A Practical OFDM-based Integrated Sensing and Communication System for 6G Wireless Networks
- 주제(키워드) 6G , Orthogonal frequency division multiplexing （OFDM） , Integrated sensing and communication （ISAC） , Clustering , Multiple access
- 주제(DDC) 004.6
- 발행기관 아주대학교 일반대학원
- 지도교수 Bang Chul Jung
- 발행년도 2026
- 학위수여년월 2026. 8
- 학위명 석사
- 학과 및 전공 일반대학원 AI융합네트워크학과
- 실제URI http://www.dcollection.net/handler/ajou/000000036164
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In this paper, we propose a practical orthogonal frequency division multiplexing （OFDM）-based integrated sensing and communication （ISAC） framework for 6G networks. A base station equipped with a uniform linear array （ULA） antenna receives a single sequence transmitted by a user equipment （UE） via an OFDM waveform, with the objective of simultaneously estimating both the communication information and the location of the UE. Specifically, the orthogonality of the sequence transmitted by the UE is exploited to estimate the communication information and the range of the UE, while the ULA at the base station is employed to estimate the angle of arrival. To enable robust localization not only under ideal line-of-sight （LOS） conditions but also in the more practical scenario where the LOS path is unavailable, a clustering technique is incorporated to handle non-line-of-sight （NLOS） environments. Furthermore, to achieve superior localization performance, this paper proposes an oversampling scheme designed to enhance range estimation resolution. In addition, to meet the diverse requirements of next-generation communications, two distinct OFDM-based ISAC schemes are proposed to support different multi-user environments. First, a sequence set partitioning scheme is applied for grant-based access, which is well-suited for scenarios where high data throughput is prioritized. Second, a parity bit insertion scheme is introduced for grant-free access, designed to support large-scale user environments. Through extensive computer simulations, the superiority of the proposed framework is demonstrated in terms of both communication performance and localization accuracy. Furthermore, by adopting a design that maintains compatibility with conventional OFDM architectures, it is shown that ISAC, which serves as a core technology for next-generation wireless communications, can be practically integrated into existing infrastructure.
more목차
1 Introduction 1
1.1 Background 1
1.2 Integrated Sensing and Communication 2
1.3 Orthogonal Frequency Division Multiplexing 3
1.4 Related Work 3
1.5 Motivation and Contributions 8
1.6 Organization 11
2 OFDM-based ISAC System for a Single-User Environment 13
2.1 Introduction 13
2.2 System Model 14
2.3 Proposed Communication Scheme 20
2.4 Proposed Localization Scheme 21
2.5 Simulation Results 24
2.6 Summary 29
3 OFDM-based ISAC System in a Non-Line-of-Sight Environment 30
3.1 Introduction 30
3.2 System Model 31
3.3 Enhanced Localization via a Clustering Algorithm 33
3.4 High-Resolution Ranging via Oversampling 35
3.5 Simulation Results 38
3.6 Summary 44
4 OFDM-based ISAC System for Multi-User Environment 45
4.1 Introduction 45
4.2 Grant-based Multi-User Integrated Sensing and Communication System 46
4.2.1 System Mode 46
4.2.2 Proposed Multiple Access Scheme 47
4.2.3 Simulation Results 50
4.3 Grant-free Multi-User Integrated Sensing and Communication System 65
4.3.1 System Model 65
4.3.2 Proposed Multiple Access Scheme 66
4.3.3 Simulation Results 72
4.4 Summary 80
5 Conclusions 81
Bibliography 84
