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| 1 | A wireless secret key generation method based on Chinese remainder theorem in FDD systems显示文摘The wireless physical channel parameters are recently used to provide secret key.However,the key generation usually suffers from the quantization errors due to the noise,which decreases the key agreement ratio (KAR) between authorized users.Most existing approaches achieve high KAR by discarding some channel parameters which may lower the key generation efficiency and therefore lower the encryption strength.In the frequency-division duplex (FDD) systems,the number of reciprocal parameters,such as the multipath angle and delay,is limited.Therefore how to find a quantization method with high KAR and encryption strength is one of the major problems for secret key generation in FDD systems.In this paper,a robust quantization scheme based on grouping and shifting is proposed,in which all the available parameters are used for key generation.In addition,a key mapping method with error correction based on Chinese remainder theorem (CRT) is proposed to further improve the KAR performance.Simulations demonstrate the effectiveness of the proposed method. | WANG WenJie JIANG HongYan XIA XiangGen MU PengCheng YIN QinYe | 2012 | Science China(Information Sciences)2012，55，7： | 5 |
| 2 | Phase detection based range estimation with a dual-band robust Chinese remainder theorem显示文摘Range estimation with multifrequency phases is a common practice in localization systems.The challenge of this method is the phase ambiguity.Some Chinese remainder theorem(CRT)based phase unwrapping algorithms have been proposed to solve the problem,where the wavelengths of the multifrequency signals need to be pair-wisely co-prime after they are divided by their greatest common divisor(gcd).This condition may limit the application in practice.In this paper,a novel way based on a dual-band robust CRT is presented to reconstruct the distance from dual-band wrapped phases,where the pair-wisely co-prime condition is not necessarily needed.As more wrapped phases are involved to reconstruct the distance,the method can significantly enlarge the reconstruction range compared to the single band solution. | YANG Bin WANG WenJie XIA XiangGen YIN QinYe | 2014 | Science China(Information Sciences)2014，57，2： | 4 |
| 3 | Comparison of parametric sparse recovery methods for ISAR image formation显示文摘A parametric sparse representation model of the inverse synthetic aperture radar(ISAR)signal has been proposed recently,and the ISAR signal is decomposed as a summation of many basis-signals determined by the target rotation rate.Based on the parametric sparse representation model,several sparsity-driven algorithms are proposed to retrieve both the target rotation rate and the ISAR image.In this paper,four parametric sparse recovery algorithms are compared mainly in three aspects:the accuracy of the rotation rate estimation,the ISAR image quality and the computational load.Numerical examples are presented to show the advantages and disadvantages for each method. | RAO Wei LI Gang WANG XiQin XIA XiangGen | 2014 | Science China(Information Sciences)2014，57，2： | 4 |
| 4 | Asynchronous cooperative communication systems:A survey on signal designs显示文摘Cooperative communications is a promising technique for future high speed wireless communications.These systems may be formulated as virtual multi-input multi-output (MIMO) systems where spatial/cooperetive diversity is a key advantage. However,different from MIMO systems,one of the major chal- lenges for cooperative communications systems is that the cooperative transmissions in cooperative systems may be neither time nor frequency synchronized,since the transmissions are from multiple cooperative nodes at different locations.The existing signal designs for co-located MIMO systems may not be able to collect the cooperative diversity in cooperative communications systems.This paper gives an overview of recent research efforts on combating the time and frequency asynchronism of the cooperative communication network.We focus on the signal designs (or space-time codings/modulations) to achieve full cooperative diversity,and summarize some of the resent distributed space-timing coding and space-frequency coding techniques to combat timing errors and frequency offsets,and in the meantime to achieve full cooperative diversity,in both one-way and two-way cooperative networks. | WANG HuiMing 1,2 & XIA XiangGen 3 1 School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049,China 2 State Key Laboratory of Integrated Services Networks, Xidian University,Xi’an 710049, China 3 Department of Electrical and Computer Engineering,University of Delaware,Newark,DE 19716,USA | 2011 | Science China(Information Sciences)2011，54，8： | 3 |
