变时宽OCDM-IM通信系统设计及性能分析

doi:10.13229/j.cnki.jdxbgxb.20250031

摘要/Abstract

摘要：

为了提升正交线性调频分复用索引调制（OCDM-IM）系统的隐蔽性，提出了一种变时宽变索引映射方法，构建了VT-OCDM-IM系统。该系统通过同一组伪随机序列选取时宽和索引映射方法，打乱信号周期性，提高系统在检测信号周期性特征场景下的隐蔽性能。仿真和实验结果表明：在变时宽的同时改变系统的子载波数量，特定环境下拥有更高的可靠性，同时能够在保证系统传输速率的优势下提升系统隐蔽性能。

关键词: 通信与信息系统, 隐蔽通信, 正交线性调频分复用, 索引调制, 变时宽

Abstract:

To enhance the covertness of the Orthogonal Chirp Division Multiplexing with Index Modulation （OCDM-IM）， a variable time-width and index mapping scheme is proposed to construct the corresponding VT-OCDM-IM system. By selecting time-width and index mapping methods using the same pseudorandom sequences， the system disrupts signal periodicity and enhances covert performance in scenarios where detecting signal periodicity features is critical. Simulation and experimental results show that altering the number of subcarriers alongside variable time-width improves reliability under certain conditions while enhancing covert performance without compromising the system's transmission rate advantage.

Key words: communication and information systems, covert communication, orthogonal chirp division multiplexing, index modulation, variable time width

中图分类号:

TN914

宁晓燕,邵宇豪,叶帅,王震铎. 变时宽OCDM-IM通信系统设计及性能分析[J]. 吉林大学学报(工学版), 2026, 56(8): 2240-2248.

Xiao-yan NING,Yu-hao SHAO,Shuai YE,Zhen-duo WANG. Variable time width OCDM-IM communication system design and performance analysis[J]. Journal of Jilin University(Engineering and Technology Edition), 2026, 56(8): 2240-2248.

图/表 13

图1

表1

AICs和映射比特"

$I i$	AICs	$Z$	$I g$	$P I$
$I 1$	$1,2$	0	1100	10
$I 2$	$1,3$	1	1010	11
$I 3$	$2,3$	2	0110	-
$I 4$	$1,4$	3	1001	-
$I 5$	$2,4$	4	0101	00
$I 6$	$3,4$	5	0011	01

表1

图2

图3

表2

系统参数设置"

方法	基信号	时宽个数	DFT/DFnT 大小	星座映射	激活子载波/ $N$	带宽/kHz	$T$ /s	$T c p / s$	比特速率/（kbit·s^-1）
OFDM-IM	正弦信号	1	256	BPSK	64	6.4	0.04	0.01	3.84
OCDM	Chirp	1	256	BPSK	64/128	6.4	0.04	0.01	1.92/3.84
OCDM-IM	Chirp	1	256	BPSK	64	6.4	0.04	0.01	3.84
VT-OCDM-IM	Chirp	4	128/256/384/512	BPSK	32/64/96/ 128	6.4	0.02/0.04/ 0.06/0.08	0.005/0.01/ 0.015/0.02	3.84

表2

图4

图5

图6

图7

图8

图9

图10

图11

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