為了提升使用者便利性，近年來消費性電子產業快速地朝向可攜式與穿戴式的商品發展，這使得原本就有限的無線電波頻帶資源更顯壅擠，密集的行動裝置使得不同系統間，彼此互相干擾的機會大增，但是抵抗干擾的解決方案往往會提高行動裝置傳送端的功率損耗，尤其是在面對同頻干擾時；然而，為了使裝置微型化、輕量化至可隨身穿戴，行動裝置的能量來源：電池，卻也是另一項限制條件。這種兩害權衡的問題，在醫療用的人體區域網路設備上更加嚴重，為了符合醫學量測的需求與法規，這類設備的體積要更小、單次充電後的使用週期要更長、最大發送功率要更低，這些條件在在都顯示穿戴型設備的傳送端沒有多餘的能量來改善干擾所造成的問題。

本研究從訊號調變/解調變的方法與無線通訊通道的特性來分析訊號干擾的成因與可能的解決方法，進而提出一種新的頻率解調變技術來協助接收端在遭遇高功率同頻干擾的同時，能分辨正確訊號的資料內容，由於分辨訊號的參考特性來自於非人為的環境因素，因此即便完全遵照統一的通訊標準協定與法規，亦不會因為干擾訊號與正確訊號擁有相似的人為訊號調變特性而使抗干擾能力大打折扣。由於解調變的機制有別以往，本研究更針對這種新的頻率解調變技術設計功率控制機制，兩相搭配的模擬實驗結果發現，當同頻干擾訊號的調變方法與目標訊號相同時，可以保證訊號干擾比( Signal-to-Interference Ratio, SIR ) 在-30dB 至20dB 之間皆擁有10% 以下的位元錯誤率( Bit Error Rate, BER ) ，同時功率控制的機制不會讓傳送端追隨干擾訊號持續提高傳送功率而耗費多餘的能源來抵抗干擾。這兩大特性協助極低發送功率的個人無線通訊系統發送端不再需要浪費大半能量來處理干擾的問題，且系統本身並不需要發送任何控制命令來抑制干擾源的發送，這使得個人裝置的獨立性更高、使用時間更長、隱私與安全性也更好。

Nowadays the increase in the use of mobile devices has greatly raised the probability of mutual interference between different communication systems. Mechanisms that resolve mutual interference usually result in more energy consumption of the mobile devices involved, especially in the case of co-channel interferences. On the other hand, the trend of miniaturizing the mobile devices and making them light enough to be wearable restricts the size of their power sources; as the result, minimizing power consumption becomes essential for prolonging the operation of such devices. Therefore, it is important to develop an interference rejection mechanism that does not cause excessive power consumption.

Based on the characteristics of the wireless communication channel and the causes interferences, in this thesis we propose a new frequency demodulation technique and a new power control mechanism that together allow the receivers to distinguish high-power interferences from the signals intended to be received, even when the interferences have similar artificial characteristics with those of the intended signals. The proposed technique is implemented in a simulation programs. The simulation results show that, by the proposed technique, even when the co-channel interferences have the same modulation characteristics with the intended signals, the bit error rate ( BER ) can remain less than 10% if the signal-to-interference ratio ( SIR ) is between -30dB to 20dB. At the same time, the power consumption remains low and it is not necessary to increase transmitting power level to resist the interferences. By minimizing power consumption on resisting interferences, this ”lower-power interference rejection” technique allows personal mobile devices which have small power sources to have longer operational periods. In addition to power saving, the proposed technique does not require the base station to transmit power level control signals to the mobile devices ( for suppressing interferences ) . This characteristic allows the personal devices to have greater independence, longer life cycle, better privacy, and security.

審定書　i
誌謝　ii
中文摘要　iv
英文摘要　v
目錄　vi
圖次　x
表次　xv

第一章 緒論...........................................1
1.1 研究背景..........................................1
1.2 研究動機..........................................4
1.3 研究目的..........................................6
1.4 論文大綱與研究貢獻................................7

第二章 背景知識與文獻回顧.............................9
2.1 人體感測網路簡介..................................9
2.2 無線通訊系統的調變與解調變方法...................16
2.3 無線通訊系統的多重存取技術.......................30
2.4 通訊通道的理論模型...............................39
2.5 無線通訊系統的功率控制及其分類...................61

第三章 人體感測網路模型與功率控制演算法..............71
3.1 人體感測網路模型.................................71
3.2 功率追蹤式解調變技術.............................75
3.3 功率控制演算法...................................91

第四章 離散事件模擬與模擬程式........................97
4.1 離散事件模擬.....................................97
4.2 模擬程式........................................103

第五章 模擬實驗.....................................111
5.1 模擬實驗流程簡介................................111
5.2 實驗一：頻率調變的定功率干擾....................113
5.3 實驗二：頻率調變的變功率干擾....................120
5.4 實驗三：應用功率控制於頻率調變的定功率干擾......126
5.5 實驗四：應用功率控制於頻率調變的變功率干擾......132
5.6 實驗五：相位調變的定功率干擾....................138
5.7 實驗六：應用功率控制於相位調變的定功率干擾......144

第六章 結論與未來展望...............................151
6.1 結論............................................151
6.2 未來展望........................................153

參考文獻............................................154

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