31results about How to "Good spectral efficiency" patented technology

The invention provides a method for combining orthogonal multiple access and non-orthogonal multiple access under Cell-free Massive MIMO. All users are divided into L clusters, 1 or 2 users are located in each cluster, the users in each cluster use the same pilot frequency, and the users in different clusters use mutually orthogonal pilot frequencies, so that the number of orthogonal pilot frequencies is L; APs are randomly divided into two parts, one part is used for providing services for an OMA user, and the other part is used for providing services for an NOMA user; the downlink data transmission depends on conjugate beam forming, and the spectrum efficiency of the downlink data transmission of the single user is obtained; a power allocation algorithm is used to maximize a power control algorithm P1 of the minimum SINR, and power control is converted into a convex optimization problem P2; the solution of the downlink maximum minimum SINR is found for the convex optimization problem P2 by using a binary search method, orthogonal multiple access and non-orthogonal multiple access are combined according to the specific user number and the channel correlation time condition, and the optimal spectrum efficiency can be obtained under the conditions of different user numbers and correlation time.

The invention relates to a non-uniform beam space modulation method and system suitable for multi-antenna communication perception integration. The method comprises the following steps: solving an ISAC beam which simultaneously satisfies perception performance and communication performance; comprising the steps of constructing a communication transmitting signal; constructing a communication receiving signal; constructing an upper bound of communication sensing integrated spectrum efficiency of non-uniform beam space modulation; constructing a perceptual performance objective function; and solving a candidate beam matrix and beam activation probability distribution which enable the spectrum efficiency to be maximized and the sensing performance to be optimal. And the spectrum efficiency of non-uniform beam spatial modulation is solved through the ISAC beam. Under the condition that the same sensing performance requirement is met, the spectrum efficiency of the method is higher. By modifying the compromise factor between communication and sensing in the system, the beam pattern in the target area direction is closer to the reference beam pattern under the condition of meeting the same communication spectrum efficiency. And the method is superior to the existing beam design method in the aspects of communication and sensing performance.

The invention relates to a central cycle weight generalized space shift keying modulation device, which is characterized in that it comprises: a serial-to-parallel conversion module; an active antenna group mapping module; a center cycle weight space shift keying symbol generation module; and a transmission vector synthesis module. Another technical solution of the present invention is to provide a central cycle weight generalized space shift keying modulation method. The invention has high reliability and good spectrum efficiency, and can flexibly activate any antenna, and is applicable to vehicle-road communication or vehicle-vehicle communication scenarios in the Internet of Vehicles to improve the communication quality of unbalanced links between receiving and transmitting antennas.

The invention provides a frequency spectrum admission control method based on cooperative frequency spectrum sensing. The method comprises the following steps: (1) through a cooperative scheme based on a secondary user group (SUG), self-adapting each secondary user SU to form SUGs; (2) for a cooperative sensing fusion strategy, carrying out calculation on a source node SUsor through a cooperative frequency spectrum sensing scheme so as to obtain an optimal value k under the situation of a given n value; and (3) for an acceptance control threshold of a cognitive radio network, analyzing an optimal acceptance control threshold, which can maximize throughput of the SUGs under the restriction condition of global false alarm probability, through a frequency spectrum acceptance control scheme based on cooperative sensing; and through solving of the optimal acceptance control threshold, finishing the whole optimizing process. According to the invention, the frequency spectrum frequency of the network is very well improved and the throughput of the SUGs can be also effectively increased; and the frequency spectrum acceptance control method based on cooperative frequency spectrum sensing, provided by the invention, is applicable to frequency spectrum access and frequency spectrum switching strategies in the cognitive radio network as well as corresponding performance analysis.

