무선 통신 시스템에서의 Cross-Layer 재전송 기법 연구
Study on Cross-Layer Retransmission Scheme in Wireless Communication System
- 주제(키워드) retransmission , cross-layer , AMC
- 발행기관 아주대학교 대학원
- 지도교수 김재현
- 발행년도 2008
- 학위수여년월 2008. 8
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 본문언어 영어
초록/요약
In this thesis, we develop a cross-layer design scheme which combines adaptive modulation and coding (AMC) with several retransmission schemes known as hybrid automatic repeat request (HARQ) at the physical layer, automatic repeat request (ARQ) at the medium access control (MAC) layer and HARQ combined with ARQ in order to analyze the performance in terms of spectral efficiency and transmission delay. To evaluate the performance of spectral efficiency and transmission delay, we derive equations of the average packet error rate (PER) used in HARQ and ARQ, respectively. Numerical results reveal that maximizing the average spectral efficiency depends on the number of transmissions, not on the type of retransmission implemented. However, a noticeable gain in the average transmission delay has been offered by AMC with HARQ over AMC with ARQ. When retransmission schemes are exploited both at the PHY and MAC layer, HARQ and ARQ scheme respectively, the performance of ARQ relies on the performance of HARQ, which indicates that only HARQ would be desirable as long as it works perfect.
more목차
Contents = i
List of figures = ii
List of tables = iii
Abbreviations = I
Chapter 1. Introduction = 1
Chapter 2. System model = 4
2.1. System structure = 4
2.2. Features of HARQ and AMC = 6
2.3. Channel model = 9
Chapter 3. Cross-Layer design = 10
3.1. Performance constraints = 10
3.2. Combination of AMC with HARQ = 11
3.3. Combination of AMC with ARQ = 14
3.4. Combination of AMC with HARQ and ARQ = 16
Chapter 4. Performance analysis = 18
4.1. Average spectral efficiency = 18
4.2. Transmission delay = 22
Chapter 5. Numerical results = 24
5.1. Average spectral efficiency = 24
5.2. Transmission delay = 29
Chapter 6. Conclusion = 32
Reference = 34
