Abstract: The present disclosure provides a channel information feedback method, an apparatus, and a storage medium. The channel information feedback method includes: acquiring channel information; determining a target codeword from a codebook set indicated by the channel information, according to the channel information, where the codebook set includes a plurality of codewords, each codeword of the plurality of codewords consists of one or more codeword blocks; and transmitting an indication parameter of the target codeword.

Abstract: The invention, which relates to a liquid-carrying roller for wet etching and a wet etching method, belongs to the technical field of solar cell manufacturing, and solves the problem of abnormal roller levelness in a process of manufacturing a solar cell in the prior art. The liquid-carrying roller for wet etching of the invention comprises a first end shaft, a second end shaft, and a liquid-carrying shaft, the first end shaft and the second end shaft being located at both ends of the liquid-carrying shaft, respectively, the first end shaft, the second end shaft and the liquid-carrying shaft being arranged concentrically, and the diameters of the first end shaft and the second end shaft being both adjustable.

Abstract: A channel information feedback method, including: performing channel measurement to acquire channel information; determining a target codeword from a codeword set according to the channel information, where at least one codeword element of at least one codeword in the codeword set is determined according to a higher-degree polynomial of an index, and the target codeword is used to characterize the channel information; and feeding back indication information of the target codeword.

Abstract: Methods, systems, and devices for reporting channel state information for antenna arrays in cellular networks. An example method of wireless communication may include determining, by a network node, a mapping between a first channel state information (CSI) parameter and a second CSI parameter, which is followed by transmitting, by the network node to a wireless device, at least one of the first CSI parameter or the second CSI parameter. In this example, the first CSI parameter may include at least one of: a codebook type selection parameter or a positive integer L indicative of a number of vectors associated with a precoding matrix, and the second CSI parameter may include a base vectors group selection parameter.

Abstract: This patent application discloses methods, apparatus, and systems that relate to reference signaling design and configuration. In one example aspect, a method for wireless communication includes receiving, by a wireless device, a measurement reference signal; determining, by the wireless device, a pre-coding matrix based on the received measurement reference signal; and transmitting, by a wireless device, information of the determined pre-coding matrix, wherein the pre-coding matrix is determined based on a first vector of length N1 and a second vector of length N2, wherein the first vector is determined based on a first parameter, wherein the second vector is determined based on a second parameter and the first parameter and the second parameter have relationship.

Abstract: Methods, apparatus, and systems that relate to determination of the precoding matrix are disclosed. In one example aspect, a method for digital communication includes determining, by a first communication node, a precoding matrix that is based on a first vector having N1 elements. An element of the first vector is based on a first product of n and a first parameter, and a second product of n2 and a second parameter. n is an integer that corresponds to an index of the element of the first vector and N1 is a positive integer. The method also includes, by the first communication node, an indicator to a second communication node indicating the precoding matrix. The indicator includes information of at least one of the first parameter or the second parameter.

Abstract: The invention, which relates to a liquid-carrying roller for wet etching and a wet etching method, belongs to the technical field of solar cell manufacturing, and solves the problem of abnormal roller levelness in a process of manufacturing a solar cell in the prior art. The liquid-carrying roller for wet etching of the invention comprises a first end shaft, a second end shaft, and a liquid-carrying shaft, the first end shaft and the second end shaft being located at both ends of the liquid-carrying shaft, respectively, the first end shaft, the second end shaft and the liquid-carrying shaft being arranged concentrically, and the diameters of the first end shaft and the second end shaft being both adjustable.

Abstract: A user privacy data-based recommendation method includes sending a user preference tag to a cloud, where the user preference tag includes a first generalized tag obtained after a first tag generated based on privacy data of a user is generalized, receiving a plurality of resource items found by the cloud from a resource library based on the user preference tag, and selecting a recommended resource item from the plurality of resource items.