The invention discloses a large-scale MIMO (multi-input multi-output) system precoding implementation method based on LDLT decomposition, which is used for solving the problems of high bit error rate, high calculation complexity and high resource occupation of a system in the prior art. A base station obtains a downlink original channel matrix H by time division duplex reciprocity or feedback information of each user, and according to the obtained channel matrix H, a precoding matrix W is obtained by applying a method based on a MMSE criterion. In order to reduce calculation complexity and improve a data processing speed, the invention adopts a method which combines an operation of carrying out segmented parallel calculation on a multi-dimension matrix with an operation of carrying out LDLT decomposition on the precoding matrix. In the matrix operation process, in order to simplify calculation, according to specificity of matrix and vector calculation, the invention adopts a calculation implementation mode from back to front. Compared with a conventional precoding method, the large-scale MIMO system precoding implementation method can better reduce algorithm complexity of the system and improve timeliness of the system, reduces system cost and a structure of a receiver, eliminates multi-user interference and ensures system performance.

Large-scale MIMO (multi-input multi-output) system precoding implementation method based on LDLT decomposition

The invention provides a reciprocity calibration method and a reciprocity calibration device applied to a time division duplex mode MIMO cooperative network The reciprocity calibration can be carriedout in a decentralized manner through cooperation among base stations in a macro cell, and the decentralized calibration can reduce the overhead of a return link compared with the traditional centralized calibration method The invention also discloses a reciprocity calibration method and a reciprocity calibration device for a time division duplex mode MIMO cooperative network Joint calibrationbetween base stations allows MIMO networks to exhibit performance without being affected by reciprocity mismatch

Decentralized reciprocity calibration method and apparatus

A method for estimating transmitted signals transmitted from a plurality of transmitters, the method comprising: simultaneously receiving at each of a plurality of receivers a respective received signal resulting from the transmitted signals; determining for each receiver a set of equation coefficients; forming for each received signal a characterisation of that received signal composed of elements weighted in accordance with the equation coefficients determined for the receiver at which that received signal was received; and processing the characterisations to estimate the transmitted signals; wherein the equation coefficients are determined such that the characterisations are substantially linearly independent.

Aggregating received data

The invention relates to a user assist time division duplex multiple-input-multiple-output three-base-station channel calibration method, and belongs to the technical field of wireless communication multiple-input-multiple-output system channel calibration. The method comprises the steps: one antenna is arbitrarily selected from multiple antennas in each base station, up and down channel state information of the reference antenna and other antennas of the base station is acquired, and channel calibration factors of the reference antenna and other antennas of the base station can be obtained according to the acquired information; under a condition of known user large scale fading, calibration assist user is selected to obtain channel calibration factors between three reference antennas of three base stations; channel calibration factors between all antennas of the three-base-station system are estimated according to the above obtained factors. According to the invention, the method introduces calibration assist user, CSI accuracy can be improved, channel calibration precision can be further improved, and complexity of channel calibration can be reduced.

User assist time division duplex multiple-input-multiple-output three-base-station channel calibration method

The invention relates to a time division duplexing multiple-input multiple-output seven-base-station channel calibration method with user assistance, and belongs to the technical field of radio communication multiple-input multiple-output system channel calibration. The method comprises the following steps: randomly selecting one antenna as a reference antenna from multiple antennas of each base station, obtaining uplink and downlink channel state information (CSI) of the reference antenna and other antennas of the base station, and according to the obtained uplink and downlink CSI, obtaining channel calibration coefficients of the reference antenna and other antennas of the base station; under the condition that a large-scale fading of a user is known, selecting an auxiliary calibration user to obtain channel calibration coefficients between seven reference antennas of seven base stations; and according to the obtained channel calibration coefficients of the reference antenna and other antennas of the base station and the channel calibration coefficients between the seven reference antennas, estimating the channel calibration coefficients between all antennas of a seven-base-station system. According to the invention, through introduction of the auxiliary calibration user, the accuracy of the CSI can be improved, the channel calibration precision is improved accordingly, and the complexity of channel calibration is reduced.

Time division duplexing multiple-input multiple-output seven-base-station channel calibration method with user assistance

The invention relates to a relay channel calibration method based on overlapping forwarding in a time division duplex multi-antenna system, and belongs to the field of wireless communication relay channel calibration. The method comprises the steps that an uplink pilot frequency sequence is sent to a relay, a base station receives a pilot frequency sent by the relay and estimates the channel state information, the base station transmits a downlink pilot frequency, the relay receives a downlink pilot frequency signal sent by the base station, estimates the downlink channel state information and carries out overlapping, amplifying and forwarding on the received signal, the base station receives the signal which is amplified and forwarded by the relay, the channel state information in the whole uplink and downlink process is estimate, the downlink channel state information is estimated according to the uplink channel state information estimated previously, and channels are calibrated according to the relation of the uplink channel state information and the downlink state information. According to the method, the uplink channel and the downlink channel of the TDD-MIMO system can be accurately calibrated, and the downlink channel information can be concisely obtained through the reciprocity principle.

Relay channel calibration method based on overlapping forwarding in time division duplex multi-antenna system

Popular Tasks used by Researchers

How can I help with your research?

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

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

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

Anyone with the link can view this chat. You can switch it back to private anytime.

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.

Su Xin

Author Tools

Chat about Author

Papers

Relay channel calibration method based on overlapping forwarding in time division duplex multi-antenna system