面向無(wú)線網(wǎng)絡(luò)的中繼協(xié)助傳輸研究
[Abstract]:With the rapid development of communication technology, rapid expansion has become the most critical problem in the next generation wireless network. Relay has the advantages of good performance, easy to expand and easy to deploy in the new generation of network standards. In this paper, three typical scenarios-WiMAX, data center network and cellular network-are selected as carrying scenarios for relay performance research. For the current WiMAX network using multi-hop relay technology, DPRP (Dual-Path Relay Placement) is proposed to optimize the relay layout. DPRP achieves spatial multiplexing through two parallel symmetric multi-hop relay links. For a given attenuation factor, when the user's spectral efficiency exceeds a certain limit, the relay is more efficient than SPRP (Single-Path Relay Placement) DPRP). The analysis shows that the higher the spectrum efficiency of the user, the more obvious the advantage of DPRP. For a single cell, if the combination of SPRP and DPRP is used, the overhead of relay will be greatly reduced. Data center network routing is complicated and expensive, which urges people to introduce wireless relay to alleviate the congestion problem of frame. Researchers have made a lot of achievements in wireless data centers, but so far no one has focused on power allocation. Therefore, this paper proposes a dynamic power allocation strategy, which is simple and easy to implement, and can greatly improve the throughput of wireless data center network. The simulation results show that the dynamic power strategy is indeed superior to the traditional equal-power transmission strategy. In cellular networks, more and more attention is paid to the rational management of data traffic. The first problem is that part of the user flow is not enough, but the other part is not exhausted. Based on this, an assisted transmission system is designed to optimize the experience of all users. The premise is that users with residual traffic are willing to assist other users to download something, and then transfer the downloaded data to the requesting user through WiFi. In order to ensure the implementation of the system, the first step is to propose a UDP protocol based on LT code, which can ensure the normal operation of the assistance. Then a practical system is designed to verify that users can manage their own data more effectively and can greatly improve their download rate.
【學(xué)位授予單位】:復(fù)旦大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN929.5
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