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, etc., and achieve good peak-to-average ratio suppression Effects of performance, easier handling, faster iteration speed
Active Publication Date: 2020-07-24
陕西泽芯科技有限公司
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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.
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[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;
[0043...
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The invention discloses a peak-to-average power ratio suppression method based on constructive interference in an OFDM (orthogonal frequency division multiplexing) system, and mainly solves the problem that the peak-to-average power ratio of a signal sent by an existing method in the OFDM system is too high. According to the technical scheme, the method comprises the following steps: firstly, pre-coding a modulation signal; rearranging the pre-coded signals and carrying out OFDM (Orthogonal Frequency Division Multiplexing) modulation on the pre-coded signals; then, by taking the maximum valueof the time domain sending signal as an optimization target and taking an extensible region condition of constructive interference as a constraint, constructing an OFDM system downlink peak-to-averageratio suppression model; and then, completing iterative solution of the model by using a G-ADMM algorithm, and finally, obtaining a signal with a low peak-to-average ratio. According to the invention, the peak-to-average ratio of signals sent by the OFDM system is reduced, and the method is suitable for practical system application.
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...
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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