Downlink multi-user method combined with receiving antenna selection and close-to zero beam forming

Abstract

A downlink multi-user multiplexing method integrating with receiving antenna selection and zero-approach bean formation (ZABF) includes setting number of radio frequency component at user end to be less than number of receiving antenna, operating greedy selection algorithm on user channel matrix by user end, selecting line with matrix second-order norm (MSON) from said matrix, projecting the rest lines and selecting projection line with MSON, repeating selection steps till number of radio component selected by user is equal to number of antenna subset, activating channel state information of all users to receive selection of antenna subset and ZABF.

Description

Technical field: [0001] The invention belongs to the technical field of mobile communication single-cell multi-antenna downlink channel capacity, and in particular relates to a downlink multi-user multiplexing method in which a base station performs scheduling and preprocessing according to channel state information in a multi-antenna downlink channel. Background technique: [0002] Multi-user diversity is an effective method to improve the spectrum efficiency of a wireless system that has been extensively studied in the field of mobile communication single-cell multi-antenna downlink channel capacity technology. [0003] "International Institute of Electronics and Electrical Engineers International Communication Conference Proceedings" (IEEE Internet.Conf.Communication ICC'05, Rio de Janeiro, Brazil, July 9-18, 2005, pp.542-546) introduces an Multi-antenna, single-antenna single-cell multi-antenna downlink channel based on zero-forcing beamforming technology downlink multi-...

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Problems solved by technology

[0003] "International Institute of Electronics and Electrical Engineers International Communication Conference Proceedings" (IEEE Internet.Conf.Communication ICC'05, Rio de Janeiro, Brazil, July 9-18, 2005, pp.542-546) introduces an Multi-antenna, single-antenna single-cell multi-antenna downlink channel based on zero-forcing beamforming technology downlink multi-user multiplexing method, this method uses quasi-orthogonal user channel selection method to select users, when the number of users in the system is small When , it is not easy to obtain multi-user diversity, so that the throughput that can be achieved is greatly limited

[0004] "IEEE JSAC Special Issue on 4GWireless Systems IEEE" introduced a single-cell downlink channel based on zero-forcing beamforming technology to utilize user The downlink multi-user multiplexing method of obtaining antenna selection diversity by using multiple antennas at the terminal, but this method needs to assemble expensive radio frequency devices equal to the number of receiving antennas at the user terminal, which greatly increases the implementation cost of the user terminal, and the base station requires The complexity of the channel state information and user selection algorithm of the downlink channel increases exponentially with the number of receiving antennas at the user end

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