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研究生:陳俊達
研究生(外文):Jun-Da Chen
論文名稱:非同調多重調變係數CPFSK之最大相似區塊檢測
論文名稱(外文):Maximum Likelihood Block Detection of Noncoherent Multi-h CPFSK
指導教授:楊新雄楊新雄引用關係
指導教授(外文):Hsin-Hsyong Richard Yang
學位類別:碩士
校院名稱:大葉大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:英文
論文頁數:66
中文關鍵詞:最大相似區塊檢測多重調變係數CPFSK誤碼率平坦拉瑞衰減通道
外文關鍵詞:maximum likelihood block detectionmulti-h CPFSKbit error rateflat Rayleigh fading channel
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在本論文中,我們利用最大可能性區塊檢測 ( MLBD ) 來解調非同調多重調變指數連續相位頻率位移鍵 ( Multi-h CPFSK ),同時考慮白色高斯雜訊與平坦拉瑞 ( Rayleigh ) 衰減通道。在正文中首先介紹最大可能性的機制,並推導出在白色高斯雜訊下,此檢測器的位元錯誤率。此非同調檢測器是由一排匹配濾波器所組成的,且這些匹配濾波器後面分別接著序列估測器。在白色高斯雜訊下,我們驗證了電腦模擬與理論值有相當接近的結果,並比較了四個訊符 ( symbols ) 觀察的最大可能性區塊檢測,最大可能性序列檢測 ( MLSD ) 以及一個位元的差分檢測 ( one-bit differential detection )。最大可能性區塊檢測比一個位元的差分檢測有大約3 dB 改善,且只有比最大可能性序列檢測有3-4 dB損失。我們也以電腦模擬了最大可能性區塊檢測經由平坦拉瑞衰減通道的情形。在慢速衰減通道下,最大可能性區塊檢測以三個訊符觀察的性能比兩個訊符觀察有1 dB的改善。當衰減變快時,兩個訊符觀察和三個訊符觀察皆會形成錯誤層( error floor ),而在高的訊噪比時,三個訊符觀察的性能會比兩個訊符觀察差。在平坦拉瑞衰減通道下,如果要讓位元錯誤率等於 0.001,則訊噪比約需要30 dB。所以,我們可以推斷最大可能性區塊檢測器在衰減通道下,多重調變指數信號是實際可行的。

In this thesis, we examine maximum likelihood block detection (MLBD) of noncoherent continuous phase frequency shift keying signals with periodic modulation indexes (Multi-h CPFSK) in AWGN and flat Rayleigh fading channels. First, the maximum likelihood metric is introduced, and the bit error probability of the detection algorithm in an AWGN channel is derived. The noncoherent detector is shown to consist of a bank of matched filters followed by a sequence estimator. In the AWGN channel, the simulation results are consistent with theoretical results, and demodulation using MLBD with a four-symbol observation is compared with MLSD and one-bit differential detection (DD). MLBD has about 3 dB improvements over 1-bit DD, and have no more than 3-4 dB loss than MLSD. The performance of MLBD in a flat Rayleigh fading channel are obtained by computer simulation. When in slowly fading case, it is interesting to note that the performance of a three-symbol observation has 1 dB improvement over a two-symbol observation. However, when fading becomes fast, both the two- and three-symbol observations form an error floor, and the performance of the three-symbol observation is worse than the two-symbol observation at a high SNR. In the flat Rayleigh fading channel, the SNR about 30 dB is required by MLBD to yield a bit error rate of 0.001. Hence, we can conclude that the modulation scheme using the multi-h signal can be a practical one in the fading channel when MLBD is applied.

Table of Contents
封面內頁
簽名頁
授權書.......................................................iii
摘要.........................................................iv
ABSTRACT.....................................................v
誌謝.........................................................vi
Table of Contents............................................vii
List of Figures..............................................ix
List of Tables...............................................xii
Chapter 1. Introduction.....................................1
1.1 Research Motive.........................................1
1.2 Outline of the Thesis...................................4
Chapter 2. Multi-h CPFSK Signal.............................6
2.1 CPFSK Signal............................................6
2.2 Multi-h Signal..........................................7
Chapter 3. MLBD Metric of Noncoherent Multi-h CPFSK Signal in an AWGN Channel..............................................12
3.1 Basic Structure.........................................12
3.2 Special Case — Binary CPFSK............................18
Chapter 4. BER for MLBD of Noncoherent Multi-h CPFSK Signal in an AWGN Channel...........................................20
4.1 Analytical Results......................................20
4.2 Special Case —M=2 , N=2 , H=2..........................23
Chapter 5. Simulation Results for MLBD in a Flat Rayleigh Fading Channel...............................................26
5.1 Results with an AWGN Channel............................26
5.2 Results with a Rayleigh Fading Channel..................36
Chapter 6. Conclusions and Future Work......................42
6.1 Conclusions and Discussions.............................42
6.2 Future Work.............................................43
References...................................................50
Appendix A. Evaluation of The Pairwise Error Probability....55
Appendix B. A Rayleigh Fading Channel.......................58
Appendix C. DS-CDMA System..................................64

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