Sky wave large-scale mimo communication downlink transmission method

Abstract

The invention discloses a downlink transmission method for sky-wave massive MIMO communication, which comprises: the sky-wave massive MIMO communication uses a beam-based channel statistical model, which is expressed as the product of a beam matrix and a beam domain channel vector; at the base station side, the beam domain channel is used Statistical information and its sparse characteristics, generate each user’s non-zero beam index set and multi-user non-zero beam index set, obtain the dimension-reduced beam-domain channel, dimension-reduced beam-domain statistical channel information and dimension-reduced beam matrix of each user; On the side, the optimal design or asymptotically optimal design of the user downlink precoding matrix is ​​performed in the dimensionality reduction beam domain, and then the user downlink transmission signal is generated by precoding by using the obtained user downlink precoding matrix. The present invention can significantly improve the spectrum efficiency of sky-wave communication in a high-speed mobile scene, thereby greatly improving the transmission rate and transmission distance, and at the same time solves the problem of complex design of the large-dimensional downlink precoding matrix involved.

Description

technical field [0001] The invention relates to the field of sky wave communication, in particular to a downlink transmission method of sky wave massive MIMO communication. Background technique [0002] Skywave communication, which often operates in the short-wave band with a carrier frequency of 1.6-30MHz, can realize long-distance signal transmission through ionospheric reflection and does not require expensive ground infrastructure. Traditional sky wave communication systems often rely on a single-input single-output system architecture and have very low system capacity. Massive MIMO technology can serve a large number of users on the same time-frequency resource by configuring an array of a large number of antennas on the base station side. It is an important potential enabling technology for future Skywave broadband communications. [0003] Generally speaking, the accuracy of the user downlink channel state information available at the base station side has a considera...

AI Technical Summary

Problems solved by technology

In the existing literature, the covariance matrix design of downlink transmission signals based on statistical channel information often uses the channel model established by discrete Fourier transform, and does not fully consider the angular domain sparse characteristics of massive MIMO channels

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