Large-scale MIMO collaborative user scheduling method

A user scheduling and large-scale technology, applied in the field of wireless communication, can solve problems such as difficulty in finding an optimal solution and system performance degradation, and achieve the effects of reducing the amount of system feedback information, improving spectrum efficiency, and reducing the number of users

Active Publication Date: 2016-10-12
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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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 collaborative user scheduling method for mainly solving the problem that in the prior art a spectrum efficiency of a system is reduced as state information of a channel is compressed or quantified. The implementation steps of the method are as follow: 1, a base station sends training sequences to users, and the users estimate channel information according to received signals and the sent training sequences; 2, the users in the system are grouped, and a timer is set for the users; 3, the user with the maximal channel norm is found by the timer, and the channel state information of the user is broadcasted to the other users in the same group; 4, correlation coefficients between the other users in the same group and the user with the maximal channel norm are computed, and the users of which the correlation coefficients are less than a given threshold of the system feeds back the channel state information of the users to the base station; and 5, the base station computes a set of users to send, and sending signals after being subjected to beam forming are sent to the users. According to the method, under the premise of small influence on the system and speed, the feedback quantity of the system is effectively reduced, and downlink resources of the system are effectively improved.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/12H04B7/04H04B7/06H04L25/02
CPCH04B7/0452H04B7/0617H04B7/0626H04W72/121H04L25/0228H04W72/542
Inventor 宫丰奎陈翔张南李栋
Owner XIDIAN UNIV
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