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A communication method for multiple input multiple output system

A communication method and multi-output technology, which is applied in the communication field of a multi-input multi-output system, can solve problems such as CQI mismatch, data transmission failure, system performance deterioration, etc., to solve CQI mismatch, small amount of calculation, and complexity low effect

Active Publication Date: 2020-04-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this scheme estimates the achievable rate of MU communication based on rank1-CQI / PMI, and the actual achievable rate is often inconsistent with the estimated achievable rate, which leads to the problem of CQI mismatch and the failure of data transmission, which requires retransmission, making the system poor performance
Therefore, the above-mentioned technology based on codebook precoding and mature codebook generation technology inevitably have disadvantages such as low MU-MIMO pairing probability, severe CQI mismatch, and large amount of uplink feedback.

Method used

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  • A communication method for multiple input multiple output system
  • A communication method for multiple input multiple output system
  • A communication method for multiple input multiple output system

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0047] figure 2 and image 3 In the case of self-adaptation, when the number of UEs to be scheduled is 2 and 20, the throughput performance of this scheme is compared with that of the conventional Rank-1 scheme.

[0048] Depend on figure 2 It is not difficult to find that when the number of transmitting antennas is 4, the number of receiving antennas is 2, and the number of users to be scheduled is 2, in the case of adaptive CQI, the throughput performance of this scheme has a considerable improvement. Under the premise of achieving the same throughput performance, this scheme has lower requirements for signal-to-noise ratio. As the throughput increases, this advantage gradually expands; in terms of throughput performance improvement, the performance of this scheme is compared with that of the Rank-1 scheme. The comparison of the curves shows that the D2D...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a communication method for a multiple-input-multiple-output system. According to the method provided by the invention, each UE estimates channel matrix CSI information according to CSI-RS information received from a base station, calculates a channel capacity value and a codebook index according to local codebook information and the CSI information, and then broadcasts the channel capacity value and the codebook index through a D2D link. Each UE determines a pairing combination on the local UE according to received broadcasting information of other UE, then the paired UE calculates an SINR (being mapped into a CQI) of data flow of a present user in the case of no CQI mismatch, and feeds back the SINR and necessary information to the base station. Therefore, for the communication method provided by the present invention, only the paired UE feeds back the information to the base station at the UE, and the base station performs centralized scheduling according to the information reported by the paired UE.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a communication method for a multiple-input multiple-output system. Background technique [0002] Multiple Input Multiple Output (MIMO) technology, as one of the key technologies in the future wireless communication field, greatly improves link reliability and system spectrum efficiency (Spectrum Efficient, SE). In the traditional MU-MIMO (multi-user multiple input multiple output technology) precoding scheduling scheme based on rank1 feedback, each UE needs to feed back a maximum rank1-CQI / PMI (channel quality indicator / precoding matrix instruct). Then, the base station estimates the interfering CQI according to the UE feedback information predict Thus, the achievable rate of MU communication with other users can be estimated. Finally, according to the CQI predict Calculate the maximum MU communication reachable rate and calculate the maximum SU communication re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456H04B7/0482
Inventor 方舒曾裕韩元超张砚秋郑凯立王勇芦滨雁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA