7 results about "Mimo transmission" patented technology

【Solution means】The embodiments of this application disclose a method and apparatus for determining an uplink MIMO transmission codeword applicable to a communication system. The method includes the steps of determining candidate codewords for 4Tx and / or 2Tx of uplink MIMO transmission, where the candidate codewords include at least one of a first candidate codeword for antenna full coherent transmission, a second candidate codeword for antenna partial coherent transmission, and a third candidate codeword for antenna non-coherent transmission, and determining a first codeword for antenna partial coherent transmission and / or a second codeword for non-coherent transmission of 8Tx L layers of the uplink MIMO transmission based on the candidate codewords. In the embodiments of this application, based on low-dimensional transmission codewords, high-dimensional 8Tx antenna partial coherent transmission codewords or non-coherent transmission codewords can be constructed, so that uplink MIMO can support transmission requirements from 1 layer to 8 layers of 8Tx, and the uplink MIMO technology can be further enhanced.

Techniques and apparatuses are described for multiple-input multiple-output transmissions using adaptive phase-changing devices. In aspects, a base station selects one or more adaptive phase-changing devices, APDs, to use in at least one communication path for multiple-input, multiple-output, MIMO, transmissions. The base station can perform a channel characterization process for the at least one communication path using the at least one APD and at least one UE. Based on results of the channel characterization process, the base station configures the at least one APD by which to implement single user-MIMO communication with a UE or multiple user-MIMO communication with multiple UEs. By so doing, the base station may implement MIMO transmissions using APDs to communicate with the at least one UE using same time and frequency resources, which can improve spectral efficiency of a wireless network.

A method is disclosed for reduction of peak-to-average power ratio (PAPR) of transmission of a multiple-input multiple-output (MIMO) signal from a transmitter, wherein the transmission comprises a number of MIMO layers. The method comprises determining a clipping signal for the MIMO signal, and generating a PAPR reduced MIMO signal for transmission by combining the MIMO signal with a projection of the clipping signal onto a null space of an effective channel. The effective channel comprises a propagation channel between the transmitter and one or more receivers (wherein the receivers have an amount of receiver antenna ports) as affected by receiver combining matching transmitter precoding. A setting of the transmitter precoding is varied over frequency, which induces frequency selectivity of the effective channel. The method is particularly useful when the propagation channel is relatively flat in frequency. Corresponding computer program product, apparatus, radio access node, user device, control node, and system are also disclosed.

This application discloses a file annotation method, apparatus, device, and medium based on PDFJS and MIMO, relating to the field of computer technology. The method includes: rendering the original PDF file onto a first canvas layer using the PDF.js library and creating a second canvas layer; monitoring client annotation operations on the second canvas layer to generate corresponding annotation operation data packets, and uploading these data packets to a preset server via a preset network channel based on a preset MIMO transmission strategy, so that the preset server associates and stores the annotation data packets with the unique identifier of the original PDF file; if a loading request for the original PDF file is received, the annotation description file is obtained using the unique identifier, and the annotation data within it is drawn onto the second canvas layer to reconstruct the annotations. This enables precise mapping of annotation coordinates, improves the efficiency of multi-channel real-time collaboration, and enhances the storage and management capabilities of annotation data in a Web environment.

Embodiments of the present application provide a method and device for encoding and decoding. The method comprises: obtaining a first code block (CB) and a second CB, wherein the first CB and the second CB are encoded using the same scheme, the first CB and the second CB correspond to different MIMO antennas respectively, the first CB comprises m information bits, and the m information bits are mapped to the second CB; and transmitting the first CB and the second CB. According to the present application, the technology of using related bits between multiple CBs in a transmission block is applied to a MIMO transmission system, wherein the multiple CBs are from different MIMO antennas respectively, which helps to improve the accuracy of CB transmission in the MIMO transmission system and reduce the word error rate (WER) of the CB.