Signal transmission method and device, computer readable storage medium, base station
A signal transmission and transmission layer technology, applied in the field of communication, can solve the problems of reducing block diagonalization performance, low signal transmission performance, and overall signal-to-noise ratio reduction, etc., so as to improve signal transmission performance, improve signal-to-noise ratio, reduce The effect of complexity
Active Publication Date: 2020-09-01
SPREADTRUM COMM (SHANGHAI) CO LTD
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In this case, the efficiency of the water filling algorithm is reduced, causing the interference to be amplified and the overall signal-to-noise ratio to be reduced, reducing the performance of block diagonalization, and the signal transmission performance is low
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[0028] As mentioned in the background, in the NR system or LTE system, the actual MIMO system has limited modulation and coding rate, and the low or high modulation and coding rate options may not be compatible with the power of the allocated layer, the final signal-to-noise ratio match. Therefore, during downlink adaptation, the number of layers actually allocated may be smaller than the maximum number of layers allocated for the UE. In this case, the efficiency of the water-filling algorithm is reduced, causing the interference to be amplified and the overall signal-to-noise ratio to be reduced, which reduces the performance of block diagonalization and also makes the signal transmission performance low.
[0029] The technical solution of the present invention calculates the effective channel matrix of the user equipment by using the first intermediate matrix of the user equipment, and the first intermediate matrix of the user equipment is based on the first right unitary ma...
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The invention discloses a signal transmission method, a signal transmission device, a computer readable storage medium, and a base station. The signal transmission method comprises the following steps: receiving channel matrixes fed back by all user equipment, and determining the number of transmission layers allocated by respective user equipment in the allocated number of transmission layers; performing singular value decomposition for the channel matrixes of all the user equipment to obtain first unitary right matrixes of all the user equipment; constructing a first intermediate matrix of the user equipment according to the first unitary right matrixes of other user equipment other than the user equipment and the number of transmission layers allocated thereto; calculating an effectivechannel matrix and an effective sub-matrix of the user equipment by using the first intermediate matrix and the first unitary right matrix of the user equipment; performing block diagonalization usingthe effective channel matrix and the effective sub-matrix to obtain a precoding matrix, and modulating a signal transmitted to the user equipment by using the precoding matrix. The technical solutionprovided by the invention can improve the signal transmission performance of the MIMO system.
Description
technical field [0001] The present invention relates to the technical field of communications, and in particular to a signal transmission method and device, a computer-readable storage medium, and a base station. Background technique [0002] Block Diagonalization (Block Diagonalization, BD) is a linear precoding technique in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) system, which can use the null space to avoid multi-user interference . BD decomposes the multi-user MIMO downlink channel into multiple parallel and independent single-user MIMO downlink channels. For channel estimation errors, BD is more robust than nonlinear techniques. The signal of each user transmitted at the transmitter is represented by a modulation matrix, which is the null space of the channel matrix of other users, so that the interference of this user to other users is zero. [0003] In the prior art, in the New Radio (New Radio, NR) system, the downlink MU-MIMO transmission will be be...
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IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456
Inventor 卡尔·兰皮宁塔帕尼·韦斯特曼
Owner SPREADTRUM COMM (SHANGHAI) CO LTD