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MIMO mode switching scheme for distributed space-time coding and traditional space-time coding

A technology of space-time coding and mode switching, applied in diversity/multi-antenna systems, spatial transmit diversity and other directions, can solve the problems of distributed MIMO and traditional MIMO switching problems that are not studied in literature, and achieve the effect of high transmission rate

Inactive Publication Date: 2014-12-24
PEKING UNIV
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Problems solved by technology

[0008] At present, there is basically no literature on the switching between distributed MIMO and traditional MIMO.

Method used

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  • MIMO mode switching scheme for distributed space-time coding and traditional space-time coding
  • MIMO mode switching scheme for distributed space-time coding and traditional space-time coding
  • MIMO mode switching scheme for distributed space-time coding and traditional space-time coding

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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below. The present invention designs a switching scheme between DSTBC and STBC, adopts the principle of maximizing transmission capacity, and selects the MIMO mode that can enable UE to obtain greater transmission capacity. When using the traditional STBC transmission mode, the eNB side uses two antennas to perform Alamouti space-time coding and directly transmits the signal to the UE; The two nearest relays perform data forwarding, and the two single antennas of the two relays are combined into a virtual antenna matrix for distributed Alamouti space-time coding to forward the data to the UE. The distance between the UE and the two relays and the distance between the UE and the eNB are called three-dimensional distances. The handover measurement between DSTBC and STBC is related to the three-dimensional distance and the signal-to-noise ratio (SNR) of the signal received by the UE. The specific i...

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Abstract

The invention discloses an MIMO mode switching scheme for distributed space-time coding and traditional space-time coding. The MIMO mode switching scheme mainly comprises the steps that UE receives and measures the signal to noise ratio SNR of a receiving end in a current transmission mode, the distance between the UE and a cooperative relay, and the distance between the UE and a base station eNB, wherein the distance between the UE and the cooperative relay, and the distance between the UE and the base station eNB are called as the three-dimensional distance; the measured SNR and the three-dimensional distance are fed back to the eNB; according to the feedback three-dimensional distance, the eNB looks up a table and obtains the SNR threshold value range of the switching between the DSTBC and the traditional STBC corresponding to the distance; whether the feedback SNR is within the SNR threshold value range of the switching or not is judged; if the feedback SNR is within the SNR threshold value range of the switching, the mode is switched, and if not, data transmission is carried out in the current MIMO mode.

Description

technical field [0001] The invention relates to a MIMO mode switching method applied to a cellular system with relay cooperation, and aims to provide a switching scheme between distributed space-time coding and traditional space-time coding, so as to further improve the transmission rate of users. Background technique [0002] MIMO technology is a multi-antenna technology applied to wireless communication to improve user transmission quality. At present, MIMO transmission modes are mainly divided into three categories: space diversity, space multiplexing, and wave velocity shaping. Among them, the space diversity and wave velocity shaping technologies are mainly used in scenarios where the channel space correlation is high and the link quality is poor, and the diversity gain of the space link and the way of reducing link interference are used to improve the quality of the user's communication link. Ensure transmission reliability. The spatial multiplexing technology is use...

Claims

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Application Information

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IPC IPC(8): H04B7/04
Inventor 程翔沈霞焦秉立
Owner PEKING UNIV
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