Massive MIMO Downlink Adaptive Transmission Method

Abstract

The invention provides a self-adaptive transmission method of a large-scale MIMO downlink. The self-adaptive transmission method of the large-scale MIMO downlink comprises the following steps: firstly, utilizing a stronger correlation of a large-scale MIMO spatial channel to transform the spatial channel into a beam domain through a DFT transformation; in the beam domain, utilizing a maximum system and rate as a criterion to select uses communicate simultaneously, and assigning an optimal transmission beam for each user, thereby determining a transport layer number and a pre-coding matrix for each user; then, by taking inter-user interferences into consideration, calculating a MMSE balanced posterior signal to interference plus noise ratio on each resource element of each transport layer for each user; and then, acquiring an equivalent signal to interference plus noise ratio for each user by an equivalent signal to noise ratio mapping; finally, on the premise that a word error rate of the transmission is ensured, by each client, to be lower than a given value, determining and feeding back a channel quality indicator of each codon, aiming at maximizing the system throughput. By the self-adaptive transmission method of the large-scale MIMO downlink, the reliability of a large-scale MIMO wireless transmission is increased; and an excellent system spectral efficiency is acquired while the system word error rate is ensured to be lower than the given value.

Description

technical field

[0001] The invention relates to a massive MIMO link adaptive transmission method, in particular to a massive MIMO downlink adaptive transmission method for simultaneous transmission of multiple users. Background technique

[0002] With the rapid development of wireless communication technology, the demand for transmission rate of 5G mobile communication system is much higher than that of 4G mobile communication system, and the traditional MIMO technology can no longer meet the requirements of spectrum efficiency and power efficiency of 5G mobile communication system. The multi-user MIMO wireless transmission technology using large-scale array antennas, that is, massive MIMO wireless transmission technology, provides more space resources to serve multiple users at the same time by setting large-scale array antennas at the base station, and further explores the use of space wireless resource. Massive MIMO wireless transmission system greatly improves the rate ...

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