用線性調(diào)頻信號(hào)調(diào)制解決碼間串?dāng)_問題
The solution to the inter-symbol interference with the LFM
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摘要: 該文提出用線性調(diào)頻信號(hào)調(diào)制的方法解決碼間串?dāng)_的問題。為了與其它調(diào)制方法進(jìn)行對(duì)比，分別從公式推導(dǎo)和誤碼率兩方面進(jìn)行討論，并給出仿真結(jié)果。理論推導(dǎo)和實(shí)際仿真結(jié)果都表明，利用線性調(diào)頻信號(hào)進(jìn)行調(diào)制，可以很好的抑制碼間串?dāng)_。在惡劣的環(huán)境中(平均多徑時(shí)延較大)仍然可以保持較高的傳輸速率。線性調(diào)頻調(diào)制技術(shù)的優(yōu)點(diǎn)是：不需在接收端添加均衡濾波器，也不須進(jìn)行擴(kuò)頻編碼。
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關(guān)鍵詞:
- 線性調(diào)頻信號(hào); 壓縮比; 碼間串?dāng)_; 誤碼率
Abstract: The technique of the Linear Frequency Modulation(LFM) is proposed to solve the problems of the inter-symbol interference in this paper. For comparing with other modulation techniques, the BER is analyzed, and the simulation results are given. The theoretical prediction and the simulation results indicate that the LFM is very useful to depress the inter-symbol interference. The high transmitting speed is held in some areas where the average of the multi-path time dispersion is larger. The merits of the LFM are that it is not necessary to have an equalizer or the spread spectrum code modulation. -
T.S. Rappaport, Wireless Communications Principles and Practice, Prentice-Hall, Inc., 1996,Chapter 5.S.G. Wilson, Digital Modulation and Coding, Prentice-Hall, Inc., 1996, Chapter 3.[2]蔣同澤,現(xiàn)代移動(dòng)通訊系統(tǒng),北京,電子工業(yè)出版社,1994,7,第二章.[3]曹志剛,錢亞生,現(xiàn)代通訊原理,北京,清華大學(xué)出版社,1992,8,第九章.[4]J.C. Curlander.[J].R. N. Mcdonough, Synthetic Aperture RADAR Systems and Signal Processing,Newyork, JOHN WILEY SONS, INC.1991,:- -
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