Self-adaptive millimeter wave beam layered search method

Abstract

The invention discloses a self-adaptive millimeter wave beam layered search method. The method comprises the following steps: 1, assuming a beam search scene and modeling a multi-layer beam codebook; 2, modeling a beam hierarchical search pilot signal; 3, laying self-adaptive wave beams into any layer, and using a generalized likelihood ratio for checking and judging whether the signal-to-noise ratio of the received pilot signals reaches a target value or not; if the target value is reached or the wave beam search time of the layer reaches a preset maximum value, stopping the search of the layer; otherwise, continuing the layer search; 4, searching any layer except the last layer in a layered manner, and selecting the to-be-searched angle space of the next layer after the single-layer search stopping condition in the step 3 is met; and 5, after the search of the last layer is stopped, selecting a final beam direction. According to the method, the beam search time can be automatically adjusted to ensure the beam search accuracy under the condition that the path loss and the SNR are unknown, the search time is automatically prolonged to ensure the search precision under the condition of low SNR, and the search time is reduced and the system overhead is reduced under the condition of high SNR.

Description

technical field [0001] The invention belongs to the field of information and communication engineering, and proposes an adaptive millimeter wave beam layered search method, which is an adaptive millimeter wave beam search method based on a multi-layer beamforming codebook. Background technique [0002] Millimeter wave communication is an important way for mobile communication networks to achieve ultra-high-speed communication. However, due to the high propagation loss of millimeter waves, millimeter wave transmitting and receiving terminals need to be equipped with a multi-antenna system and use beamforming technology to improve the directional gain of the signal, so as to ensure sufficient coverage. In order to obtain high directional gain, the beam directions used by mmWave transmitting and receiving terminals need to be precisely aligned with the main path direction of the communication channel, that is, beam alignment. The beam search method based on spatial scanning ha...

AI Technical Summary

Problems solved by technology

The problem with this idea is that the fixed beam search time in advance is difficult to adapt to different communication scenarios

If a long pilot sequence is used, it will cause a waste of signaling resources under high SNR

On the contrary, it will cause the loss of alignment accuracy under low signal-to-noise ratio

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