Channel estimation method of hybrid quantization system based on deep neural network

Abstract

The invention discloses a channel estimation method of a hybrid quantization system based on a deep neural network. The method comprises the following steps: firstly, dividing a base station antenna into a high-precision ADC antenna set and a low-precision ADC antenna set, and generating a real channel and a received and quantized pilot signal as training data according to a system transmission model and a channel model in a simulation environment; then, sending training data to the designed deep neural network 1 and the designed deep neural network 2 for offline training, and ending the training by adjusting a neural network weight matrix until the performance is converged; and finally, assembling the trained neural networks 1 and 2 at a base station end, wherein the trained neural networks 1 and 2 are respectively used for estimating channels corresponding to the high-precision ADC antenna and the low-precision ADC antenna. According to the estimation method, the powerful learning capability of the deep neural network is fully utilized; through offline training based on a large amount of data, the deep neural network can explore spatial correlation between different antennas in alarge-scale antenna system, so that accurate mapping from a high-precision ADC antenna corresponding channel to a low-precision ADC antenna corresponding channel is realized.

Description

technical field [0001] The invention relates to a channel estimation method of a hybrid quantization system based on a deep neural network, belonging to the technical field of wireless communication. Background technique [0002] The large-scale antenna system configures an antenna array with tens or even hundreds of antennas at the base station, and the base station uses a large-scale antenna array to communicate with multiple users simultaneously on the same time-frequency resource. Utilize the spatial freedom provided by the large-scale antenna array of the base station to improve the multiplexing capability of spectrum resources between multiple users, the spectrum efficiency of each user, and the ability to resist inter-cell interference, thereby greatly improving the overall utilization of spectrum resources. At the same time, the overall power efficiency is further improved by utilizing the array gain provided by the large-scale antenna array. Compared with tradition...

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Problems solved by technology

However, the optimization results based on this approximate model cannot achieve better performance in the actual quantization process, which makes the traditional method suffer from great limitations.

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