Method and device for selecting two-level codebook and rank, and computer-readable storage medium

Abstract

The application discloses a method and device for selecting a two-level codebook and rank, and a computer-readable storage medium, including dividing the first-level codebook index and the second-level codebook index of each layer into several groups according to the grouping strategy; Layer randomly selects a secondary codebook index, respectively calculates the channel capacity corresponding to the precoding matrix composed of a randomly selected primary codebook index and the selected secondary codebook index for each group, and selects the primary channel capacity corresponding to the maximum channel capacity Codebook index and calculate the channel capacity corresponding to the first-level codebook index of the group it belongs to and the selected second-level codebook index, and select the first-level codebook index corresponding to the maximum channel capacity of each layer as the optimal first-level codebook index for this layer Codebook index; calculate the optimal secondary codebook index of the layer in the same way; select the rank, primary / secondary codebook index. The invention greatly reduces the computational complexity of RI and PMI selection when two-level codebooks are used.

Description

technical field [0001] The present invention relates to but not limited to the technical field of wireless communication, and in particular relates to a method and device for selecting a two-level codebook and rank, and a computer-readable storage medium. Background technique [0002] Long Term Evolution (LTE) and Long Term Evolution Advanced (LTE-A) systems use a precoding codebook-based closed-loop spatial multiplexing technology to improve system performance. The closed-loop spatial multiplexing technology requires accurate acquisition of channel state information (CSI) at the transmitting end, and selection of an appropriate number of layers and precoding to preprocess the transmitted signal based on the channel state information. Channel state information needs to be fed back to the transmitting end through the user equipment (User Equipment, UE) at the receiving end, such information includes the rank indicator (Rank Indicator) of the channel matrix, the precoding code...

AI Technical Summary

Problems solved by technology

From the above analysis, it can be seen that both of these two patents adopt the method of simplifying the PMI search, but they mainly use different optimal criteria for the first-level and second-level codebooks, and simplify the criteria, but still need to traverse the PMI , its searches did not decrease

[0005] In addition, in the application with the publication number "CN103546209B" and the title of the invention "A method for selecting an eight-antenna codebook in an LTE-A system", the two-level codebook search is separated for the layer 1 codebook and the layer 2 codebook , first traverse the 16 codewords of the primary codebook codeword W1 to determine the primary codebook index PMI1, and then traverse the 16 codewords of the secondary codebook codeword W2 according to the determined PMI1 to determine the secondary codebook index PMI2 , this patent reduces the number of PMI searches to PMI1+PMI2 times, which has a certain effect of reducing complexity, but still requires a large number of searches, and does not provide a simplified method for codebooks with more than 2 layers, and this patent is for Different criteria are used to search for PMI1 and PMI2, which increases the complexity of hardware implementation

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