An Adaptive Millimeter Wave Beam Hierarchical Search Method
A layered search and millimeter wave technology, applied in space transmit diversity, diversity/multi-antenna systems, advanced technologies, etc., can solve the problem of beam search time being difficult to adapt to different communication scenarios, loss of alignment accuracy, and waste of signaling resources and other issues to achieve the effect of ensuring search accuracy, high spectrum efficiency, and saving resources
Active Publication Date: 2022-05-31
HANGZHOU DIANZI UNIV
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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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Embodiment 1
[0125] Step 5. After stopping the scanning of the kth layer, if k
[0127] Step 7. Determine the final beam vector: use equation (14) to obtain the final selected beam vector.
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The invention discloses an adaptive millimeter wave beam layered search method. Steps of the present invention: 1. Beam search scene assumption and multi-layer beam codebook modeling; 2. Beam hierarchical search pilot signal modeling; 3. Adaptive beam layering to any layer, using generalized likelihood ratio test to judge reception Whether the signal-to-noise ratio of the received pilot signal reaches the target value; if the target value is reached or the beam search time of this layer reaches the preset maximum value, the search of this layer will be stopped; otherwise, the search of this layer will continue; 4. The last layer of layered search For any layer other than one layer, after satisfying the single-layer stop search condition in step 3, select the angle space to be searched in the next layer; 5. After the last layer search stops, select the final beam direction. The present invention can automatically adjust beam search time to ensure beam search accuracy when path loss and SNR are unknown: automatically extend search time to ensure search accuracy under low SNR, reduce search time and reduce system overhead under high SNR.
Description
An Adaptive Millimeter-Wave Beam Hierarchical Search Method technical field The invention belongs to the field of information and communication engineering, and proposes an adaptive millimeter wave beam layered search method, It is an adaptive millimeter wave beam search method based on multi-layer beamforming codebook. Background technique [0002] Millimeter wave communication is an important way for mobile communication networks to realize ultra-high-speed communication. However, due to the High propagation loss, mmWave transmit and receive terminals need to be equipped with multi-antenna systems and utilize beamforming technology to enhance the signal directional gain to ensure adequate coverage. In order to obtain high directional gain, the millimeter-wave transmitting and receiving terminals use The beam direction used needs to be precisely aligned with the main path direction of the communication channel, ie beam alignment. Spatial scanning based waves The ...
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IPC IPC(8): H04B7/06H04B7/0456
CPCH04B7/0617H04B7/0482Y02D30/70
Inventor 刘春山李松赵楼
Owner HANGZHOU DIANZI UNIV