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It is because the user pairing procedure usually cannot find proper paired users for MU-MIMO transmission in small user number case.
While the number of users increases, it has more users with little inter-user interference, and then the user pairing procedure for USS feedback is easily to find proper paired users for MU-MIMO.
Hence, the user pairing procedure cannot find proper users to form MU-MIMO in this region, and performance will be decreased when SU transmission is adopted.
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Otherwise, user pairing will be stopped and start ZF procedure to compute precoding matrix for the users in set MU. (4) If the number of paired user is enough, start ZF procedure to transmit users' data.
Simulation evaluates the proposed 3D codebook aided user pairing scheme and compares with the previous 2D MU-MIMO user pairing technology.
A multiple-user MIMO (MU-MIMO) user pairing scheme was proposed, in which the vertical dimension was taken into consideration.
3 Random user pairing.
The pairing procedure continues as described in the following section.
This can significantly improve the success rate of user pairing.
The user pairing can be classified as two methods basically.
It can be achieved by employing the user pairing.
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