The invention discloses a maximizing and speed rate pre-coding method for a simultaneous wireless information and power transfer system. The maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system includes that acquiring all the channel state information through a base station, and building an optimizing model aimed to optimize information users and speed rate. The operation for the iterative optimization of pre-coding matrix includes steps that (1) initializing, to be specific, converting a target function into a convex function through first approximation, wherein at the moment, the information user maximization and speed rate problem is a convex problem under the constraints of sending power and energy user receiving power; setting a sending signal covariance matrix as a zero matrix to solve the problem; (2) iterating, to be specific, substituting the sending signal covariance matrix obtained through solving the optimization problem into the target function, and continuing to solve till realizing information user and speed rate convergence. The theory proves that the maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system is globally optimal in performance, compared with an existing method, the maximizing and speed rate pre-coding method for the simultaneous wireless information and power transfer system converts the problem into the convex problem through gradual convex approximation to solve. By means of the pre-coding method, the information user and speed rate of the simultaneous wireless information and power transfer system can be effectively improved.

Maximizing and speed rate pre-coding method for simultaneous wireless information and power transfer system

The invention discloses two robust beam forming methods for an MISO wiretap channel based on interruption probability constraints. Two robust beam forming schemes for the MISO wiretap channel are provided, a method of bisection, semidefinite relaxation and a Bernstein-type inequality are utilized to transform a nonconvex problem with the interruption probability constraints into a series of semidefinite programming problems in the absence of artificial noise assistance, so that the optimal robust beam forming design is obtained; the total transmitting power is divided into two parts of a useful signal and artificial noise in the presence of artificial noise assistance, through transforming the nonconvex problem with the interruption probability constraints into the semidefinite programming problems, the optimal design of robust beam forming of the useful signal and a covariance matrix of the artificial noise is obtained; the secrecy rate of a communication system is effectively improved, the wiretapping capability of a user is reduced and the security of the communication system is improved.

Two robust beam forming methods for MISO wiretap channel based on interruption probability constraints

The invention discloses an interference eliminating method combining base station and user association, and the method mainly solves the problem that conventional interference elimination technology only solves the freedom degree problem of a system with fixed base station and user association. The method includes the steps of setting a system model, converting a system freedom degree maximization problem into an optimization model and solving the optimization model, determining the optimal base station and user association relation and maximal freedom degree according to the optimization model, and conducting interference elimination at the base station terminal when the base station and user association relation is optimal. The application scope is wide, the maximal possible freedom degree is improved, and interference is effectively eliminated. Association between the base station and users is any multi-cell MIMO multiple-access uplink network.

Interference eliminating method combining base station and user association

The invention discloses a channel estimation error network-based robustness beam forming design method, so that a problem that an uncertainty model can not carry out solving easily when a useful channel and an interference channel coexist can be solved Particularly, the method comprises the following steps: (1), initializing a to-be-designed user beam vector correlation matrix Q1 and constructing an optimization target equation with the highest rate; (2), converting the target equation into step-by-step iteration subproblems; (3), solving each subproblem; (4), carrying out the steps (2) and (3) by a cyclic way until obtaining an optimum correlation matrix Q1; and (5) carrying out decomposition on the optimum Q1 by using a rank one so as to obtain an optimum beam vector v1 According to the invention, self adaption of a channel state error can be realized; and the user rate can be effectively improved The method can be used for the design of transmitting terminal robustness beam forming under the circumstances that the channel estimation error and the interference coexist and for the design of a multi-user multi-input single-output (MISO) system robustness beam under the circumstances that an estimation error exists in a channel state

Channel estimation error network-based robustness beam forming design method

The invention discloses a multi-cell interference alignment algorithm based on interference suppression and capacity improvement and mainly solves the problem that a traditional interference alignment method can not improve the over-all speed of a network greatly The algorithm comprises the specific procedures of 1, initializing a pre-coding matrix V [l] (l=1, , L) of a base station in a cell; 2, establishing an optimization objective with the maximum speed, and obtaining a decoding matrix U [lk] (l=1, , L, k=1, , K); 3, after obtaining the decoding matrix U [lk], obtaining the pre-coding matrix V [l]; 4, repeating the step 2 and the step 3 circularly until convergence or the maximum iterations are achieved By means of the algorithm, the over-all speed of the network can be improved greatly, and the algorithm can be used for the design of a multi-cell interference alignment transmitter-receiver as well as the design of the transmitter-receiver of multiple-input-multiple-output communication system interference alignment

Multi-cell interference alignment algorithm based on interference suppression and capacity improvement

The invention discloses a subspace optimization and Rayleigh quotient-based MIMO (Multiple Input Multiple Output) interference alignment algorithm and mainly solves the problem that a traditional interference alignment method cannot be used for well improving the overall rate of network. A specific process of the subspace optimization and Rayleigh quotient-based MIMO interference alignment algorithm comprises the steps of (1) initializing a pre-coding array V1 (1=1, l, K) of a user transmitting end; (2) constructing an optimal target with a maximum rate; (3) obtaining a decoding matrix Uk (k=1, L, K); (4) obtaining a pre-coding matrix V1 after the decoding matrix Uk is obtained; (5) circulating steps of (3) and (4)till convergence. The subspace optimization and Rayleigh quotient-based MIMO interference alignment algorithm can be used for well improving the overall rate of network and can be applied to design of an interference alignment pre-coding and decoding matrix during simultaneous transmission of multiple users and the design of network pre-codes for reducing mutual interference under the interference network environment with multiple networks.

Subspace optimization and Rayleigh quotient-based MIMO (Multiple Input Multiple Output) interference alignment algorithm

The invention discloses an indoor communication method and device. The method comprises the following steps: constructing a pattern matrix model of an indoor environment; calculating a Fresnel reflection coefficient of the indoor environment; calculating the signal path length of the indoor environment; obtaining a channel model according to the mode matrix model, the Fresnel reflection coefficient and the signal path length; and obtaining the channel capacity according to the channel model. According to the indoor communication method provided by the invention, compared with a traditional MIMO (Multiple Input Multiple Output) method, the indoor communication method has the advantages that the channel capacity is remarkably improved by constructing the mode matrix model and the channel model of the indoor environment, so that the requirement of indoor communication on higher channel capacity is met.

Indoor communication method and device

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Liu Wei

Author Tools

Chat about Author

Papers

Channel estimation error network-based robustness beam forming design method

Multi-cell interference alignment algorithm based on interference suppression and capacity improvement

Subspace optimization and Rayleigh quotient-based MIMO (Multiple Input Multiple Output) interference alignment algorithm

Indoor communication method and device