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A method for updating user state information in a large-scale mimo system

A technology for user status and status information, applied in transmission systems, baseband systems, digital transmission systems, etc., can solve the problems of difficult communication protocol scheduling methods, non-negligible time-frequency resource overhead, and short coding length of status information. The effect of simplicity, reduced resource overhead, and low computing power requirements

Active Publication Date: 2021-12-21
ARMY ENG UNIV OF PLA
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  • Application Information

AI Technical Summary

Problems solved by technology

However, most wireless sensors in practical applications have simple structures, and it is often difficult to support scheduling methods with more complex communication protocols.
At the same time, the amount of wireless sensor state information is small, and the code length used for state information is short. The traditional Shannon theory is no longer applicable, and the time-frequency resource overhead caused by estimating channel state information cannot be ignored.
Therefore, the existing state information update methods are limited in application in IoT scenarios

Method used

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  • A method for updating user state information in a large-scale mimo system
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  • A method for updating user state information in a large-scale mimo system

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Embodiment

[0071] Consider a circular cell with a radius of 180m in combination with the 3GPP Release-15 standard, and the base station is located in the center of the cell. The wireless sensor nodes are evenly distributed in the ring area from 50m away from the base station to the edge of the cell. The system bandwidth is 180kHz, the power spectral density of the noise is -174dBm / Hz, the path fading factor α=3.6, and the signal gain on the unit path χ 0 =-60dB, the number of base station antennas M=32, and the number of wireless sensors K=12. All the wireless sensors in the system are of the same type, with the same transmit power, 13dBm. It is worth mentioning that this method is also applicable to the situation where the transmission power of the wireless sensors is different. The amount of information of the target state information sent by the wireless sensor is D=300nats, and the code lengths of the pilot and state information are n respectively p = 50 channeluses and n d = 200...

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Abstract

A method for updating user state information in a massive MIMO system relates to the field of wireless communication. The invention comprises the following steps: S1 wireless sensor sends access request; S2 base station designs data packet structure; S3 broadcasts data packet grouping scheme; S4 wireless sensor sends data packet, base station decodes state information and gives update; S5 continuously updates all user states information. In the present invention, the optimization process of the data packet grouping scheme is placed in the base station with strong computing power, and the wireless sensor only needs to adjust the length of the pilot information and the state information according to the data packet grouping scheme broadcast by the base station, thereby reducing the burden of the wireless sensor; The base station uses the golden section algorithm to iteratively optimize the length of pilot information and status information, and the number of iterations is small. This method is suitable for the Internet of Things with simple structure and low computing power for wireless sensors, but it is not limited to the scope listed above.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for updating user status information in a massive MIMO system. Background technique [0002] The arrival of the Internet of Things era has promoted the development of machine communication and greatly changed people's production and lifestyle. In some IoT applications, base stations or central controllers need to continuously obtain the latest target status information from wireless sensors in order to make decisions or issue instructions. For example: the smart parking lot controller needs to obtain the latest occupancy information of each parking space and push it to nearby drivers; the weather sensor needs to transmit the latest environmental information to the weather station so that the weather station can make scientific and accurate weather forecasts; The mobile robot needs to feed back information such as its own position and speed to the control terminal s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0413H04L1/00H04L29/06H04L25/02H04W8/18
CPCH04B7/0413H04L1/0007H04L69/06H04L69/22H04L25/0224H04L25/0242H04W8/18
Inventor 蔡跃明于宝泉吴丹张余杨炜伟杨文东
Owner ARMY ENG UNIV OF PLA
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