| 5 | Cyclic delay transmission for unique word OFDM systems显示文摘In this article,we propose a cyclic delay diversity(CDD)transmission scheme for unique word(UW)OFDM system,which is denoted as CDD-UW-OFDM.In our proposed CDD-UW-OFDM system,the first transmit antenna transmits a UW-OFDM and then,for every UW-OFDM block,the i-th transmit antenna transmits a cyclically delayed version of the symbols transmitted at the first transmit antenna.With this proposed CDD-OFDM system,each antenna transmission is a UW-OFDM.Also,at the receiver under a certain condition on the cyclic delay amounts,the received signal is equivalent to that of a single transmit antenna UW-OFDM transmission with a longer multipath channel.We design the lengths of UW and cyclic delays to achieve the full multipath and spatial diversities for the CDD-UW-OFDM system when the linear MMSE receiver is used.We then present some simulation results to illustrate the claimed performance of the proposed system. | LIAO Mang XIA XiangGen ZHANG YouGuang | 2014 | Science China(Information Sciences)2014，57，8： | 3 |
| 6 | Dualspeed SAR imaging of moving targets 显示文摘 | WANG Genyuan XIA Xianggen CHEN V C | 2006 | IEEE Trans on AES2006，42，1： | 1 |
| 7 | Efficient Progressive Edge-Growth Algorithm Based on Chinees Remainder Theorem显示文摘 | Jiang Xueqin Xia Xianggen | 2014 | IEEE Transactions on Communications2014，62，2： | 1 |
| 8 | A distributed differentially encoded OFDM scheme for asynchronous cooperative systems with low probability of interception 显示文摘 | LI Zheng XIA Xianggen | 2009 | IEEE Transactions on Wireless Communications2009，8，7： | 1 |
| 9 | Discrete chirp-fourier transform and its application to chirp rate estimation显示文摘 | Xia Xianggen | 2000 | IEEE Trans2000，48，11： | 1 |
| 10 | A distributed differentially encoded OFDM scheme for asynchronous cooperative systems with low probability of interception 显示文摘 | Li Zheng Xia Xianggen | 2009 | IEEE Transactions on Wireless Communications2009，8，7： | 1 |
| 11 | Simple Iterative Methods to Exploit the Signal-Space Diversity显示文摘 | LI Yabo XIA Xianggen WANG Genyuan | 2005 | IEEE Trans Commun2005，53，1： | 1 |
| 12 | A simple Alamouti space-time transmission scheme for asyaehronous cooperative systems显示文摘 | LI Zheng XIA Xianggen | 2007 | IEEE Signal Process- ing Letters2007，14，11： | 1 |
| 13 | Phase Unwrapping and a Robust Chinese Remainder Theorem 显示文摘 | XIA Xianggen WANG Genyuan | 2007 | IEEE Signal Processing Letters2007，14，4： | 1 |
| 14 | A Fast Robust Chinese Remainder Theorem Based Phase Unwrapping Algorithm 显示文摘 | LI Xiaowei XIA Xianggen | 2008 | IEEE Signal Processing Letters2008，15，： | 1 |
| 15 | Upper bounds of rates of space-time block codes显示文摘 | Wang Haiquan Xia Xianggen | 2003 | IEEE Transactions on Information Theory2003，49，10： | 1 |
| 16 | Efficient progressive edge-growth algorithm based on Chinese remainder rheorem显示文摘 | JIANG Xueqin XIA Xianggen and LEE Moonho | 2014 | IEEE Transactions on Communi- cations2014，62，2： | 1 |
| 17 | On sampling theorem,wavelet and wavelet transforms显示文摘 | XIA XIANGGEN ZHANG ZHEN | 1993 | IEEE Trans Signal Process1993，41，12： | 1 |
| 18 | The theory and implementation of arbitrary-length linear - phase cosinemodulated filter bank 显示文摘 | GAO Xiqi HE Zhenya XIA Xianggen | 2000 | Signal Processing2000，80，： | 1 |
| 19 | System identification using chirp signals and time-variant filters in the joint time-frequency do- main显示文摘 | Xia Xianggen | 1997 | IEEE Transactions on Signal Processing1997，45，8： | 1 |
| 20 | A family of distributed space-time trellis codes with asynchronous cooper- ative diversity 显示文摘 | LI Yabo XIA Xianggen | 2007 | IEEE Transactions on Communi- cations2007，55，： | 1 |
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