Data transmission method of mu-mimo network based on csi accuracy, effectiveness and stability

Abstract

The invention discloses a data transmission method in an MU-MIMO (Multi-user Multiple Input Multiple Output) network based on a CSI (Channel State Information) accuracy, an effectiveness and a stability. The method comprises the following steps: performing accuracy assessment on a CSI value H between a user and an AP (Access Point) end by utilizing an AP end bit error rate maximum likelihood estimation algorithm based on a constellation map distribution distance; calculating signal noise ratio varying (SNRV) of instantaneous CSI values (as shown in the specification) by the AP end utilizing aCSI stability quantization statistical algorithm based on the signal noise ratio varying; performing analyzing on channel state influence factors for the instantaneous CSI values (as shown in the specification) by the AP end utilizing an AP end device state monitoring algorithm based on a PDP similarity, a ToF estimation and a standing wave field speed measurement; determining a maximum service duration of a current user according to a CSI coherence time of the current user by the AP end utilizing a maximum timeslice service algorithm based on a coherence duration; and redistributing transmission power by the AP end utilizing a CSI correction algorithm based on a downlink beam forming technology. According to the data transmission method in the MU-MIMO network based on the CSI accuracy, the effectiveness and the stability, data transmission in the MU-MIMO wireless network can be performed based on the CSI accuracy, the effectiveness and the stability.

Description

Technical field[0001]The invention belongs to the field of wireless communication network security, and relates to a MU-MIMO network data transmission method based on CSI accuracy, effectiveness and stability.Background technique[0002]The latest standard 802.11ac protocol introduces Multi-user Multiple Input Multiple Output (MU-MIMO) technology to improve the channel performance of wireless networks. In the MU-MIMO system, the receiver (Receiver) receives mixed signals sent from multiple transmitters (Transmitter). In order to decode each user's data without interference, it needs to use Channel State Information (Channel State Information, CSI). CSI is a comprehensive measure of energy attenuation and phase delay generated by different path signals, reflecting the differences between different channels. When concurrently communicating with multiple users in the same frequency band at the same time, the wireless access point (AccessPoint, AP) can perform accurate mixed data precodin...

AI Technical Summary

Problems solved by technology

But unfortunately, both of them only take partial improvement measures for specific problems, and have never made comprehensive and systematic predictions on channel accuracy, effectiveness and stability, let alone making reasonable and long-term data Transmission planning, which is difficult to be widely used effectively under complex data transmission conditions

[0004] If the accuracy, effectiveness, and stability of CSI are not pre-evaluated before data transmission, the throughput rate, bit error rate, and even channel validity of the entire data transmission process cannot be guaranteed.

First of all, when the background noise of the channel is always large and cannot be eliminated, that is, when the channel SNR (Signal Noise Ratio, SNR) is very low, the cost of data transmission will be greatly increased, and frequent requests for data retransmission or recovery are extremely important. Unwise, and blindly reducing the CSI feedback overhead will not help, and will even further reduce the already unbearable SNR

Secondly, when the device is in a large motion state, the real-time CSI value will change significantly, and the channel SNR will also change accordingly, resulting in a significant shortening of the CSI validity period (ie, coherent time, Coherent Time). At this time, the expired CSI is used to re- Data transfer is definitely not realistic

Furthermore, when there is strong interference in the environment around the device, such as signal interference and multipath effects caused by the movement of other devices or other objects, the CSI of the current channel will fluctuate severely, making data transmission including data recovery and retransmission difficult. blocked

Finally, once the CSI of the channel is invalid and cannot be effectively improved by certain measures in the short term, under the current MU-MIMO wireless network, the device no longer has the ability to transmit data, and any other forms of CSI feedback compression and channel adaptation Correction and data recovery or retransmission will be pointless

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