变时宽OCDM-IM通信系统设计及性能分析

doi:10.13229/j.cnki.jdxbgxb.20250031

Abstract

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

CLC Number:

TN914

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.

Figures/Tables 13

Fig.1

Table 1

AICs and mapped bits"

$I i$	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

Table 1

Fig.2

Fig.3

Table 2

System parameter settings"

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

Table 2

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

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