本論文主要研究快跳頻展頻系統結合移頻鍵移(FSK)信號之非同調檢測。兩種通道環境將被討論:第一種是多波道單音干擾(MTJ)的環境，另外一種則是跳頻多址進接(FHMA)的環境。
　　首先針對多波道單音干擾的通道環境，對於快跳頻展頻系統結合移頻鍵移信號在萊斯(Rician)衰落通道與高斯雜訊的環境下，我們提出通用的位元誤碼率理論分析架構。論文裡分別考慮n=1-band MTJ與independent MTJ兩種多波道單音干擾模式並分別對於ratio-statistic combining, product combining與 self-normalized combining三種分集結合方法進行研究與分析。我們推導通用的機率密度函數(PDF)與累積分布函數(CDF) ，這些通用函數可被運用於各種分集結合方法以獲得其理論分析。根據這些統計函數，我們可以求得各種分集結合方法對抗多波道單音干擾的位元誤碼率之系統性能。經由模擬驗證過的理論分析結果得知，在固定位元能量的假設下：1) 期望信號所遭受到衰落對於最差位元誤碼率的影響比較明顯，而多波道單音干擾所遭受到衰落對於系統性能的影響較不顯著。2)不同於先前文獻中所提出的結果，對於採用product combining與self-normalized combining之接收機，independent 多波道單音干擾模式比n=1-band干擾模式對於通訊系統具有較佳的干擾能力。
　　對於跳頻多址進接結合複頻鍵移(MFSK)信號之系統，在跳頻多址進接的通道環境下，根據遞迴式干擾消去(iterative interference cancellation)的觀念，我們提出一種新的多用戶檢測(multi-user detection)方法。多用戶檢測接收機的第一級採用soft-limited分集結合(近似最大可能性)方法而第二級嘗試利用已檢測出其他用戶符號來消除多址進接干擾。根據模擬的結果得知，我們提出的遞迴式干擾消去方法操作在瑞雷(Rayleigh)衰落通道下比原來的演算法提供約20%使用者容量的增加。

　　This thesis intend to investigate the fast frequency-hopped spread-spectrum (FFH/SS) systems combined with noncoherent detection of frequency-shift-keyed (FSK) signals. Two cases of communication channels are considered, one is a jammed channel in which the multitone jamming (MTJ) is present and the other is the frequency-hopped multiple access (FHMA) channels.
　　For the first class of channels, we establishes an analytical framework of the bit error probability (BEP) for an FFH/SS system in conjunction with binary FSK signal over Rician fading channels in presence of MTJ and additive white Gaussian noise (AWGN). Two types of MTJ models, namely n = 1-band MTJ and independent MTJ, are taken into account. Three types of diversity combining schemes, called ratio-statistic combining, product combining, and self-normalized combining, are applied and analyzed. We derive the general expressions of probability density functions (PDFs) and cumulative distribution functions (CDFs) of random variable z, which can be applied to perform theoretical analysis for each diversity combining receiver. According to these statistic functions, the BEP performance of a specific diversity combining receiver against MTJ is then evaluated. These analytical results, verified by simulations, show that under constant bit energy assumption: 1) the worst-case BEP performance of each diversity combining receiver is sensitive to the fading effect on the desired signal, but is insensitive to that on the jamming tones. 2) unlike the well-known knowledge, independent MTJ is more harmful than n = 1-band MTJ for both product combining and self-normalized combining receivers as the diversity level L≧2.
　　For the second class of channels, we propose a novel multiuser detection scheme based on iterative interference cancellation (IIC) concerning the FHMA system using multilevel FSK (MFSK) signals. A soft-limited combining (near maximum likelihood) receiver is employed in the first stage of the detector while the second stage attempts to remove the multiple access interferences produced from the other users. According to the simulation results, our proposed IIC method can offer about 20% capacity improvement when compared with the original IIC algorithm.

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