Down link multiple-user dispath for multiple-transmission antenna and multiple-receiving antenna system

Abstract

A multi-user scheduling method for the down link in multi-input multi-output antenna system includes such steps as choosing a subset of emitting antenna on base stating by user terminal, feeding back the indicator of the antenna subset and channel state information, and determining the distribution relation between emitting antenna and user terminal in next transmission time slot according to scheduling algorithm.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a downlink multi-user diversity and scheduling method in a multiple-input multiple-output system. Background technique [0002] The MIMO wireless communication system is a system that simultaneously applies multiple antennas to the transmitting end and the receiving end. Assume that the number of antennas at the sending end is N T , the number of antennas at the receiving end is N R . It is proven to greatly increase the channel capacity of the system. In theory, the channel capacity of a MIMO system is proportional to the minimum number of transmitting antennas and receiving antennas. In addition, it does not need to expand the spectrum width, so it has high spectrum efficiency. [0003] The MIMO system mainly has two system applications: one is spatial multiplexing, such as D-BLAST or V-BLAST, which demultiplexes the data stream into N T sub-streams and in N T Send ...

AI Technical Summary

Problems solved by technology

[0019] The disadvantage of prior art 1 is that: users are only scheduled in time, without taking advantage of the spatial channel changes of each user; the time scheduling does not take into account the diversity gain of multiple users

[0020] The disadvantage of prior art 2 is that in the first mode, users are fixedly pre-assigned to certain antennas

Although this can simplify the algorithm design, the overall performance will be significantly affected, which is a sub-optimal solution; in the second mode, the user is only dynamically allocated to a transmitting antenna at the base station

This will limit the user's maximum downlink transmission data rate

[0021] The disadvantage of prior art 3 is that the scheduling algorithm estimates the performance of each sub-hypothesis of each hypothesis to schedule users. Although this algorithm can be regarded as an optimal multi-user scheduling algorithm, its computational complexity is undoubtedly quite high of

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