129 results about "Diversity gain" patented technology

Disclosed in the present invention is an integrated sensing and communication (ISAC) cooperative transmission method based on a space-time block coding (STBC) OFDM signal, comprising: establishing an ISAC cooperative transmission system model based on an STBC-OFDM signal, and receiving an integrated signal echo containing state information of an unmanned aerial vehicle while implementing joint transmission to the unmanned aerial vehicle performed by multiple base stations using an STBC-OFDM integrated signal; the unmanned aerial vehicle pre-processing received communication signals to achieve orthogonal separation of s2m-1 and s2m and cooperative transmission diversity gain; processing echo signals received by a first base station and a second base station to acquire observation information of the first base station and the second base station for the unmanned aerial vehicle; implementing multi-base station cooperative tracking and trajectory prediction of the unmanned aerial vehicle by using an extended Kalman filter method; and the base stations uploading observation parameters to a control center by means of fronthaul links, and the control center fusing sensing results of the multiple base stations and performing tracking and prediction on the trajectory of the unmanned aerial vehicle by using the extended Kalman filter method.

The invention belongs to the technical field of wireless communication and terminals, and relates to a signal generation method and device, communication, a system storage medium and electronic equipment. The method comprises the steps of generating a to-be-approximated binary keying signal OOK waveform based on a low-power wake-up (LP-WUS) signal, and performing phase rotation on the to-be-approximated OOK waveform by adopting a sequence comprising a plurality of phase rotation factors which have the same module value and the phase changes according to a preset rule so as to obtain a phase rotation OOK waveform. According to the LP-WUS signal processing method and the LP-WUS signal processing device, the frequency diversity gain of the LP-WUS signal can be improved by performing phase rotation on the time domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has relatively high anti-fading capability, and the detection rate and the detection accuracy of the LP-WUS signal are improved.

The invention provides a signal generation method and device and a communication system, and relates to the technical field of wireless communication and terminals. The method comprises the following steps: scattering a to-be-approximated binary keying signal OOK waveform generated based on a low-power wake-up LP-WUS signal to obtain to-be-processed waveforms with different phases; carrying out DFT (Discrete Fourier Transform) pre-coding or LS (Least Squares) optimization on the waveforms to be processed with different phases to obtain frequency domain signals corresponding to the waveforms to be processed; and obtaining a target frequency domain signal with the same frequency domain bandwidth as the LP-WUS signal based on the frequency domain signal. According to the embodiment of the invention, the method can improve the frequency diversity gain and spectrum efficiency of the LP-WUS signal, improves the detection precision and detection efficiency of the LP-WUS signal, improves the receiving synchronism of NR, and reduces the energy loss.

The present invention discloses a UAV communication system, including a UAV end, a ground end, a communication link sending module and a communication link receiving module. The communication link sending module is used to carry TB on channel time-frequency resources and send it to the communication link receiving module according to a preset resource allocation scheme; the communication link receiving module is used to distinguish different TBs and different copies of TBs, and screen according to two TB indication fields in the correctly received TBs to obtain valid data contained in the TBs. The present invention carries the transmission blocks to be repeatedly sent on the redundant channel resources of the UAV communication link, and sends copies of the same TB on channel resources with different frequencies and / or different times to obtain the effect of additional frequency diversity gain and / or time diversity gain, compensating for the adverse effects of the frequency selective fading and / or time selective fading characteristics of the wireless channel on the correct reception of the signal, so as to achieve the purpose of making full use of the available channel resources to improve the quality and reliability of link data transmission.

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.

The invention discloses a wireless audio data transmission method, device and system. The method is applied to a first device, the first device comprises a main processor and at least two controllers, and the method comprises the following steps: if the first device is in a first working mode, at least starting the two controllers, and simultaneously receiving audio data groups sent by a second device in batches in a current equal-time-interval batch sending time slot, each started controller generates an acknowledgement data packet carrying acknowledgement information according to the receiving condition of the controller per se to the audio data group within the current equal time interval and the receiving condition of the first equipment to the audio data group sent by the second equipment before the current equal time interval; and sending a self-generated confirmation data packet to the second equipment in a batch confirmation time slot of the current equal time interval in a time-sharing manner. According to the method, the retransmission rate can be effectively reduced through the space diversity gains provided by the plurality of controllers of the first equipment, the bandwidth efficiency and the transmission reliability of wireless transmission of the audio data are improved, and the bandwidth requirement is met.

