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New Construction Method for Quaternary Aperiodic, Periodic, and Z-Complementary Sequence Sets
Zeng, Fanxin,Zeng, Xiaoping,Zhang, Zhenyu,Zeng, Xiangyong,Xuan, Guixin,Xiao, Lingna The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.3
Based on the known binary sequence sets and Gray mapping, a new method for constructing quaternary sequence sets is presented and the resulting sequence sets' properties are investigated. As three direct applications of the proposed method, when we choose the binary aperiodic, periodic, and Z-complementary sequence sets as the known binary sequence sets, the resultant quaternary sequence sets are the quaternary aperiodic, periodic, and Z-complementary sequence sets, respectively. In comparison with themethod proposed by Jang et al., the new method can cope with either both the aperiodic and periodic cases or both even and odd lengths of sub-sequences, whereas the former is only fit for the periodic case with even length of sub-sequences. As a consequence, by both our and Jang et al.'s methods, an arbitrary binary aperiodic, periodic, or Z-complementary sequence set can be transformed into a quaternary one no matter its length of sub-sequences is odd or even. Finally, a table on the existing quaternary periodic complementary sequence sets is given as well.
Improved Channel Estimation Algorithms based on a Proposed Signal Model for PUCCH Format 3 in LTE-A
Xiaoping Zeng,Ya Wen,Zhiming Wang,Yuemei Jin 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1
SORTD (Space Orthogonal-Resource Transmit Diversity) has already become a better way of transmit diversity for PUCCH format 3 in LTE-A [1]. SORTD technology lies in the characteristic that each antenna port transmits signal by using different cyclic shift [2] to make orthogonal each other. Using the SORTD’s feature of incoherence in different antennas, this paper proposes a special form of signal model. Based on this proposed model, we propose a low complexity channel estimator based on LS and cubic spline interpolation, and then we put a LS and DCT algorithm to improve the interpolation performance. Finally, for more accurate estimator we drive the third approach based on MMSE and DCT. A series of theoretical researches and simulation results show that all of them are suitable for the proposed signal model even in the environment of high-speed movement; especially the algorithms with DCT have a better performance.
Xiaoping Zeng,Yu Zhou,Xin Jian,Jie Huang,Jing Li 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
This paper derives the analytical expression of the temporal autocorrelation function (ACF) of the non-stationary three dimensional (3D) multipath scattering channels, in which scatterers move with constant velocities in random directions around transceivers. The analytical expression involves high dimensional integration within finite interval, thus a methodology based on ray-tracing is proposed to carry out its numerical solution. The analytical expression and the corresponding ray-tracing based model serve as the canonical forms for the correlation analysis of non-stationary 3D multipath scattering channels, which include two special cases: two dimensional (2D) multipath scattering and stationary multipath scattering. Numerical results show that: in case of non-stationary 3D multipath scattering, with the increase of the velocity and the density of scatterers, the temporal ACF would attenuate more rapidly. These results would allow engineers more appropriate determination on coherence time and coherence bandwidth for vehicle-to-vehicle communication systems.
Zeng, Fanxin,Zeng, Xiaoping,Xiao, Lingna,Zhang, Zhenyu,Xuan, Guixin The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
Based on an interleaving technique and quadriphase periodic complementary sequence (CS) mates, this paper presents a method for constructing a family of 16-quadrature amplitude modulation (QAM) periodic CS mates. The resulting mates arise from the conversion of quadriphase periodic CS mates, and the period of the former is twice as long as that of the latter. In addition, based on the existing binary periodic CS mates, a table on the existence of the proposed 16-QAM periodic CS mates is given. Furthermore, the proposed method can also transform a mutually orthogonal (MO) quadriphase CS set into an MO 16-QAM CS set. Finally, three examples are given to demonstrate the validity of the proposed method.
Fanxin Zeng,Xiaoping Zeng,Lingna Xiao,Zhenyu Zhang,Guixin Xuan 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
Based on an interleaving technique and quadriphase periodiccomplementary sequence (CS) mates, this paper presents amethod for constructing a family of 16-quadrature amplitudemodulation(QAM) periodic CS mates. The resulting mates arise fromthe conversion of quadriphase periodic CS mates, and the period ofthe former is twice as long as that of the latter. In addition, basedon the existing binary periodic CS mates, a table on the existenceof the proposed 16-QAM periodic CS mates is given. Furthermore,the proposed method can also transform a mutually orthogonal(MO) quadriphase CS set into an MO 16-QAM CS set. Finally,three examples are given to demonstrate the validity of the proposedmethod.
New Construction Method for Quaternary Aperiodic, Periodic, and Z-Complementary Sequence Sets
Fanxin Zeng,Xiaoping Zeng,Zhenyu Zhang,Xiangyong Zeng,Guixin Xuan,Lingna Xiao 한국통신학회 2012 Journal of communications and networks Vol.14 No.3
Based on the known binary sequence sets and Gray mapping,a new method for constructing quaternary sequence sets is presented and the resulting sequence sets’ properties are investigated. As three direct applications of the proposed method, when we choose the binary aperiodic, periodic, and Z-complementary sequence sets as the known binary sequence sets, the resultant quaternary sequence sets are the quaternary aperiodic, periodic, and Z-complementary sequence sets, respectively. In comparison with themethod proposed by Jang et al., the new method can cope with either both the aperiodic and periodic cases or both even and odd lengths of sub-sequences, whereas the former is only fit for the periodic case with even length of sub-sequences. As a consequence,by both our and Jang et al.’s methods, an arbitrary binary aperiodic,periodic, or Z-complementary sequence set can be transformed into a quaternary one no matter its length of sub-sequences is odd or even. Finally, a table on the existing quaternary periodic complementary sequence sets is given as well.
( Peng Zeng ),( Xiaoping Sun ),( Tianbin Li ),( Tianlong Zhang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Due to large uncertainties embedded in the geotechnical parameters, dynamic numerical model can hardly be applied to directly provide an accurate prediction for landslide run-out distance. Therefore, it is important to quantify these uncertainties to improve the reliability of the prediction. In this study, a probabilistic method is proposed to assess the exceedance probability of landslide run-out distance using a depth-averaged model encoded in Massflow and a response surface method (RSM)-based reliability method. Two rheological parameters (i.e., the friction angle and the pore pressure ratio) are considered as random variables. The limit state function (LSF) is established based on a given threshold value of the run-out distance (e.g., the distance from a building to the landslide). The RSM is then adopted to establish an approximation to the original LSF. Finally, the first-order and the second-order reliability method (FORM/SORM) are conducted based on the RSM to calculate the probability of the run-out distance exceeding the given threshold value. The Shenzhen landslide occurred in 2015 is employed to illustrate the performance of the proposed method. Results show that our proposed method can successfully assess the exceedance probability of run-out distance with acceptable computational errors; and it significantly improves the computational efficiency compared with the direct Monte Carlo simulation. Moreover, SORM produces more accurate results than FORM, which implies that the LSF is somewhat highly nonlinear. In general, this study presents a practical procedure to enhance the probabilistic run-out prediction of landslides, and also provides a key information for quantitative landslide risk assessment.