題目：A Unified Construction of Perfect (or CAZAC) Roots-of-Unity Sequences and Their Application to Low-PAPR Channel Sounding
主講人：Wai Ho Mow,Ph.D(Hong Kong University of Science and Technology)
時間：101年01月16日 (星期一15:30~)
地點：三峽校區社科大樓社1F06教室
Abstract:
Perfect Roots-of-Unity Sequences, sometimes called the Constant Amplitude Zero Auto Correlation (CAZAC) sequences, are defined by the property of having a perfect impulse like perodic autocorrelation function. As combinatoric objects, they are equivalent to the class of circulant Hadamard matrices with elements being some complex roots of unity. As their well-known special cases, the Frank and Chu sequences have been adopted as radar/ranging codes, synchronization preambles, as well as channel sounding sequences. A large number of constructions of such sequences have been discovered and rediscovered for a wide range of applications in the past. In this talk, I shall present a closed-form unified construction for such sequences. The result allows those CAZAC sequences that best satisfy a given application-specific requirements to be searched more efficiently. As an application example, I shall present of how the CAZAC-based sounding sequences with low peak-to-average-power ratios suitable for OFDM-based wireless systems (e.g. IEEE802.22) can be efficiently obtained.
Biography:
Wai Ho MOW received his MPhil and PhD degrees in Information Engineering from the Chinese University of Hong Kong. He was a visiting research fellow at the University of Waterloo in Canada, the Munich University of Technology (TUM) in Germany, and the Kyoto University in Japan in 1995, 1996 and early 2000, respectively. From 1997 to 1999 , he was an assistant professor at the Nanyang Technological University, Singapore. He has been with the Hong Kong University of Science and Technology since 2000. He was the recipient of 7 research/exchange fellowships from 5 countries, including the Humboldt Fellowship. His research interests are in the areas of wireless communications, coding and information theory. He pioneered the lattice approach to signal detection problems (such as sphere decoding and complex lattice reduction aided detection) and unified all known constructions of perfect roots-of-unity sequences (widely used as CAZAC preambles and radar signals). Since Jun 2002, he has been the principal investigator of over 10 funded research projects. He published 1 book, and co-authored over 20 filed patent applications and over 150 technical publications, among which he is the sole author of over 40. He co-authored a paper that received the ISITA2002 Paper Award for Young Researchers. He was a past chair of the Hong Kong Chapter of the IEEE Information Theory Society. He was a technical program co-chair of 5 conferences and served the technical program committees of many conferences such as Globecom, ICC, ISITA, ITW, VTC and WCNC. He served as the guest associate editor for 3 special issues of the IEICE Transactions on Fundamentals. He was a member of the Radio Spectrum Advisory Committee, Office of the Telecommunications Authority, the Hong Kong S.A.R. Government from 2003 to 2008.
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