Beam forming method of compact planar array Massive MIMO system

Abstract

The invention discloses a beam forming method for a compact planar array Massive MIMO system. The beam forming method comprises the following steps: constructing a high-frequency sparse channel model on the basis of not considering a mutual coupling effect; performing asymptotic analysis on the high-frequency sparse channel model to obtain an asymptotic equivalence formula of a channel correlation matrix; based on an asymptotic equivalence formula, establishing an optimization model by taking maximization of the minimum receiving SINR values of all users as a target; carrying out equivalent transformation and solving on the optimization model to obtain a beam forming weight vector; based on the beamforming weight vector, performing beamforming processing on the user data, and performing signal transmission. According to the method, an asymptotic equivalence formula of a channel correlation matrix is derived through asymptotic analysis of a high-frequency sparse channel, and on the basis, a beamforming optimization problem is established by taking maximization of a user receiving signal to interference plus noise ratio as a target, so that the robustness of system performance to mutual coupling damage is ensured while the user sum rate is improved.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a beam forming method of a compact planar array Massive MIMO system. Background technique [0002] In terms of signal propagation characteristics and antenna array structure, the high-band Massive MIMO system is different from the traditional low-frequency multi-antenna system: on the one hand, the path loss of high-frequency communication is more significant, the channel is sparser, and the main transmission method is LOS transmission; On the other hand, the traditional ULA architecture is no longer applicable, and a compact planar antenna array is a more suitable deployment method, but the dense deployment of antennas will cause non-negligible mutual coupling damage. [0003] Most beamforming methods in the prior art do not take into account the mutual coupling effect caused by the dense deployment of base station antennas, and are not suitable for high...

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Problems solved by technology

[0002] In terms of signal propagation characteristics and antenna array structure, the high-band Massive MIMO system is different from the traditional low-frequency multi-antenna system: on the one hand, the path loss of high-frequency communication is more significant, the channel is sparser, and the main transmission method is LOS transmission; On the other hand, the traditional ULA architecture is no longer applicable, and a compact planar antenna array is a more suitable deployment method, but the dense deployment of antennas will cause non-negligible mutual coupling damage

[0003] Most beamforming methods in the prior art do not take into account the mutual coupling effect caused by the dense deployment of base station antennas, and are not suitable for high-band Massive MIMO systems that deploy compact planar antenna arrays

However, the existing beamforming design methods that consider the mutual coupling between array elements do not make full use of the asymptotic / steady-state advantages of Massive MIMO technology due to the significant increase in the size of the antenna array, which makes the existing beamforming methods complicated. High accuracy, not suitable for high-band Massive MIMO systems

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