Peak-to-average ratio suppression method based on constructive interference in ofdm system
A peak-to-average ratio suppression and constructive technology, applied in transmission systems, multi-carrier systems, digital transmission systems, etc., can solve the problems of slow iterative convergence speed, unfavorable system use, high computational complexity, and achieve good peak-to-average ratio suppression. The effect of performance, reducing the difficulty of solving, and speeding up the iteration speed
Active Publication Date: 2021-11-19
陕西泽芯科技有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The disadvantage of this method is that the iterative convergence speed is slow. If the system requires a high peak-to-average ratio of the desired signal, multiple iterations are required, and the computational complexity is high, which is not conducive to the use of the actual system.
However, the quadratic programming problem in this method is limited by multiple variables, and it is difficult to find a closed-form solution. Each iteration will generate a large amount of calculations, which hinders the application of this method in practical wireless communication systems.
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
[0038] The specific implementation and effects of the present invention will be further described below in conjunction with the accompanying drawings.
[0039] refer to figure 1 , the downlink transmitter model used in the present invention includes the number of antennas M, the number of users K, and the number of subcarriers N. In this example, the number of antennas M=100, the number of users K=10, and the number of subcarriers N=256;
[0040] refer to figure 2 , the implementation steps of this example are as follows:
[0041] Step 1, input the modulated signal s, and perform precoding processing on it to obtain the precoded signal a:
[0042] (1.1) The modulation mode is set to be 256QAM, and the modulated signal s=[s is generated according to the number of subcarriers and the number of users 1 ,s 2 ,...,s n ,...,s N ] T , where s n ∈ C K×1 Indicates the data sent to K users on the nth subcarrier, n=1,2,...,N, [·] T Represents the transpose of a matrix;
[004...
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 peak-to-average ratio suppression method based on constructive interference in an OFDM system, which mainly solves the problem that the peak-to-average ratio of signals sent by the existing method in the OFDM system is too high. The technical solution includes: firstly, precoding the modulated signal; then rearranging the precoded signal and performing OFDM modulation; then, taking the maximum value of the transmitted signal in the time domain as the optimization goal, and using the scalable constructive interference Constrained by regional conditions, the OFDM system downlink peak-to-average ratio suppression model is constructed; then, the G-ADMM algorithm is used to complete the iterative solution of the model, and finally a signal with a low peak-to-average ratio is obtained. The invention reduces the peak-to-average ratio of signals sent by the OFDM system and is suitable for practical system applications.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a peak-to-average ratio suppression method, which can be used to reduce the peak-to-average ratio of signals in an OFDM system. Background technique [0002] Compared with the traditional single-carrier transmission system, one of the main disadvantages of OFDM technology is that the signal has a higher peak-to-average power ratio PAPR. The output signal of OFDM is the result of the superposition of multiple sub-channel signals. Therefore, when multiple signals have the same phase, a signal with very high instantaneous power will be generated after the superposition of the sub-channels. Once the linear amplification range of the amplifier is exceeded, it will make the The signal produces nonlinear distortion, which seriously affects the communication performance of the system. In the future, mobile communications will face more complex application scenarios. The n...
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): H04L27/34
CPCH04L27/3411
Inventor 李靖陈亚男葛建华任德锋李慧芳高明
Owner 陕西泽芯科技有限公司