Generalized Rate Division Multiple Access (G‑RSMA) technology has the potential to significantly improve the energy efficiency EE and spectral efficiency SE of wireless networks. In order to maximize the energy efficiency EE and spectral efficiency SE of the multi-cell MISO system, the present invention proposes the joint design of beamforming vector and rate allocation using G-RSMA technology, and establishes the method of simultaneously maximizing the energy efficiency EE and spectral efficiency SE Multi-objective optimization problems. The present invention transforms the proposed multi-objective optimization problem into a single-objective optimization problem to realize the EE-SE trade-off. By further studying the quasi-convex relationship between the energy efficiency EE and the spectral efficiency SE, it can be known that within any reachable spectral efficiency SE region Can get the maximum energy efficiency EE. The simulation results prove that under different system parameter settings, compared with the traditional multiple access technology, the system energy efficiency EE is improved under the ideal spectral efficiency SE.

The invention discloses a digital pre-distortion processing method and device. The method and the device are used for effectively correcting a distortion characteristic of a power amplifier and solving the problem that existing DPD (Digital Pre-Distortion) processing performance is insufficient under a broadband signal. The method comprises the steps of determining a digital pre-distortion model according to an input signal and determining an output signal of the power amplifier according to the digital pre-distortion model, wherein the digital pre-distortion model comprises a conjugate cross term and a nonlinear memory term; and calculating a DPD coefficient according to the output signal.

The present invention relates to the technical field of massive MIMO communication, in particular to a hybrid precoding method based on millimeter wave massive MIMO multi-user scenarios, a method for hybrid precoding using an adaptive connection network in massive MIMO, mainly including analog precoding After the coder is designed and the analog precoder is given, the baseband precoder is solved by MMSE reception. By optimizing the analog precoder to maximize spectral efficiency. At the same time, the method proposed in this application can further reduce the cost and the complexity of the method on the premise of satisfying the performance.

The invention relates to a central circulation weight generalized space shift keying modulation device, which is characterized by comprising a serial-parallel conversion module, a space shift keying modulation module and a central circulation weight generalized space shift keying modulation module, an antenna group activating and mapping module; a central circulation weight space shift keying symbol generation module; and a transmitting vector synthesis module. Another technical scheme of the invention is to provide a central circulation weight generalized space shift keying modulation method.The method has high reliability and good spectrum efficiency, any antenna can be flexibly activated, the method can be suitable for vehicle-road communication or vehicle-vehicle communication scenesin the Internet of Vehicles, and the communication quality of an unbalanced link of a receiving antenna and a transmitting antenna is improved.

The present invention discloses a power allocation method based on fairness and optimal spectrum efficiency, and constructs an optimization problem by setting the constraints of each user's allocated transmission power, the constraints of the attainable data rate, and the constraints of the signal-to-noise ratio Solve the optimal allocated transmission power as the allocated transmission power of each user in the downlink NOMA-RS system. For the specific solution of the optimal allocation of transmission power, the present invention designs an iterative optimization method, which simplifies the solution process and improves the solution efficiency. Adopting the present invention can effectively improve the accessible data rate of the user in the downlink NOMA-RS system, and ensure the fairness of the user data rate, so that the spectrum efficiency of the system can be optimized.

The invention discloses a distributed Alamouti coding cooperative transmission method based on quasi-orthogonal channel allocation, which mainly solves the problem that the traditional method can not simultaneously take the reliability and effectiveness of a system into consideration. In the implementation process of the method, a relay cooperative communication system is set; in a first time slot and a second time slot, a sender S respectively broadcasts signals x1 and x2, and relays R1 and R2 respectively receive signals yr11k, yr21 and yr12, yr22,; in a third time slot, the relays R1 and R2 respectively transmit signals ayr11 and -ay<*>r22 to a receiver D on the same channel, wherein a is an amplification factor, and ()* is complex conjugate; the sender S transmits a signal -x<*>2 to the receiver D on the orthogonal channel with the R1 and the R2; and in a fourth time slot, the relays R1 and R2 respectively transmit signals ayr12 and ay<*>r21 to the receiver D on the same channel, the sender S transmits a signal x<*>1 to the receiver D on the orthogonal channel with the R1 and the R2, and the receiver D carries out maximal likelihood decoding on the received signals. The invention can ensure that the system achieves performance compromising between false symbol rate and spectral efficiency and simultaneously takes the reliability and the effectiveness of the communication system into consideration.

