超寬頻(UWB)技術為短距離無線通訊系統中大有可為的方案之一。UWB最吸引人的特性為在低傳送功率下高速度傳輸能力(大於400 Mbps)。現今有兩種提案針對UWB實體層,分別為Motorola所支持的直接序列超寬頻(DS-UWB),其保留了原本UWB脈波的本質,與Intel所支持的多頻帶結合跳頻正交分頻多工超寬頻(Multi-band OFDM UWB)。
在本論文上，我們將首先介紹幾種針對直接序列超寬頻系統(DS-UWB)的脈波波形設計。另一方面，由於嚴重多重路徑所造成符號間彼此的干擾，我們必須設計出一個效能好的接收機。在這部份，我們將會根據DS-UWB系統封包格式來逐步進行同步、初步通道估計、訊框開始偵測、精確通道估計、犁耙接收機和等化器。最後我們將會在不同UWB通道模型下比較系統效能。

Ultra-Wideband (UWB) technology is one of the promising solutions for short-range indoor wireless communication applications. The attractive feature of the UWB communication systems is high communication capability (greater than 400 Mbps) with low transmission power. Now there are two proposals for UWB physical layer. One is DS-CDMA UWB proposed by Motorola, which preserves the original UWB pulses nature. The other is a Multi-band approach combining frequency hopping with Orthogonal Frequency Division Multiplexing (OFDM UWB) proposed by Intel.
In this thesis, we will first introduce some pulse waveforms design for DS-UWB system. On the other hand, we also design a robust receiver to combat ISI due to dense multipath. In this part, we will follow the packet format of DS-UWB system to introduce the process of synchronization, coarse channel estimation, SFD detection, fine channel estimation, rake receiver, and equalizer. Finally, we will compare the system performance under different UWB channel model.

[1]“Revision of Part 15 the Commission’s rules regarding ultra-wideband transmission systems,” FCC, ET Docket 98–153, 2002.
[2] IEEE P802.15-04/0137r4, January, 2005 “DS-UWB Physical Layer Submission to 802.15 Task Group 3a”
[3] M. Ghavami, L. B. Michael, R. Kohno. Ultra Wideband Signals and Systems IN Communication Engineering. John Wiley & Sons, Ltd
[4] B. Parr, B. L. Cho, K. Wallace, Z. Ding, “A Novel Ultra-Wideband Pulse Design Algorithm,” IEEE Commun. Letters, Vol. 7, No. 5, pp. 219-221, MAY. 2003
[5] A. B. Parr, B. L. Cho, Z. Ding, “A New UWB Pulse Generator for FCC Spectral Masks,” in Proc. ehicular Technology Conference, Vol. 3, pp. 1664-1666, Apr. 2003
[6] Zhendong Luo, Hong Gao, Yuanan Liu, Jinchun Gao ,” A new UWB pulse design method for narrowband interference suppression”, IEEE Communications Society Globecom 2004,Volume 6, 29 Nov.-3 Dec. 2004.
[7] Ryuji Kohno, Honggang Zhang, and Hiroyo Ogawa,“CRL-UWB Consortium’s Soft-Spectrum UWB PHY proposal for IEEE 802.15.3a”, IEEE P802.15-03/097r3, May 2003.
[8] Ryuji Kohno, Honggang Zhang, and Hiroyo Ogawa,“CRL-UWB Consortium’s Soft-Spectrum UWB PHY proposal update for IEEE 802.15.3a”, IEEE P802.15-03/097r5, July2003.
[9] Honggang Zhang, Kohno, R.,” SSA Realization in UWB Multiple Access Systems Based on Prolate Spheroidal Wave Functions”, 2004 IEEE Wireless Communications and Networking Conference, Volume 3, pp.21-25, March 2004.
[10] Li, Y.G., Molisch, A.F., Zhang, J., “Channel Estimation and Signal Detection for VUWB”, International Symposium on Wireless Personal Multimedia Communications (WPMC), October 2003
[11] Jinho Choi, Seong Rag Kim, Cheng-Chew Lim, “Receivers with chip-level decision feedback equalizer for CDMA downlink channels” 2004 IEEE Transactions on Wireless Communications, Volume 3, Issue 1, pp.300 – 314, Jan. 2004