A Distributed Multi-User Downlink MIMO Robust Beamforming Method
A beamforming and distributed technology, applied in the field of multi-user downlink MIMO robust beamforming optimization design
Active Publication Date: 2018-02-06
深圳市佳贤通信科技股份有限公司
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] From a large number of existing Chinese and foreign literature surveys, it is found that although there are some robust beamforming designs for MIMO downlink users, they are all based on rational CSI channel conditions
In addition, there have been related studies in the existing literature based on the multi-user downlink multiple input single output (MISO, multiple input single output) robust beamforming problem under limited feedback channels or under the consideration of CSI with delay errors, based on The multi-user downlink MISO robust beamforming problem of limited feedback channels, but the above research also assumes that the channel estimation is ideal, that is, there is no channel estimation error
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0058] Embodiments of the present invention are described below. The flowchart of the distributed multi-user downlink MIMO robust beamforming method is as follows figure 2 , the implementation object is the kth user in the cell,
[0059] Step 10, start;
[0060] Step 20, under the condition that channel estimation, quantization and delay error exist simultaneously, establish the channel model matrix of the kth user, such as formula (3);
[0061] Step 30, based on the MMSE expression of signal leakage, a robust beamforming design problem is introduced, such as formula (7);
[0062] Step 40, use the KKT condition to solve, construct the Lagrangian equation, calculate the partial derivative, and obtain the beamforming matrix W of user k k , such as formula (12);
[0063] Step 50, solve for λ k beta 2 , such as formula (14);
[0064] Step 60, solving for β, such as formula (17);
[0065] Step 70, according to the above steps, deduce the optimal beamforming matrix of the d...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present invention proposes a distributed multi-user downlink MIMO robust beamforming method, specifically: in the actual mobile communication application of a multi-user multi-input multi-output frequency division duplex system, the channel state information CSI fed back to the base station BS by the mobile user Estimation, quantization and delay errors exist at the same time. Based on this channel condition, a robust beamforming method with distributed characteristics based on the minimum mean square error of signal leakage is proposed. This method can be applied to a more practical distributed mobile communication system, that is, the BS can independently design a beamforming matrix for a single mobile user, and can better meet the mobile user's demand for communication service quality QoS.
Description
technical field [0001] The present invention relates to a multiple-input multiple-output (MIMO, multiple input multiple output) communication system, in particular to multi-user downlink MIMO robust beamforming optimization design. Background technique [0002] MIMO technology, because of its advantages of effectively improving spectrum efficiency and transmission rate, has been widely used in modern communication systems, such as multi-cell multi-user cellular mobile communication systems. However, in a MIMO downlink system, multiple users communicate with the BS on the same time-frequency resource, and mutual interference between users is inevitable. Therefore, in order to solve such problems and eliminate interference, beamforming technology is generally selected for BS end. [0003] Early beamforming methods assume that the BS can obtain ideal CSI. However, in practical communication applications, the BS cannot obtain ideal CSI. For example, in a time division duplex ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
Inventor 任恩贤
Owner 深圳市佳贤通信科技股份有限公司