This invention puts forward a receiving and test method for a vertical lamination space time system based on adaptive modulation, which first of all tests channels with the modulation system reaching the maximum saturation, then tests the invalid channels with SN ration can't meet the lowest threshold, finally tests the residual sub-channels according to the principle of the priors with the SN ratio approaching to the threshold value after detection, which can make the tested SN ratio to satisfy the SN-ratio threshed value properly, so, channel resources can be used to the utmost.

The invention relates to a pilot allocation method for a TDD large-scale MIMO system based on an alliance game, and solves the defect that the analysis scene of the pilot allocation method has a large gap with the actual application scene compared with the prior art. The invention includes the following steps: preprocessing of user data; establishment of sub-alliance structure; acquisition of pilot allocation results. The present invention introduces the idea of ​​alliance game into pilot allocation based on user grouping, which is applicable to scenarios where the cell shape is irregular and the number of users in each cell is not fixed (users are randomly distributed), and can effectively reduce pilot pollution. It alleviates the problem that the existing method for solving the effect of pilot pollution is difficult to be practically applied.

The present application provides a method for beam selection and user scheduling of a large-scale planar antenna array in a sea area, which relates to the technical field of sea area scheduling. Step R1, the shipborne AIS system interacts with the shore-based base station equipped with a large-scale antenna planar array to obtain the location information of each user; then obtain the height information of the shore-based base station and the height information of the ship terminal through the altimeter. Step R2, according to the user position information obtained in step R1, the height information of the shore-based base station and the ship terminal, divide the sea area covered by the beam corresponding to the large-scale antenna planar array, and divide each user into each corresponding beam; step R3. Select the user with the highest priority in each beam, and put it into the user set to be served in turn; Step R4. In each scheduling cycle, schedule the users in the user set to be served for service according to the system weight and the maximum rate criterion, Turn off unused beams. In this application, beam selection and user scheduling are fast, and algorithm complexity is low.

The invention discloses a hybrid beam forming method under an imperfect channel state information condition, which comprises the following steps of: (1) for a perfect channel matrix, destroying an original matrix by adding a noise matrix to obtain an imperfect channel matrix; (2) utilizing the principle of an auto-encoder, taking the obtained imperfect channel matrix as input, taking the obtained perfect channel matrix as a label, performing training through back propagation, and constructing a channel feature extraction network; (3) channel coding is carried out through one-time forward propagation of an encoder by using the trained feature extraction network based on the auto-encoder, and a feature matrix of a channel matrix can be obtained through extraction; and (4) inputting the channel characteristic matrix into a network for hybrid beam forming. According to the method, the sparse characteristic of the millimeter wave channel matrix is effectively utilized, channel feature extraction is carried out by utilizing the auto-encoder, and the influence of noise on the hybrid beam forming spectrum efficiency under the condition of imperfect channel state information is solved.

The invention discloses a hybrid precoding method for a millimeter-wave massive MIMO system. The steps include: 1. Channel modeling, determining the channel matrix H, and performing singular value decomposition on the channel matrix to obtain optimal unconstrained full digital precoding Matrix, 2. Construct the simulated precoding vector by alternate iteration method, 3. Update the residual matrix F in a way similar to matching pursuit res , 4. Calculating the digital precoding matrix by the least square method and performing normalization processing. 5. Obtaining the analog combination matrix and the digital combination matrix at the receiving end through the same steps. The present invention can obtain better spectrum efficiency close to the full digital precoding method with relatively low computational complexity, thus can obtain channel capacity close to the full digital precoding method, and greatly save energy consumption of the radio frequency chain.