SDMA transmission method and base station in multi-carrier mu MIMO system

Abstract

The present invention provides a method for scheduling a SDMA user group in an MU MIMO system and a base station. The method comprise the following steps: calculating, according to channel state information, a projection matrix of a channel matrix of each user in a user group on a joint channel matrix of other users in the same user group, where the user group is selected from a plurality of users; calculating a capacity metric of the user group according to the projection matrixes; and selecting an optimal user group according to the metrics of a plurality of user groups. The present invention effectively eliminates the MUI on terminal users at the transmitter side, and reduces the computational complexity.

Description

technical field [0001] The invention relates to a communication network, in particular to a space division multiplexing access technology based on multiple input and multiple output. Background technique [0002] The MIMO technology (Multiple-Input Multiple-Output, Multiple Input Multiple Output) allows multiple antennas to simultaneously transmit and receive multiple spatial streams. The capacity of the channel can be increased by using the MIMO technology, and at the same time, the reliability of the channel can be improved and the bit error rate can be reduced. And SDMA (Space Division Multiple Access, Space Division Multiple Access) is a newly developed multiple access technology, which uses space division to form different channels. Because SDMA technology has the potential to greatly improve the capacity and performance of wireless communication systems, it has attracted extensive attention from researchers. [0003] However, when SDMA technology is applied to MUMIMO...

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Problems solved by technology

[0012] However, the prior art mechanism is proposed for only one antenna at the UT side

In addition, the precoding algorithm is limited to the zero-breaking method, and it does not give how the scheduling mechanism is used in conjunction with the existing precoding algorithm

This method selects the largest user combination after calculating the zero-forcing (ZF) capacity or SNR of each user combination. When calculating the capacity, this method introduces the zero-forcing method to calculate the weight matrix, but does not consider MUMIMO transmission. architecture

Also, it should be noted that the index in this mechanism is only designed for a subcarrier in a single-carrier system or a multi-carrier system, and cannot be directly extended to a multi-carrier system.

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