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| 1 | A Novel Resource Allocation Algorithm based on Downlink and Uplink Decouple Access Scheme in Heterogeneous Networks显示文摘Traditional cellular network requires that a user equipment(UE) should associate to the same base station(BS) in both the downlink(DL) and the uplink(UL). Based on dual connectivity(DC) introduced in LTE-Advanced R12, DL/UL decouple access scheme has been proposed, which is especially suitable for heterogeneous networks(Het Nets). This paper is the pioneer to take the DL/UL decouple access scheme into consideration and develop a novel resource allocation algorithm in a two-tier Het Net to improve the total system throughput in the UL and ease the load imbalance between macro base stations(MBSs) and pico base stations(PBSs). A model is formulated as a nonlinear integer programming, and the proposed algorithm is a sub-optimal algorithm based on the graph theory. First, an undirected and weighted interference graph is obtained. Next, the users are grouped to let users with large mutual interferences to be assigned to different clusters. Then, the users in different clusters are allocated to different resource blocks(RBs) by using the Hungarian algorithm. Simulation results show that the proposed algorithm can provide great promotions for both the total system throughput and the average cell edge user throughput and successfully ease the load imbalance between MBSs and PBSs. | Laiwei Jiang Xuejun Sha Xuanli Wu Naitong Zhang | 2016 | China Communications2016，13，6： | 4 |
| 2 | Pulse shaping method to compensate for antenna distortion in ultra-wideband communications显示文摘In the ultra-wideband (UWB) communication systems, a critical spectral mask is released to restrict the allowable interference to other wireless devices by the Federal Communications Commission (FCC), and then some pulse shaping methods have been presented to fulfil the mask. However, most pulse shaping methods do not consider the antenna distortion which cannot be neglected in the UWB communication systems compared with the conventional systems. To this end, an orthogonal wavelet based pulse shaping method is proposed in this paper to integrate compensation of antenna distortion into pulse shaping. Simulation results show that the novel pulse shaping method can be used to achieve compensation for antenna distortion, optimization of transmission power spectrum, and simplification of the algorithm, as well as simple implementation of the pulse generator. | WU XuanLi SHAXueJun ZHANG NaiTong | 2007 | Science in China(Series F)2007，50，6： | 4 |
| 3 | High Capacity Spectrum Sensing Framework Based on Relay Cooperation显示文摘In order to reduce interference to primary users and provide better performance of detection probability and channel capacity in multi-user cooperative spectrum sensing networks, a high capacity spectrum sensing framework is proposed based on the analysis of amplification factors on the performance of detection probability and channel capacity. Thanks to the energy concentration property of chirp signals in the Fractional Fourier Transform(Fr FT) domain, sinusoidal signal and different chirp signals are utilized for primary user and cognitive users, respectively. Hence, spectrum sensing and signal transmission can be performed simultaneously in our proposed framework. Simulation results show that compared with the previous relay-based framework, the modified cooperative spectrum sensing framework can improve the detection probability significantly, and the channel capacity can also be improved. Moreover, the amplification factor can be used to realize the tradeoff between detection probability and channel capacity in our proposed framework. | Wu Xuanli Han Xingling Fabrice Labeau | 2016 | China Communications2016，13，8： | 1 |
| 4 | Influences of permeation of vanadium ions through PVDF-g-PSSA membranes on performances of vanadium redox flow batteries显示文摘 | Luo Xuanli Lu Zhengzhong Xi Jingyu Wu Zenghua Zhu Wentao Chen Liquan Qiu Xinping | 2005 | The Journal of Physical Chemistry B2005，109，20： | 1 |
| 5 | Method to calculate interior sound field of arbitrary-shaped closed thin shell显示文摘The concept of covering-domain means that an arbitrary-shaped closed shell can be approached by a series of closed spherical shells. Based on it, the interior scattering sound field of the arbitrary-shaped closed shell is given. According to the reciprocity theory, the radiating sound field of the elastic surface due to the action of external force is presented. The method presented can also be used to calculate the interior sound fields of arbitraryshaped closed thin shells of which the thickness are either equal or unequal. It is verilied to be correct by corresponding test. | WU Jiuhui,CHEN Hualing,HU Xuanli (Institute of Vibration & Noise Control Engineering, Xi’an Jiaotong University Xi’an 710049) | 2001 | Chinese Journal of Acoustics2001，20，1： | 0 |
| 6 | Fractional Fourier transform based transmitted reference scheme for UWB communications显示文摘In this paper,we propose a receiving system for impulse radio ultra-wideband (IR-UWB) communications,in which the data and reference pulses are combined as one signal to transmit,and the received signal can be divided into the data and reference pulses in the receiver end using the energy concentration property of Chirp pulses in fractional Fourier transform (FrFT) domain.A detailed theoretical analysis of the proposed system is given,and the formulation of bit error rate (BER) is obtained.Then according to the BER formulation,system performance of the proposed receiving system is compared with existing STR,DTR and ATR systems,considering timing-variance of IR-UWB channels as well as timing jitter at the transmitter.Results show that the proposed receiving system outperforms existing systems in most situations. | LIN Di WU XuanLi SHA XueJun | 2011 | Science China(Information Sciences)2011，54，8： | 0 |
| 7 | Load Distribution of Base Stations in User-Centric Heterogeneous UDN显示文摘In ultra-dense networks(UDN),multiple association can be regarded as a user-centric pattern in which a user can be served by multiple base stations(BSs).The data rate and quality of service can be improved.However,BSs in user-centric paradigm are required to serve more users due to this multiple association scheme.The improvement of system performance may be limited by the improving load of BSs.In this letter,we develope an analytical framework for the load distribution of BSs in heterogeneous user-centric UDN.Based on open loop power control(OLPC),a user-centric scheme is considered in which the clustered serving BSs can provide given signal to interference plus noise ratio(SINR)for any typical user.As for any BS in different tiers,by leveraging stochastic geometry,we derive the Probability Mass Function(PMF)of the number of the served users,the Cumulative Distribution Function(CDF)of total power consumption,and the CDF bounds of downlink sum data rate.The accuracy of the theoretical analysis is validated by numerical simulations,and the effect the system parameters on the load of BSs is also presented. | Xuanli Wu Xu Chen Ziyi Xie Wei Wu Tianzhu Pan Yong Li | 2023 | China Communications2023，20，9： | 0 |
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