利用MLBD來調解多重調變係數CPFSK之性能分析

Performance Analysis of Noncoherent Demodulated Multi-h CPFSK with MLBD

楊新雄(Richard Hsin-Hsyong Yang) ； 陳俊達(Jun-Da Chen)

《大葉學報》 10卷1期 (2001/06) Pp. 87-92

https://doi.org/10.7119/JDYU.200106.0087

摘要

在本文中，我們將最大相似區塊檢測（maximum likelihood block detection, MLBD）的技術推廣至非同調多重調變係數CPFSK（continuous phase frequency shift keying）。我們以解析方法針對不同的多重調變係數碼來推導出在AWGN（additional white gaussian noise）通道下之誤碼率，並驗證了電腦模擬與解析方法有相當近似的結果。一般而言，由於多重調變係數信號的最小歐式（euclidean）距離比MSK（minimum shift keying）來的大，因此多重調變係數CPFSK的同調解調在性能上會比MSK 好6 dB。由本論文的結果顯示，多重調變係數CPFSK 利用最大相似區塊檢測來解調，在性能上會勝過MSK達2 dB，且當誤碼率為Pb=10^(-5)時，最大相似區塊檢測會比one-bit 相差解調好上3到4 dB。我們並經由電腦模擬來得到兩組多重調變係數CPFSK在平坦拉瑞衰減通道（flat rayleigh fading channels）下之最大相似區塊檢測解調的誤碼率。

關鍵字

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

並列摘要

In this study maximum likelihood block detection (MLBD) techniques are generalized to noncoherent multi-h CPFSK (continuous phase frequency shift keying). Analytical results of the BER (bit error rate) are given for various multi-h codes in AWGN (additional white gaussian noise) channels. The results are in excellent agreement with the simulations. In general, because the minimum Euclidean distance of a multi-h signal is larger than an MSK (minimum shift keying) signal, the performance of a multi-h CPFSK using coherent detection is better than an MSK signal at 6 dB. It is demonstrated that multi-h CPFSK using the MLBD approach outperforms an MSK for 2 dB and performs better than one-bit differential detection at 3 to 4 dB at Pb=10^(-5). The BERs for two cases of multi-h CPFSK with MLBD in a flat Rayleigh fading channel are obtained by computer simulations.

並列關鍵字

maximum likelihood block detection ； multi-h CPFSK ； bit error rate ； flat Rayleigh fading channel