An Adaptive Switching Beamforming Method for Broadband Trunking Systems

Abstract

The invention discloses a self-adaption switch beam forming method suitable for a broadband clustered system. According to the method, users are clustered, an user average angle or all angles in a cluster are adopted depending on circumstances to calculate a channel matrix, and the channel matrix is simplified, so that calculation to a beam forming vector quantity is conducted, and a beam forming vector quantity calculating method by using iteration is adopted to make up reduction of a received signal to noise ratio. According to the self-adaption switching beam forming method suitable for the broadband clustered system, channel relevancy among clustered users is used, computation complexity of the beam forming vector quantity is lowered, judgment is conducted according to numbers and angles of the users by a base station, a suitable beam forming scheme is adopted, and self-adaption switch to beam forming is achieved.

Description

technical field [0001] The invention belongs to the technical field of broadband trunking systems, and more specifically relates to an adaptive switching beamforming method suitable for broadband trunking systems. Background technique [0002] Multicast beamforming is one of the key technologies of the physical layer in the field of wireless communication. Its principle is to improve user service quality and base station coverage by configuring multiple antennas at the transceiver end for space division multiplexing (SDMA, Space Division Multiple Access) scope. Existing research is mainly based on the criterion of QoS (Quality of Service) or MMF (maximize-minimum-fair, maximizing the minimum receiving signal-to-noise ratio) to solve the shape vector. [0003] figure 1 is a schematic diagram of conventional single-group beamforming. Such as figure 1 As shown, the base station has N transmitting antennas (uniform linear array), and M users in the same group are distributed...

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Problems solved by technology

But unfortunately, regardless of using the QoS criterion or the MMF criterion, the solution process is non-convex, and the method of SDP (Semi-Definite Programming, semi-definite programming) is needed to assist the solution.

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