Virtual MIMO (Multiple Input Multiple Output) relay transmission method and system based on cluster user cooperation

Abstract

The invention discloses virtual MIMO (Multiple Input Multiple Output) relay transmission method and system based on cluster user cooperation. The method comprises the following steps of: dividing a plurality of user terminals adjacent in space into a cluster according to the distribution condition of the user terminals in cells by taking a virtual MIMO transmission technology between each user terminal and a base station, wherein each cell includes a plurality of clusters; modeling a channel between every two user terminals in the cluster to form a Ricean channel; modeling a channel between each user terminal and the base station to form a multipath reyleigh fading channel; and enabling two user terminals in the same cluster to mutually cooperate so as to finish the information transmission from each user terminal to the base station within three time slots. The system comprises the plurality of user terminals and the base station communicated with the plurality of user terminals, wherein clusters formed by the plurality of adjacent user terminals are mutually cooperated to finish the information transmission from each user terminal to the base station within three time slots. The invention remarkably improves the reliability of link transmission of the user terminals in a cellular mobile communication system by sufficiently utilizing the space diversity gain provided by the cooperation of users and also obtains higher utilization ratio of the channel.

Description

technical field [0001] The invention relates to a relay transmission system. In particular, it relates to a virtual MIMO relay transmission method and system based on cluster user cooperation. Background technique [0002] In order to meet users' needs for broadband mobile communications, 3GPP launched the LTE research project in 2004. The uplink of the LTE system adopts the single carrier frequency division multiple access (SC-FDMA) access scheme, and the downlink adopts the OFDMA transmission scheme. After four years of work, 3GPP completed the standardization of the LTE Rel 8 system in December 2008. [0003] In order to further meet the goals determined by the IMT-advanced plan proposed by the International Telecommunication Union ITU, 3GPP launched the LTE-advanced research plan in 2008. The goal of the plan is to enhance the basic LTE system on the basis of the basic specifications determined by LTE Rel 8. And achieve the following goals: system transmission bandwid...

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Problems solved by technology

But at the same time, there are the following disadvantages: due to the extra time-frequency resources occupied by the link between the user terminal and the relay station, the system capacity and spectrum efficiency are greatly reduced; the spatial multiplexing and diversity gain provided by the multi-antenna system cannot be used, making the uplink transmission of the user terminal The capacity and transmission reliability cannot be fully guaranteed; additional relay station equipment needs to be arranged in the existing mobile communication system, which greatly increases the construction cost

[0013] and figure 1 Compared with the given single-antenna relay system based on DFT-S-OFDM, the virtual MIMO relay transmission system based on D-STBC cod

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