a study on the spectrum efficient multi-hop wireless network

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On the other hand, the backbone network is represented by the dotted purple arrows in Fig 1.5. My research focuses on wireless backbone instead of the conventional wired network. The aim is to investigate on how to achieve a low delay/high throughput wireless multi-hop. Using a multi-radio wireless access points, investigated the interference effect on throughput in a short rage wireless network and a long corridor environment as shown in Fig 1.5. Moreover, I proposed an interference canceller for such kind of interference and tested it in different actual indoor environments. To summarize this research, it deals with some of the issues which hinder the ability of multi-hop wireless network to achieve the desired performance. The aim is to maximize the spectral efficiency of the multi-hop wireless network by proposing solution on some of the common problems that faces the multi-hop wireless network such as, mobility and interference. The research is organized into two main divisions as shown in Fig 1.6. User mobility has a huge impact on the throughput. The mobility model used also has impact on the simulated results. I proposed a different mobility model than the conventional random way point model. The choice of routing protocol also has an impact on the performance (throughput). My focus is on the route state hold time parameter in AODV routing protocol to achieve packet delivery rate improvement. Multi-hop wireless networks Mobility Interference Figure 1.6: Thesis organization Due to the fact that more devices recently are equipped with multiple radio interfaces, the interference problem became much more severe than before. The focus is on the inter-channel interference between multiple antennas on the same device in WMN. All the simulated results and the conducted experiments are indoor environment. For 7
the mobility case, the Mobile Ad-hoc network (MANET) was the clear choice because it is a mobility centric multi-hop wireless network. Different mobility models can be implemented in MANET due to the availability of wide range of routing protocols suitable for mobility cases. In case of the interference, I focused on the interference between radios in multi-radio devices. These devices became very popular recently in Wireless Mesh Networks (WMNs) due to its advantages in offering enhanced performance. 1.7 Thesis overview This thesis is organized in 6 chapters as follows: Chapter 2: This chapter gives an overview of the route discovery process in Ad-hoc on Demand Routing Protocol and importance of ART parameter in MANET. The chapter also presents the background of the Ad-hoc routing protocols and a comparison between two Ad-hoc routing protocols. Chapter 3: This chapter presents the Simulated MANET model for the proposed Mobile in OPNET with a description of the simulation parameters and scenarios. In addition, an explanation about the mobility model utilized in the simulation is discussed in the chapter along with the analysis of results collected from the simulation. Chapter 4: This chapter gives an introduction about multi-hop/ multi-radio Wireless Mesh Networks (WMN). Furthermore, the chapter focuses about the interference problem in general and WMN interference challenges. Effect of interference was investigated. A novel interference canceller is proposed and tested experimentally. Chapter 5: This chapter focuses on the various experimental scenarios conducted about throughput improvement of wireless mesh networks. The proposed interference cancellation circuit is implemented in this chapter along with the discussion of the results collected. Chapter 6: This chapter concludes the research that’s has been done in this thesis. Suggestions for future work are also given in this chapter. 8
Page 1: A STUDY ON THE SPECTRUM EFFICIENT M
Page 4 and 5: Copyright @ 2009 by WADHAH HAFIDH A
Page 6 and 7: 、上記条件下で、4 m/s
Page 8 and 9: The WMN experiments showed that the
Page 10 and 11: Table of Contents Abstract in Japan
Page 12 and 13: List of Figures Figure 1.1: Infrast
Page 14 and 15: List of Tables Table 2.1: Compariso
Page 16 and 17: CHAPTER 1 Introduction 1.1 IEEE 802
Page 18 and 19: The performance of a random media a
Page 20 and 21: 1.4 Interference problem Interferen
Page 24 and 25: CHAPTER 2 Mobile Ad-hoc Network 2.1
Page 26 and 27: Route Request AODV Intermediate nod
Page 28 and 29: Request (RREQ) [4] in order to iden
Page 30 and 31: DATA Motion Figure 2.4: Higher mobi
Page 32 and 33: CHAPTER 3 Packet Delivery Rate (PDR
Page 34 and 35: Table 3.1: Simulation Parameters Pa
Page 36 and 37: oute stat hold time parameter in th
Page 38 and 39: speed values due to the ability of
Page 40 and 41: Figure 3.7:Coverage area and moveme
Page 42 and 43: Figure 3.8: Simulated Ad-hoc mobile
Page 44 and 45: Figure 3.9: Example of Convergence
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Page 48 and 49: Figure 3.14: Number of users vs. Me
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Page 52 and 53: 3.9 Chapter summary Four simulation
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Page 58 and 59: Figure 4.4: Interference in Multi-r
Page 60 and 61: Figure 4.6: Phase Shift and cancel
Page 62 and 63: As mentioned before, it was shown i
Page 64 and 65: Basically, the experiments are cate
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Page 68 and 69: The directional coupler is a passiv
Page 70 and 71: Figure 5.7: Throughput vs. SIR (Int
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Figure 5.10: Three hop WMN with two
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Table 5.2:Throughput of Mutli-hop W
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PathLoss ( dB) = 40 + [35log10 D( m
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Figure 5.17: Actual Interference ca
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Figure 5.20: Attenuation value vs.
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Figure 5.22 illustrates the S 21 pa
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link. The experimental results show
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Scenario A.1 This scenario simulate
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Destination address Table Table A.1
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Figure B.2: Attenuation value vs. t
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[10] S Gowrishankar, T G Basavaraju
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[32] Jing Zhu and Roy, S., “802.1
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