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Blind Adaptive Channel Shortening and Frequency Domain Equalizations in Multipath Fading Channels
|關鍵字:||前置循環碼(CP);Cyclic prefix (CP);符號間干擾(ISI);通道縮減等化器(CSE);正交分頻多工(OFDM);分碼多工存取(CDMA);Inter-symbol interference (ISI);Channel-Shortening Equalizer (CSE);frequency-division multiplexing (OFDM);Code Division Multiple Access (CDMA)||出版社:||電機工程學系所||引用:||.R. D. J. van Nee, G. A. Awater, M. Morikura, H. Takanashi, M. A. Webster, and K. W. Halford, “New high-rate wireless LAN standards,” IEEE Commun. Mag., vol. 37, no. 12, pp. 82-88, Dec. 1999. .Air Interface for Fixed Broadband Wireless Access Systems, MAC and Additional PHY Specifications for 2-11 GHz, IEEE Std. 802.16a, 2003, Edition. .Digital Video Broadcasting (DVB); Framing Structure, Channel Coding and Modulation for Digital Terrestrial Television, ETSI EN 300 744 V1.4.1, 2001. .——Radio Broadcasting System, Digital Audio Broadcasting (DAB) to Mobile, Portible, and Fixed Receivers, ETS 300 401, 1995-1997. .D. H. Layer, “Digital radio takes to the road,” IEEE Spectrum, vol. 38, pp. 40-46, Jul. 2001. .D. D. Falconer, S. L. 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Cyclic prefix (CP) is widely used to communication systems, because it is useful and robust to cancel Inter-symbol interference (ISI). CP this technique it not only can cancel ISI, but also to reduce the channel with the Channel-Shortening Equalizer (CSE).
This technique CSE is using this way that the length of channel is equal with the length of CP the last CP subtract the last symbol will be zero. Follow this way if other CPs with other copy symbols subtraction also zero or minimum to zero, the channel is equal to one tap channel for the transmission data. Using this way demodulate the transmission data, we can use the sample (one tap) frequency-domain equalization to restore it.
And orthogonal frequency-division multiplexing (OFDM) and Code Division Multiple Access (CDMA) is a popular transmission format for emerging wireless communication systems, including satellite radio, various wireless local area network (LAN) standards, and digital broadcast television. So in this paper we also use the CSE in the DS-CDMA and the OFDM-CDMA system.
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