105 results about "Diversity gain" patented technology

The invention provides an RLS channel estimation method, device, equipment and medium for a single-carrier underwater acoustic communication system, and the RLS channel estimation algorithm combines the sparsity characteristic of an underwater acoustic channel and the diversity gain of bidirectional estimation, and can significantly improve the precision and convergence rate of channel estimation. The method is especially suitable for an underwater acoustic communication system in a complex time-varying and multi-path sparse environment.

The invention discloses a diversity combining method and system for soft demodulation output, and relates to the technical field of wireless communication. The method comprises the following steps: receiving a plurality of antenna signals, and acquiring a signal-to-noise ratio of each signal receiving path as an input parameter; establishing a Taylor expansion model based on the relationship between the signal-to-noise ratio and the log-likelihood ratio, and searching an optimal polynomial fitting formula coefficient; calculating a weighting coefficient of each signal receiving path according to an optimization formula, wherein the weighting coefficient is generated by a polynomial function of a signal-to-noise ratio; and carrying out weighted summation on the log-likelihood ratios of all the signal receiving paths according to the calculated weighting coefficient. According to the method, the weighting coefficient of bit-level signal combination is optimized, and the optimal weighting coefficient is determined in a manner of Taylor expansion at a zero point, so that the defect that the diversity gain is reduced when the signal-to-noise ratio difference is relatively large in a traditional method is overcome, the bit error rate performance under a complex channel condition is remarkably improved, and the reliability and the anti-interference capability of a system are enhanced.

A resource determination method and apparatus, relating to the field of communication technology, is used to improve the diversity gain that can be obtained by a PDCCH candidate. The method comprises the following steps: a communication device determines the index values ​​of n first CCEs occupied by a PDCCH candidate in a first CCE set, and the index values ​​of m second CCEs occupied by a PDCCH candidate in a second CCE set; the CORESET is divided into a first physical time-frequency resource region and a second physical time-frequency resource region, the first physical time-frequency resource region is different from the second physical time-frequency resource region in the time domain and / or frequency domain, the number of CCEs included in the first CCE set is determined according to the number of REGs included in the first physical time-frequency resource, the number of CCEs included in the second CCE set is determined according to the number of REGs included in the second physical time-frequency resource, and the sum of m and n is equal to the aggregation level of the PDCCH candidate; thereafter, the communication device determines the physical time-frequency resources occupied by the PDCCH candidate according to the index values ​​of the n first CCEs and the index values ​​of the m second CCEs.

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 invention discloses an underwater acoustic single carrier communication frequency domain array processing method based on an ultra-short baseline array, and belongs to the field of underwater acoustic communication. The problem that an existing communication system based on an ultra-short baseline receiving array is poor in reliability is solved. According to the method, a high-precision time delay estimation method in underwater acoustic positioning is adopted to carry out refined estimation on propagation time delays of M receiving channels, and the influence of different decimal time delays on channel estimation results of all the channels is eliminated. And comparing the signal-to-noise ratio after multi-channel combination with the signal-to-noise ratio of a single channel to obtain condition limitation required during equal gain selection combination of the multiple channels, and judging whether a standard channel and an alternative channel are combined or not according to the condition of channel combination so as to continuously improve the signal-to-noise ratio of a received signal and obtain a space diversity gain. The reliability of a communication system is improved, and the inter-channel interference of a traditional method is effectively avoided. The method can be applied to underwater acoustic single carrier communication frequency domain array processing of an ultra-short baseline array.

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 application discloses a data transmission method, apparatus, device and storage medium on unlicensed spectrum, belonging to the field of communication technologies. The method includes: when a terminal is unable to send first data on a first uplink resource, the terminal determines a second uplink resource according to a second uplink resource configuration, where the first uplink resource corresponds to a first uplink resource configuration, and the first uplink resource configuration and the second uplink resource configuration are two different resource configurations of the same uplink BWP; the terminal sends the first data on the second uplink resource. The technical solution provided by the embodiments of the present application helps to improve the transmission opportunity of uplink data and the diversity gain by configuring multiple uplink resource configurations for the same uplink BWP.

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 invention belongs to the field of wireless optical communication, and particularly relates to an optical FBMC (Fiber Baseboard Management Controller) dual-mode index modulation communication system and a signal detection method thereof, comprising the following steps: Step 1: transmitting two constellation modes by using all available subcarriers, and simultaneously retaining diversity gain of index modulation; 2, optimizing a dual-mode constellation through phase rotation and amplitude scaling, and generating an optimal constellation suitable for the optical FBMC system; 3, designing a deep learning assisted signal detection algorithm, and detecting the sent information; and Step 4, optimizing hyper-parameters of a signal detection algorithm by using an artificial mouse algorithm. Simulation and experiment results show that the system improves the bit error rate performance of the system through the constellation design, and realizes the bit error rate performance close to maximum likelihood detection on the premise of greatly reducing the detection complexity.

