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

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.

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 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.