to energy efficiency, diversity gain and scene adaptability is solved, and the full-scene detection requirement of the vehicle-mounted radar in a vehicle-mounted environment is improved.

The application discloses a kind of cooperative channel access methods, consider that multiple untrusted relay nodes exist simultaneously, and the case of adopting non-collusion way eavesdropping source channel, in combination with cooperative interference mechanism, specifically designed safe channel access method.Based on the rational cooperation principle between user pairs, the communication nodes located in the same alliance can simultaneously act as the relay nodes of the other party, increasing the role diversity, and the same user pair can simultaneously join multiple alliances, fully utilizing the spatial and temporal diversity and relay diversity gain.For the overlapping alliance structure, in addition to detecting untrusted relays, further detection of alliance trusted relays is added, and by comparing the expected return functions of detecting different numbers of relay nodes, the optimal detection node and detection set are selected, to the greatest extent avoiding unnecessary detection overhead.

Method and a device in UE and base station for wireless communication. A first node receives a first signaling; transmits a first signal in a first time pool, and transmits a second signal in a second time pool. The first signaling is used to determine K time windows; the first time window and the second time window are respectively two time windows that are adjacent among the K time windows, the first time window and the second time window being respectively associated with a first reference signal and a second reference signal; whether a first condition set is satisfied is used to determine whether the first time pool comprises all multicarrier symbols in the first time window and / or whether the second time pool comprises all multicarrier symbols in the second time window. The above method satisfies the request for processing time of beam handover and improves the resource utilization ratio.

The application discloses a kind of MIMO transmission method and system using fluid antenna, and multiple fluid antennas that can freely move in given area are respectively arranged at transmitter and receiver side.This application establishes corresponding channel model and constructs optimization problem of maximum system achievable rate according to statistical channel information, to transmit fluid antenna position, receive fluid antenna position and transmit covariance matrix as optimization variable, and uses alternate optimization, Cauchy-Schwarz inequality and Taylor expansion to solve optimization problem to realize achievable rate maximization.This application uses fluid antenna that can freely move in given area in MIMO system, compared with the case that traditional MIMO uses fixed position antenna, this application can utilize more spatial degrees of freedom, obtain higher achievable rate and diversity gain.

The application discloses a kind of integrated signal generation and multi-target clustering identification method and device of feeling.This application uses unified AFDM waveform as bottom transmission mechanism, realizes full diversity gain in time-frequency plane by adjusting affine parameter, effectively suppresses the inter-subcarrier interference under high dynamic scene.In the receiving end, the distance-Doppler heat map is reconstructed by fast cyclic correlation radar algorithm, and the original detection point cloud is extracted combined with 2D-CFAR detection.Introduce the DBSCAN clustering algorithm based on dimensionless weight, and the scattered point is condensed into an independent entity target in RDM physical space, and the radial velocity characteristics of clustering centroid are used to construct automatic decision engine, to realize the real-time classification and identification of static obstacles and dynamic moving targets.The application solves the technical pain points of traditional ISAC system in high frequency, high mobility scene, such as sensing point fragmentation and confusion of static and dynamic targets.

Design methods of physical downlink control channel (PDCCH), user equipment and memory are proposed for next generation 5G new radio system. UE receives configuration of default control resource set (CORESET) in MIB / SIB from its serving base station. The default CORESET contains common search space and UE-specific search space for candidate PDCCH transmission. PDCCH in the default CORESET is mapped to physical resource in distributed or localized manner. Specifically, various REG-to-CCE mapping rules are proposed to improve frequency diversity gain or frequency selectivity gain, or to reduce latency of PDCCH processing. Furthermore, to facilitate analog beamforming in mmWave system, the default CORESET is transmitted in synchronization signal (SS) block associated with corresponding analog beam direction. The design methods of physical downlink control channel and related user equipment of the present invention can improve frequency diversity gain or frequency selectivity gain, or reduce latency of PDCCH processing.

This invention discloses an adjustable antenna-assisted dynamic beamforming optimization method for vehicular networks, belonging to the field of vehicular network and mobile communication technology. By establishing a comprehensive near-field multipath channel model incorporating scattering cluster distribution and geometric phase shift characteristics, this invention utilizes the position reconfigurability of a fluidic antenna system to achieve dynamic port switching within the limited space of the vehicular network terminal. This transforms multipath interference in near-field rich scattering environments into spatial diversity gain, solving the scientific problem that fixed ports cannot adapt to complex channel characteristics. Simultaneously, this invention proposes a low-complexity joint optimization algorithm based on the maximum transmission ratio and maximum signal-to-noise ratio criteria. Through closed-form solutions, it rapidly achieves the joint design of base station beamforming and terminal ports, significantly improving channel capacity without requiring only a single radio frequency link or increasing hardware costs. This effectively overcomes the stringent economic constraints of large-scale commercialization on hardware costs and computational latency.

