A mu-mimo system precoding method and power allocation method based on improved SLNR
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of precoding and precoding matrix, which is applied in the field of precoding method and power allocation of MU-MIMO system based on improved SLNR, can solve the problems of high signal bit error rate and high signal transmission bit error rate
Active Publication Date: 2021-09-14
GUANGXI UNIV
View PDF5 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to improve the traditional SLNR method, the defect that the bit error rate of signal transmission under partial channel state information is relatively high, and improve the medium power distribution in the above-mentioned scene at a lower cost The defect that the technical solution makes the signal error rate of the signal received by users with poor signal-to-noise ratio higher
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 more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0041] Such as figure 1 Shown is a block diagram of the MU-MIMO system applied in this embodiment.
[0042] In the traditional multi-user transmission strategy, the transmission data information of the base station can be expressed as:
[0043]
[0044] in, Denotes the transmission vector symbol of user k, Denotes the precoding matrix of user k
[0045] and satisfy the constraints E{xx H}=I N ,||w k || 2 =1.
[0046] The signal received by the user can be expressed as:
[0047] Among them, n kRepresents an additive Gaussian white noise sample with a mean of 0 and a variance of σ k 2 ; MU-MIMO channel of user k is a standard IID Rayleigh fading channel. M for user k k ×N channel matrix H k Expressed as:
[0048]
[0049] The traditional SLNR precoding method can be expressed as:
[0050]
[0051] Among them, SLNR k is the signal-to-leakage-to-noise ratio of user k.
[0052] The traditional SLNR precoding method is based on the SLNR of all user...
Embodiment 2
[0083] Existing precoding methods generally adopt a scheme in which the transmitting end allocates equal power to each user to allocate power to users. However, in an actual wireless communication system, the quality of channel state information (Channel State Information, CSI) of each user is generally different. For MIMO systems, the average bit error rate of all users is determined by the worst user bit error rate. Increasing the allocated power to improve the bit error rate has little effect on improving the user with a good signal-to-noise ratio, so that the above-mentioned equal power allocation scheme of increasing the allocated power to reduce the bit error rate is not economical.
[0084] Therefore, the present invention also proposes a power allocation method, which increases the transmission power for the worst user by increasing, so as to improve the overall channel quality. The specific method is as follows: the base station allocates based on the improved SLNR v...
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 invention discloses a MU-MIMO system precoding method based on improved SLNR, which is characterized in that the method is based on the minimum mean square error of the channel modification matrix, and obtains the co-channel interference of other users in the revised estimated channel matrix in the SLNR method The channel modification matrix of the quantity; obtain the optimal precoding matrix of the improved SLNR index based on the channel modification matrix; the estimated channel matrix is configured to estimate incomplete channel state information. In addition, the present invention also discloses a power allocation method based on the improved SLNR-based MU-MIMO system precoding method, the base station allocates based on the improved SLNR value of each user; the power allocated to each user k is the same as that of the user k The improved SLNR value is inversely proportional. For signal transmission under partial channel state information, the present invention can effectively improve the defect of high bit error rate in the traditional SLNR method, and can improve the signal received by users with poor signal-to-noise ratio in the equal power allocation technical scheme at a lower cost A defect with a high bit error rate.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to an improved SLNR-based MU-MIMO system precoding method and power allocation method. Background technique [0002] The popularity of multimedia applications such as smart terminals and social networks has led to a substantial increase in the demand for system capacity and reliability of mobile cellular networks. A Multiple User Multiple Input Multiple Output (Multiple User Multiple Input Multiple Output, MU-MIMO) system is widely used because it can effectively increase channel capacity. The MU-MIMO system greatly improves the system performance by increasing the multiplexing and diversity gain without increasing the bandwidth and transmission power. [0003] In the MU-MIMO downlink model, one of the main goals in designing an optimal linear MU-MIMO precoding scheme is to optimize the SNR, however, due to its coupling nature, this problem is challenging. I...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more