A method of OFDM waveform design based on pmepr-pslr joint optimization

A waveform design and joint optimization technology, applied in the field of OFDM signal modeling, can solve the problems of single parameter optimization, without considering the peak sidelobe suppression problem, etc., to improve the detection performance, smooth the envelope, and achieve the effect of easy

Active Publication Date: 2020-05-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the document "Low PMEPROFDM radar waveform design using the iterative least squares algorithm. IEEE Signal Processing Letters, 22.11(2015): 1975-1979", a subcarrier reservation-based reduction of OFDM signal PMEPR (Peak Average Envelope Power ratio) algorithm, which converts the optimization problem into a least squares problem, and uses an iterative algorithm to solve it, but only considers a single parameter optimization, and does not consider the peak sidelobe suppression problem

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  • A method of OFDM waveform design based on pmepr-pslr joint optimization
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  • A method of OFDM waveform design based on pmepr-pslr joint optimization

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Embodiment Construction

[0064] The present invention mainly adopts the method of computer simulation for verification, and all steps and conclusions are verified correctly on MATLAB-R2014a. The specific implementation steps are as follows:

[0065] Step 1. Initialize system parameters

[0066] Assume that the OFDM signal bandwidth B=100MHZ, time width T=2.075μs, number of subcarriers N=128, subcarrier frequency interval Δf=B / N, number of sampling points K=N=128, sampling rate f s =N / T, the number of accumulated pulses is 10 4 , the corresponding number of randomization vectors is 10 5 . Assume that the distance and speed information of the two targets are (100m, 3m / s), (200m, 4m / s), and the signal-to-noise ratio is 20dB.

[0067] Step 2. Signal model establishment

[0068] The corresponding OFDM signal is discretely processed, and its matrix expression s=Fa is obtained, where a represents the weight vector to be optimized, Represents the Fourier transform matrix.

[0069] Step 3. Optimizati...

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Abstract

The invention discloses an OFDM waveform design method based on PMEPR-PSLR joint optimization. Existing waveform designs for OFDM signals all consider the optimization of a single parameter, that is, only optimize the peak-to-average envelope ratio (PMEPR) or the peak-to-sidelobe level ratio (PSLR). Considering that the modern electronic combat system tends to be comprehensive and integrated, that is, the research on radar communication integrated signal design is becoming more and more mature, not only the radar detection performance of the signal must be considered, but also its application in communication. For this reason, the present invention considers utilizing the convex optimization theory to construct an optimization problem with PMEPR as the objective function and PSLR and energy as constraints. Firstly, using the relaxation method of SDP, the problem is simplified, and the CVX toolbox is used for related processing. Then, use the method of randomization to approximate the optimal solution. The feasibility of the design method can be further verified through simulation experiments, and the values ​​corresponding to PMEPR and PSLR have also been improved accordingly.

Description

technical field [0001] The invention belongs to the field of radar communication integrated waveform design, and particularly relates to OFDM (orthogonal frequency division multiplexing) signal modeling, optimization theory and radar detection fields. Background technique [0002] With the continuous development of modern science and technology, modern military warfare is changing towards the direction of systematic confrontation. This requires modern combat platforms to be equipped with numerous electronic combat equipment to improve the survivability and comprehensive combat capabilities of combat platforms. That is, how to realize the horizontal integration of various system equipment has become a common concern of many research experts and scholars. Exploring and researching the related technologies of the comprehensive and integrated electronic warfare system has become one of the key issues to be solved in modern warfare. OFDM signal is a typical communication signal...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 崔国龙李雯李洋漾熊丁丁王祥丽杨婧孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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