軟體無線電架構下之GMSK調變解調系統

Burst Mode GMSK Modulation and Demodulation Based on Software Radio

丁竑睿(Hung-Jua Ting)

指導教授 ： 陳逸民 ； 劉嘉亮

元智大學/工程學院/電機與資訊工程研究所/碩士(1998年)

摘要

本論文中我們模擬GSM碼框式的0.3 GMSK訊號，以數位訊號處理的方式，研究其調變器的設計及同調解調器演算法分析與實作。同調解調器中所需要的時脈重建及相位重建可以利用每個碼框中的探測序列來輔助完成，並分析時脈重建與Viterbi等化器整合之接收機性能；接著利用Feedforward架構的時脈同步方式進行接收機性能分析，這種架構可在萊氏衰落通道中成功的運作；最後將時脈重建及相位重建演算法用MATLAB進行演算法定點運算模擬，並實現在TMS320C6X上。

關鍵字

軟體無線電 ； 時脈重建 ； 相位重建 ； 數位訊號處理晶片

並列摘要

In this thesis, we simulate GSM burst mode 0.3GMSK signal with Matlab program, implement the modulator and study the coherent demodulation algorithm in fixed point DSP chip. We use the training sequence in every burst to aid the timing synchronization and phase recovery. Also simulate the receiver performance of timing synchronization and Viterbi equalizer. In order to recovery the timing in fading channel, we use the feedforward demodulation. Finally, In order to implement the modulation and coherent demodulation algorithm in TMS320C6X, we simulate the 16-bit fixed-point format arithmetic in Matlab program and study the feasibility of implementation.

並列關鍵字

Software Radio ； Timing Recovery ； Phase Recovery ； DSP Processor

參考文獻

[3] Joe Mitola, "The Software Radio Architecture," IEEE Communication Magazine, pp. 26-38, May 1995.

[4] Kazuaki Murota, "GMSK Modulation for Digital Mobile Radio Telephony," IEEE trans., Vol. COM-29, NO. 7, July 1981.

[5] Ralf Mehlan, Yong-En Chen, and Heinrich Myer, "A Fully Digital Feedforward MSK Demodulator with Joint Frequency Offset and Symbol Timing Estimation for Burst Mode Mobile Radio," IEEE trans. on Vehicular Technology, Vol. 42, no. 4, November 1993.

[7] Boaz Porat, A Course in Digital Signal Processing, Wiley, 1997.

[8] Michele Morelli, Umberto Mengali, "Joint Phase and Timing Recovery With CPM Signals," IEEE, vol. 45 . no. 7, July 1997.