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Multi-user dispatching method in MIMO system and device thereof
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A multi-user scheduling and multi-output technology, applied in diversity/multi-antenna systems, space transmit diversity, error prevention/detection through diversity reception, etc., can solve problems such as large difference, multi-user diversity gain reduction, system capacity reduction, etc.
Inactive Publication Date: 2014-07-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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In the case of pairing failure, the base station only selects the user with successful pairing or selects a single user for service. At this time, the multi-user diversity gain is reduced to a certain extent, and the system capacity is correspondingly reduced, resulting in low system performance.
[0036] For ZF multi-user scheduling, although each mobile station selects the optimal quantized channel matrix for itself as the basis for user scheduling by the base station, in this technology, the base station side obtains the precoding matrix through ZF operation, and the precoding matrix The coding matrix differs greatly from the actual CQI of each user, which will lead to poor system performance
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Embodiment 1
[0136] In this embodiment, the method of fixing the number of users is adopted to implement multi-user scheduling. In other words, in this embodiment, the threshold value R of the number of scheduled users is preset and satisfies 2≤R≤M T , where M T is the number of transmitting antennas of the base station.
[0137] Figure 5 A flow chart of the multi-user scheduling method in this embodiment is shown. see Figure 5 , the method includes:
[0138] In step 501, the user of the mobile station selects an optimal vector matching itself from a preset codebook as a quantized channel according to its own channel matrix.
[0139] The preset codebook in this embodiment may be a Grassmannian codebook, or a channel vectorization codebook, or a DFT-based codebook, or another codebook that maximizes the minimum vector distance. No matter which codebook is used, the codebook contains N t vectors, each of dimension M T ×1, that is, the codebook is M T ×N t dimension matrix.
[01...
Embodiment 2
[0191] In this embodiment, the method of variable number of users is adopted to implement multi-user scheduling. In other words, although the threshold value R of the number of scheduled users is preset in this embodiment, and it satisfies 2≤R≤M T , where M Tis the number of transmitting antennas of the base station, but if the users waiting for scheduling matching the current precoding vector are loaded, the system capacity will increase and the sum of the determined scheduled users and the users waiting for scheduling does not exceed the threshold of the number of scheduled users If the value is R, the user waiting to be scheduled is loaded as the scheduled user.
[0192] Figure 7 A flow chart of the multi-user scheduling method in this embodiment is shown. see Figure 7 , the method includes:
[0193] In steps 701-703, the user of the mobile station selects the optimal vector matching itself from the preset codebook as the quantized channel according to its own channe...
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Abstract
The invention provides a multi-user dispatching method in an MIMO system and a device thereof. The method comprises the following steps that: each mobile station selects an optimized vector which is matched therewith in a preset codebook as a quantifying information channel, computes information channel quality information corresponding to the quantifying information channel, and reports the information to a base station; and the base station selects a first user to be dispatched from users to be dispatched according to a preset dispatching principle, obtains a unitary matrix from the quantifying information channel corresponding to the first user to be dispatched by means of orthogonal decomposition, and takes the users which are matched with the other column vectors except the first column vector in the unitary matrix as the other users to be dispatched. The scheme of the invention can effectively improve the performance of the MIMO system.
Description
technical field [0001] The present invention relates to a multi-user (Multi-User)-multiple-input multiple-output (Multiple-Input Multiple-Output) technology, in particular to a multi-user scheduling method and device in an MIMO system. Background technique [0002] The development of multi-antenna technology promotes the expansion of MIMO technology from the traditional point-to-point single-user (Single-User)-MIMO system to the point-to-multipoint MU-MIMO system. The realization of multi-user simultaneous transmission brings many advantages, for example: the diversity gain of multi-antenna can improve bit error performance, the multiplexing gain of multi-antenna can expand the channel capacity area of multi-user, and the scheduling of multi-user can provide multi-user diversity ,wait. In order to enable the MIMO system to transmit signals of multiple users on the same time, frequency, and code domain resources, and to reduce multi-user co-channel interference (Co-channel...
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