Millimeter wave MIMO communication multi-subarray cooperative beam alignment method and millimeter wave MIMO communication multi-subarray cooperative beam alignment device

Abstract

The invention discloses a millimeter wave MIMO communication multi-subarray cooperative beam alignment method and a millimeter wave MIMO communication multi-subarray cooperative beam alignment device. The method comprises the following steps: (1) a receiving end and a sending end analyze a code book corresponding to each subarray and perform space division accordingly, each subarray extracts code words from own code book to form a corresponding subcode book, and a union set of the subcode books formed by extraction can cover the original space; (2) based on the extracted subcode books, the sending end uses a plurality of beam sending signals, and for a sending combination of the sending end, the receiving end simultaneously uses a plurality of beam receiving signals based on the extracted subcode books; (3) by making use of information acquired in a phase of training, a principal direction of channels is calculated, and high-efficiency and low-complexity beam selection is realized further. In the method and the device provided by the invention, by taking full use of a character that a millimeter wave channel has sparsity, a corresponding multi-subarray cooperative training framework and an effective algorithm are provided. Analysis and a simulation experiment both show that the method provided by the invention not only reduces training overhead and calculation complexity greatly, but also has very small corresponding performance loss in comparison with an exhaustive search algorithm.

Description

Technical field [0001] The present invention relates to beam alignment technology in millimeter wave MIMO, and considers how multiple sub-arrays at the transceiver end can cooperate to quickly complete training, and accordingly realize beam alignment efficiently, belonging to the field of wireless communication technology. Background technique [0002] Since the millimeter wave communication system has a large bandwidth and can provide a data transmission rate of several G-bps, it has a very broad application prospect. However, compared with microwave communication systems, millimeter wave communication system design and implementation also have many problems. On the one hand, the frequency of the millimeter wave signal is high and the wavelength is short, and the signal attenuation is very serious, so the communication distance and coverage are very limited; on the other hand, because the signal wavelength is short, it is possible to arrange more antennas in a smaller area. The...

AI Technical Summary

Problems solved by technology

Due to the characteristics of millimeter-wave signal transmission, the signal-to-noise ratio is often very low before obtaining array gain, and the introduction of multi-subarray technology at the transceiver end makes this problem more difficult, mainly in two aspects: (1) Since multiple sub-arrays are configured at the transceiver end, the training overhead required for multi-sub-array beam alignment is very large

(2) Due to the large amount of data obtained during the training process, how to process the obtained information and complete the final beam alignment task requires a high computational complexity

Since most of the current research focuses on the processing after obtaining the training data, and does not consider how to reduce the training overhead, the corresponding algorithms have high complexity.

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