A 1-bit Feedback Cooperative Beamforming Method Based on Directional Perturbation

Abstract

The invention proposes a 1-bit feedback cooperative beamforming method based on direction disturbance, which belongs to the technical field of communication. This method improves the randomly selected perturbation into a random perturbation with a certain direction. The efficiency of weight perturbation is higher, and the convergence speed is faster. Compared with the existing methods, this method is easier to implement, and requires hardware and energy of the cooperative nodes. lower.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a directional perturbation-based 1-bit feedback cooperative beamforming method. Background technique [0002] Beamforming technology is a multi-antenna transmission technology applied to small-pitch antenna arrays. Its main principle is to use the strong correlation of spatial channels and the principle of wave interference to generate a strong directional radiation pattern, so that the radiation pattern The main lobe is adaptively pointed to the target direction, thereby improving the signal-to-noise ratio, system capacity and coverage. The beamforming technology can be applied to the base station of a cellular cell, and multiple users in a cell (or between multiple cells) are distinguished through space division multiple access, so that they share the same time-frequency resource. For example, 3GPP Long Term Evolution (Long Term Evolution, LTE) supports downl...

AI Technical Summary

Problems solved by technology

However, this method does not make full use of the 1-bit information fed back, and only determines the disturbance of the weight when the target node feeds back 1, resulting in a very slow convergence speed

In 2010, John S.Thompson et al. proposed an improvement to the above method. This improvement focuses on the processing of the feedback 1-bit information. After the improvement, the feedback 1-bit information is fully utilized, that is, when the target node feedbacks 0 and 1, both Confirmation of weight perturbation (S.Song, J.S.thompson, P.J.Chung, and P.M.Grant, "Improving the one-bit feedback algorithm for distributed beamforming," in Proc.IEEE Wireless Communications and Networking Conference, Sydney, Australia, Apr.2010 .), however, the weight perturbation of this method still has no directionality. Although the improved method has a certain improvement in convergence, there is still a lot of room for improvement.

Images