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.

The present disclosure relates to the technical field of wireless communications and terminals, and provides a signal generation method and apparatus, and a communication system. The method comprises: replacing some waveforms of each cycle among OOK waveforms to be approximated with constant modulus sequences, the constant modulus sequences being a group of sequences having the same modulus value but different phases. According to embodiments of the present disclosure, OOK waveforms to be approximated can be dispersed to improve frequency diversity gains of signals and form an effect similar to spread spectrum, so that the signals can still have good performance when passing through frequency-selective fading channels (for example, TDL-C), thereby improving the detection accuracy and the detection efficiency of the signals, improving the NR reception synchronization and reducing energy loss.

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 invention provides a signal generation method and device and a communication system, and relates to the technical field of wireless communication and terminals. The method comprises the steps that on the basis of a low-power wake-up LP-WUS signal, a binary keying signal OOK waveform to be approximated is generated, a constant modulus sequence is used for replacing a part of waveform of each period in the OOK waveform to be approximated so as to obtain a target waveform, and the constant modulus sequence is a set of sequences with the same modulus value but different phases. According to the embodiment of the invention, the to-be-approximated OOK waveform generated based on the LP-WUS signal can be scattered, the frequency diversity gain of the LP-WUS signal is improved, and an effect similar to spread spectrum is formed, so that the signal can still have good performance when passing through a frequency selective fading channel (such as TDL-C), the detection precision and the detection efficiency of the LP-WUS signal are improved, and the detection efficiency of the LP-WUS signal is improved. And therefore, the NR receiving synchronism is improved, and the energy consumption loss is reduced.

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 provides a communication method and device. The method provides a scheme capable of effectively reducing the influence of channel quality on data transmission. The method comprises the following steps: a sending device sends information to be transmitted to a receiving device within N periods of time, the N periods of time include at least two periods of time, and frequencies associated with the information respectively transmitted within the two periods of time are different, for example, first information transmitted within the ith period of time is associated with a first frequency, and second information transmitted within the pth period of time is associated with a second frequency, the first frequency is different from the second frequency, and i is not equal to p. Thus, the information is transmitted by adopting different frequencies, the frequency diversity gain of signal transmission can be improved, the situation that the whole information is lost due to the fact that the channel quality corresponding to a certain frequency is poor can be avoided, and the influence of the channel quality on data transmission can be effectively reduced.

The invention provides a coherent chaotic communication method and system with receiving diversity gain, and relates to the technical field of wireless communication, and the method comprises the steps: presetting Logistic sequence first value vectors at a transmitting end and a receiving end, and respectively generating chaotic sequences; a chaotic sequence generated by a receiving end is subjected to reverse convolution operation to obtain a cross-correlation vector, then the cross-correlation vector is subjected to square detection operation to obtain diversity gain of a received signal multipath channel, and finally a serial number of a selected chaotic initial value in the vector of the chaotic initial value is solved and bit conversion is performed to obtain a corresponding estimation information bit. The system has higher energy efficiency, uses less energy under the condition of realizing the same bit error rate of a multi-carrier differential shift keying communication system, can realize coherent detection without executing chaotic synchronization, and can realize high-performance communication in a multipath Rayleigh fading channel scene.

The present application provides a communication method and apparatus. The method provides a scheme in which the influence of channel quality on data transmission can be effectively reduced. The method comprises: within N time periods, a sending device sends to a receiving device information to be transmitted, wherein the N time periods comprise at least two time periods, the frequencies associated with information respectively transmitted within the two time periods are different, for example, first information transmitted within an i-th time period is associated with a first frequency and second information transmitted within a p-th time period is associated with a second frequency, the first frequency is different from the second frequency, and i is not equal to p. Therefore, by using different frequencies to transmit information, the frequency diversity gain of signal transmission can be improved, and the loss of the whole information due to poor channel quality corresponding to a certain frequency can be avoided, thereby effectively reducing the influence of channel quality on data transmission.

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.