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.

This application discloses a tag quantity estimation system and method of RFID. A processor-readable medium was disclosed at the same time. This estimation method applies a spatial diversity gain existing in a multi-antenna system. Separated and sequentially stacked the real parts and the imaginary parts of the multiple signals received by multiple antennas. Then, a tag quantity estimation problem is converted into a data clustering problem in high-dimensional space. In this way, the overlapped cluster data in low-dimensional space can be separated in the high-dimensional space, thereby improving the accuracy of tag quantity estimation.

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.

Example embodiments of the present disclosure relate to communications. According to embodiments of the present invention, a network device sends configuration information for one or more frequency hopping patterns to a terminal device. Based on the configuration information, the terminal device determines which frequency hopping pattern to use and determines multiple frequency hopping positions. This allows for more frequency hopping positions, thereby achieving greater frequency diversity gain and facilitating coverage enhancement. Furthermore, the frequency hopping frequencies can be configured more flexibly.

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 invention provides a communication method and device. The method comprises the steps that terminal equipment sends a first symbol group at a first frequency position, then the terminal equipment sends a second symbol group at a second frequency position, the first frequency position and the second frequency position are different, and the first symbol group and the second symbol group are included in a plurality of symbol groups. The plurality of symbol groups are determined according to first data of the terminal equipment and a first sequence corresponding to the terminal equipment, and the first sequence is included in a modulation sequence set. By using the symbol group as a unit and performing frequency hopping transmission of the symbol group at different frequency positions, a better frequency diversity gain can be obtained, and the robustness of data demodulation performance can be improved, so that the performance loss caused by the fact that a plurality of symbol groups are in channel deep fading at the same time can be avoided or reduced, and the coverage can be improved.

The present invention discloses a method for enhancing the coverage of an NR system for wireless devices with limited coverage. Through RRC signaling, DCI or RAR authorization, a serving base station can configure parameters for a UE with limited coverage to enable the UE to operate in a coverage enhancement mode. When connected and communicating with the serving base station, the UE can use the configuration parameters to determine whether to enter the coverage enhancement mode. When receiving PDSCH and PDCCH channels, when transmitting PUSCH and PUCCH channels, and when transmitting PUSCH Msg3 during random access, the configuration parameters can configure the UE to use both time diversity and frequency diversity to expand and enhance coverage. Advantageously, the base station can flexibly and dynamically configure coverage enhancement parameters for the UE to use time diversity and frequency diversity gains to expand the coverage of the UE as the UE moves around.

The present disclosure provides an uplink channel transmission method, apparatus, device and readable storage medium, which relate to the field of wireless communications. The method comprises: a network device sends transmission indication information to a terminal device, the transmission indication information is used to indicate a first repetitive transmission scheme for sending PUSCH, the first repetitive transmission scheme is a combination of an inter-time slot repetitive transmission scheme and an intra-time slot beam hopping scheme; the terminal device sends PUSCH to multiple TRPs of the network device in accordance with the first repetitive transmission scheme. In an embodiment of the present application, while the terminal device obtains beam diversity gain through the intra-time slot beam hopping scheme, it can also improve the transmission reliability of PUSCH through the inter-time slot repetitive transmission scheme, which can effectively combat performance deterioration under congestion and deep fading conditions, and achieve more flexible adaptation to service requirements with different delays and performance.

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 invention discloses a device and method for improving the anti-noise performance of a vortex optical multiplexing communication system, and the device comprises a signal transmitting module which loads a signal to signal light through an optical coupler, and achieves the decorrelation of two paths of signals through an optical fiber delay line. The vortex light multiplexing and demultiplexing module couples signal light to a free space, generates linearly polarized light through a Glan prism, generates left-handed and right-handed circularly polarized light through a wave plate, generates vortex light beams through a metasurface for coaxial multiplexing transmission, and a receiving end demultiplexes signals through the metasurface and recouples through an optical fiber-space coupler. And the multiple-input multiple-output diversity gain module is used for carrying out polarization conversion on the demultiplexed signal, carrying out electric signal conversion through a photoelectric detector, and finally carrying out signal equalization processing through a computer. According to the invention, the anti-interference capability is effectively improved, the signal transmission quality is improved, and the method has relatively strong anti-noise performance and higher communication sensitivity.

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.

Wireless devices can use various super-slot formats to facilitate wireless communications using half-duplex (HD) frequency division duplex (FDD) (HD-FDD). A super-slot has a duration that can span multiple slots and / or subframes. A super-slot can include uplink symbols and downlink symbols. A super-slot can include a guard period that separates uplink symbols from downlink symbols in the same super-slot. A super-slot can support signal repetition to provide coverage enhancement. Signal repetition can be combined with frequency hopping in a super-slot to provide diversity gain.