臺灣博碩士論文加值系統

本論文使用數值計算系統的位元錯誤率，此系統為快速跳頻二位元頻率移鍵通訊系統，作用於非選擇性中上衰落通道。通道中加入單一頻帶最壞情況的多成音干擾，且干擾也作用於中上衰落通道，與信號遭受到的通道彼此獨立。接收端經解跳頻後，以每一個碼片區間的信號為單位作非同調平方律檢測，並且經過線性裁剪後將 個分集信號相加，其中 為一個位元區間的碼片數量。最後決策輸出。
在本論文裡固定信號能量與雜訊比( )，以裁剪位準 、中上分佈衰落值 、一個位元的跳頻碼片數量 等等當作參數，數值計算系統在不同的信號干擾比( )下的位元錯誤發生機率。
不同的裁剪位準其位元錯誤率隨著改變。例如固定 ，衰落值 的情況下，在約 時 之位元錯誤率優於 ， ，其中 為經過衰落通道後的信號功率。在約 時 之位元錯誤率優於 。當 時， 的錯誤率( )優於 的錯誤率( )優於 的錯誤率( )。

This thesis pertains to the numerical evaluation of bit error probability of the system which is an binary phase-shift keying (BPSK)/ fast frequency hopping spread spectrum communications. The system is assumed to be worked over frequency nonselective Nakagami-m fading channel. The transmitted signal is also assumed to be attacked by a one-band worst multi-tone jamming, which is assumed to experience frequency nonselective Nakagami-m fading. The Jamming channel is assumed to be statistically independent of that of the signal channel. At the receiver end, the noncoherent square-law demodulation is employed, which is then fed to a linear clipper. Finally, the decision maker will output an estimated data.
The signal energy-to-noise power spectrum density ( ) is fixed, and the clipping level C, the fading figure m, and the hopping number in one bit L are used as parameters. The numerical approach is adopted to evaluate bit error probability of such a system in a variety of signal-to-jamming ratio (SJR).
Bit error probability is significantly affected by the value of clipping level. For example, By fixing and fading figure , the bit error probability with is better than that with when , where and is the signal power, the bit error probability with is better than that with when , the bit error probability with is better than that with and the bit error probability with is better than that with when .

摘要 I
ABSTRACT II
目次 III
圖目錄 V
表目錄 VII
第一章 緒論 1
第一節 文獻探討 1
第二節 研究背景與動機 2
第三節 論文架構 2
第二章 展頻介紹 3
第一節 如隨機碼 4
第二節 直接序列展頻 7
第三節 跳頻展頻 9
第三章 衰落通道 13
第一節 通道傳輸 13
第二節 大尺度衰落 13
第三節 小尺度衰落 14
第四節 衰落通道之衰落模型 18
第四章 干擾介紹 23
第一節 部份頻帶干擾與全頻干擾 23
第二節 單成音干擾與多成音干擾 23
第三節 單一頻帶最壞情況之多成音干擾 24
第五章 系統模型 26
第一節 發射機模型 26
第二節、通道模型 27
第三節 接收機模型 29
第六章 位元錯誤率 35
第一節 四種機率密度函數 35
第二節 軟性限制之機率密度函數 37
第三節 平均位元錯誤率 38
第七章 數值結果與討論 41
第八章 結論與未來展望 48
第一節 結論 48
第二節 未來展望 48
參考文獻 49
附錄一 51
附錄二 53
附錄三 57
附錄四 60

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