臺灣博碩士論文加值系統

在之前的研究指出，當傳送訊息給多個不同的連線特性的接收端時，不均等錯誤保護技術常被應用於改善無線通訊系統的整體效能。例如，這些特性可能相當於不同的路徑耗損、衰減或干擾等。利用廣播通道，在傳輸給較弱能力的接收端時能花費很低的成本去包含一個額外的訊息給較強能力的接收端。(依據所需接收端的錯誤機率或所需傳送的能量)這項技術稱為同時廣播(Simulcasting)或多重傳送(multicast signaling)，在我們的論文研究中將這項技術使用在Ad Hoc網路中，我們討論如何選擇同時廣播技術的參數去影響的網路效能。由模擬結果可知，在無線Ad Hoc網路中適當的選擇同時廣播技術能有效的改善鏈結傳輸量和網路連接。

In previous works, unequal error-protection techniques have been used to improve the throughput of the wireless communication system with different connection characteristics. For instance, these characteristics may correspond to the differences in path loss, fading, or interference.
By taking advantage of the broadcast nature of the channel, it takes very little cost (in terms of the required energy at the transmitters or the error probabilities at the receivers) to include additional messages for the more-capable receivers on the transmissions to the less-capable receivers. The technique for including additional messages was termed simulcasting or multicast signaling. In this thesis, we consider the use of this technique in an ad hoc network. We investigate how to choose the parameters of the simulcasting technique to improve the network performance. Simulation results indicate that a proper choice for the parameters of the simulcasting technique can effectively improve the link throughput and the network connectivity in wireless ad hoc networks.

目 錄
致 謝 i
中文摘要 ii
英文摘要 iii
目 錄 iv
圖 目 錄 vi
表 目 錄 viii
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 1
1.3 論文架構 2
第二章 相關技術背景 3
2.1 前言 3
2.2 廣播通道(Broadcast channel) 3
2.2.1 ALOHA 通訊協定 4
2.3 Ad Hoc無線網路 5
2.4 無線廣播傳輸種類 7
2.4.1 單點傳送（Unicasting） 7
2.4.2 全體廣播傳送（Broadcasting） 8
2.4.3 群組廣播傳送（Multicasting） 9
2.5相位移鍵調變（M-phase-shift-key modulation） 10
2.6 通道多工技術 12
2.6.1 分頻多工（FDMA；Frequency Division Multiple Access） 13
2.6.2 分時多工（TDMA；Time Division Multiple Access） 13
2.6.3 分碼多工（CDMA；Code Division Multiple Access） 14
2.6.4 空間分隔多工（SDMA；Space Division Multiple Access ） 15
第三章 同時廣播技術 17
3.1 前言 17
3.2 Nonuniform QPSK 17
3.3 網路參數 18
3.4 系統分析 24
3.4.1 路由演算法 （Routing Algorithm） 24
3.4.2 封包選擇演算法 （Packet-Selection Algorithm） 26
3.4.3 數學分析 28
第四章 模擬結果與分析 33
4.1 模擬環境說明 33
4.2程式流程圖 35
4.3模擬結果 37
第五章 結論與期望 50
參考文獻 51

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