Downlink non-orthogonal multi-access method based on spatial modulation for multi-antenna system

Abstract

The invention discloses a downlink non-orthogonal multi-access method based on spatial modulation for a multi-antenna system. Firstly, users obtain channel state information of a downlink through channel estimation, and transmit partial channel state information to a base station through a feedback link; secondly, the base station divides Nt transmitting antennas into K groups according to the obtained channel state information, wherein the ith group includes Ni antennas; simultaneously, the base station divides the users into K clusters; each cluster includes two users; furthermore, a set of transmitting antennas is distributed to each user cluster; then, the base station respectively performs spatial modulation of K clusters of users; furthermore, spatial modulation signals are transmitted after spatial beam forming; and, the various users demodulate own signals by adopting the maximum likelihood detection method at a receiving end. By means of the downlink non-orthogonal multi-access method based on the spatial modulation for the multi-antenna system disclosed by the invention, a simple and effective non-orthogonal multi-access method is provided for a future broadband wireless communication system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a downlink non-orthogonal multiple access method based on a space modulation multi-antenna system. Background technique [0002] Non-orthogonal multiple access (NOMA) technology has attracted widespread attention from academia and industry due to its extremely high spectrum utilization efficiency, and is considered to be a key technology in the fifth generation mobile communication system (5G). In traditional orthogonal multiple access technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA) and code division multiple access (CDMA), a radio resource block can only be allocated For a mobile terminal, resulting in extremely low resource utilization efficiency. The non-orthogonal multiple access technology makes use of the difference in the power domain to enable multiple users to work at the same frequency at the same time using th...

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Problems solved by technology

[0004] In order to solve the problems of high reception complexity and difficult guarantee of user fairness in the above solutions, the present invention proposes a downlink non-orthogonal multiple access method based on a spatial modulation multi-antenna system

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