Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming

Guo LI; Ni WEN; Fengkui GONG; Jian ZHANG; Sihan ZHANG

doi:10.11959/j.issn.1000-436x.2021173

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Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming

Papers | 更新时间：2024-06-05

- Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming
- Journal on Communications Vol. 42, Issue 9, Pages: 194-204(2021)
- 作者机构：
  
  1. 西安电子科技大学ISN国家重点实验室，陕西西安 710071
  2. 中国西南电子技术研究所，四川成都 610036
- 作者简介：
- 基金信息：
  
  Youth Program of National Natural Science Foundation of China(61901325);Youth Program of National Natural Science Foundation of China(62001354);The National Key Research and Development Program of China(2018YFE0100500);China Postdoctoral Science Foundation Project(2018M640958);Technology Innovation Leading Pro-gram of Shaanxi(2020CGXNG-036)
- DOI：10.11959/j.issn.1000-436x.2021173
  CLC： TN929.5
- Online First：2021-09，
  
  Published：25 September 2021
- 稿件说明：
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Guo LI, Ni WEN, Fengkui GONG, et al. Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming[J]. Journal on Communications, 2021, 42(9): 194-204.
DOI：

Guo LI, Ni WEN, Fengkui GONG, et al. Interference detection and diversity suppression algorithm of OFDM system under partial-band jamming[J]. Journal on Communications, 2021, 42(9): 194-204. DOI： 10.11959/j.issn.1000-436x.2021173.

摘要

面向目前应用广泛的正交频分复用（OFDM）系统，提出了一种基于前向连续方差去除（FCVE）的干扰检测算法和基于频率分集的干扰抑制算法，通过该组合策略大幅提高了部分频带干扰条件下的通信性能。理论推导了FCVE算法的门限因子，并利用设定的门限因子和接收信号方差计算得到干扰检测门限值，进而实现高准确度的干扰检测。仿真结果表明，所提 FCVE 算法在高信干比（SIR）条件下显著提高了经典的前向连续均值去除（FCME）算法的干扰检测概率。进一步地，利用干扰检测结果，基于频率分集思想进行干扰抑制，仿真结果表明，在相同信干比条件下，系统误比特率（BER）可降低2个量级。

Abstract

For the currently widely-used OFDM system

which greatly improved the communication performance under the condition of partial-band jamming

an interference detection algorithm based on FCVE and an interference suppression algorithm based on frequency diversity were proposed.The threshold factor formula of FCVE algorithm was derived theoretically

and the interference detection threshold was calculated by using the threshold factor and the variance of the received signal

so as to achieve the interference detection with high accuracy.The simulation results show that the proposed FCVE algorithm significantly improves the interference detection probability of the classical FCME algorithm under the condition of high signal to interference ratio (SIR).Further

the interference can be greatly suppressed based on the idea of frequency diversity with the result of interference detection.The simulation results show that the bit error rate of the system can be reduced by two orders of magnitude under the same SIR.

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references

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