Massive mimo collaborative user scheduling method

A user scheduling, large-scale technology, applied in baseband system components, wireless communications, diversity/multi-antenna systems, etc., can solve problems such as system performance degradation, difficulty in finding optimal solutions, etc. Small system feedback the amount of information, reducing the effect of feedback

Active Publication Date: 2019-04-23
XIDIAN UNIV
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Problems solved by technology

[0003] However, the above-mentioned feedback schemes reduce the amount of uplink feedback by compressing or quantizing the channel state information. Therefore, what the base station receives is no longer perfect channel state information, so the base station is performing user scheduling and pre-registration. It is difficult to find the optimal solution when coding and other work, and finally lead to varying degrees of system performance degradation

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  • Massive mimo collaborative user scheduling method
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Embodiment Construction

[0029] refer to figure 2 , the communication system used in the present invention is composed of a base station, a feedback channel, a transmission channel and a user; wherein, the base station has N t Each antenna is independent of each other; there are M users in the system, assuming that each user has one receiving antenna; the transmitting channel between each transmitting antenna and receiving antenna obeys the complex Gaussian distribution, and the difference between different transmitting channels are independent of each other, the system users are divided into N groups, each user group is independent of each other, the information sent will not interfere with each other, and the sending channel is interfered by additive white Gaussian noise; assuming that the uplink feedback channel is a perfect channel, there will be no time delay and noise.

[0030] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0031] Step 1: The...

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Abstract

The invention discloses a large-scale MIMO cooperative user scheduling method, which mainly solves the problem that the channel state information is compressed or quantized in the prior art, which causes the spectrum efficiency of the system to decrease. The implementation steps are: 1. The base station sends the training sequence to the user, and the user estimates the channel information according to the received signal and the sent training sequence; 2. Groups the users in the system and sets a timer for the user; 3. Through timing The device finds the user with the largest channel norm to broadcast its channel state information to other users in the group; 4. Calculate the correlation coefficient between other users in the group and the user with the largest channel norm, and the user whose correlation coefficient is smaller than the given threshold of the system sends the information to the base station Feedback its channel state information; 5. The base station calculates the sending user set, and sends the sending signal to the user after beamforming. The invention can effectively reduce the amount of system feedback and improve system downlink resources under the premise of less impact on the system and speed.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a user scheduling method, which can be used in a large-scale MIMO system, and can reduce the amount of feedback in the uplink and reduce the computational complexity of the system base station without affecting the performance of the large-scale MIMO system too much. . Background technique [0002] The multi-user scheduling method in the massive MIMO system can effectively improve the system capacity and system stability, and reduce the system bit error rate. In the existing user scheduling technology of the multi-user MIMO system, in order to obtain the optimal system resource allocation scheme, the base station needs users to feed back their user state information to the base station, which means that in the frequency division duplex system, More frequency band resources must be allocated for the uplink feedback link, which will occupy the frequency band resources of the do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04B7/0452H04B7/06H04L25/02
CPCH04B7/0452H04B7/0617H04B7/0626H04W72/121H04L25/0228H04W72/542
Inventor 宫丰奎陈翔张南李栋
Owner XIDIAN UNIV
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