According to aspects herein, methods and a non-transitory computer storage medium storing computer instructions for handover between extraterrestrial access points. The method begins with receiving, at a first extraterrestrial access point and a second extraterrestrial access point an uplink communication from a UE. Both the first extraterrestrial access point and the second extraterrestrial access point attempt to decode the uplink communication. The second extraterrestrial access point may transmit additional soft decoding bits to the first extraterrestrial access point. The uplink communication is decoded using the soft decoding bits and the additional soft decoding bits.

The invention discloses a cooperative communication relay selection method and a cooperative communication relay selection system for a non-identical interference environment, which mainly solve the problem that fine balance between diversity gain and interference cost cannot be realized under the scenes of different interference source power and path loss in the existing method. According to the scheme, the method comprises the following steps: constructing a cooperative communication model comprising a non-equal interference source, a source node, a destination node and a candidate relay, and defining a rhombic cooperative area to carry out space pre-screening; defining a relay successful decoding condition, and forming a decoding set by using all relays which are successfully decoded; constructing a comprehensive scoring function for candidate relays falling into the rhombic cooperation area in the decoding set, fusing a link signal-to-noise ratio and an interference level, and selecting all relays with scores not lower than a preset threshold to form a cooperation relay set; and the signals are forwarded in a descending order according to the scores, and the destination node combines the received relay signals to realize multi-relay cooperative transmission. The method can effectively reduce the outage probability and improve the throughput, and can be used for communication scenes such as cellular networks and unmanned aerial vehicle communication.

The embodiment of the invention provides a cooperative sensing method and device, and the method comprises the steps that a first device sends first request information to at least one second device, and the first request information is used for requesting the cooperative execution of a sensing measurement task; the first request information comprises first information, and the first information is used for indicating shared transmission duration when the sensing measurement task is cooperatively executed; and the subsequent first device receives a first response message of the at least one second device, wherein the first response message is used for indicating whether the cooperation requested by the first request information is accepted or not. In the scheme, after the at least one second device receives the first request information sent by the first device, according to the first information in the first request information, it is determined that the transmission time length can be shared while the sensing measurement task is cooperatively executed, so that the sensing measurement task can be cooperatively executed subsequently by sharing the transmission time length, and the transmission efficiency is improved. The efficiency of cooperative sensing can be improved, the overhead generated by cooperative sensing can be reduced, and the sensing diversity gain is realized.

The invention relates to the technical field of wireless communication and digital signal processing, and provides a modulation signal receiving and transmitting system and method based on IQ domain maximum ratio merging, and particularly, a Delta-Sigma modulation technology is adopted at a transmitting end, a high-order modulation signal is converted into a low bit stream, and the precision requirement for a data converter is remarkably reduced; an IQ domain maximum ratio merging mechanism is introduced at a receiving end, after IQ imbalance is corrected through digital preprocessing, dynamic weighted merging is carried out according to the signal-to-noise ratio of each receiving branch, and diversity gain is effectively utilized. Through collaborative design of the transmitting end and the receiving end, the signal-to-noise ratio of a combined signal can be remarkably improved and the influence of channel fading and noise can be effectively suppressed under high-frequency and long-distance transmission conditions, so that the signal-to-noise ratio of a Delta-Sigma modulation signal can be effectively improved on the premise of ensuring that the noise shaping characteristic of the Delta-Sigma modulation signal is not destroyed, and the signal-to-noise ratio of the Delta-Sigma modulation signal can be effectively improved. And the demodulation reliability and the overall robustness of the system are greatly enhanced.

The invention relates to a communication method and device and a storage medium. The communication method comprises the following steps: a terminal obtains first information, wherein the first information is used for indicating a mapping type of a data bit sequence; the terminal maps the data bit sequence into a symbol sequence according to the mapping type, symbols of different amplitudes in the symbol sequence correspond to b data bits of different states in the data bit sequence, and b is a positive integer; and the terminal sends the symbol sequence. In the embodiment of the invention, the terminal performs amplitude modulation on the data bit sequence according to the mapping type, namely, the data bit sequence is mapped into the symbol sequence. Amplitude modulation can obtain larger diversity gain and higher reliability in the Khatri-Rao domain, and uplink coverage enhancement is achieved.