National Key Laboratory of Communication of UESTC

Chengdu, China

National Key Laboratory of Communication of UESTC

Chengdu, China

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Wang J.,National Key Laboratory of Communication of UESTC | Xiao Y.,Nanjing Southeast University | Li S.,National Key Laboratory of Communication of UESTC | Li L.,National Key Laboratory of Communication of UESTC | Zhang J.,National Key Laboratory of Communication of UESTC
International Conference on Communication Technology Proceedings, ICCT | Year: 2012

Multi-user MIMO downlink systems with one base station and many users have attracted the research attention. Precoding algorithms, which uses the channel state information (CSI) to process the transmit signal, have been used to pre-eliminate the spatial interference among different users. In this paper, we explore several precoding methods in the spatial modulation (SM) combined orthogonal frequency division multiplexing (SM-OFDM) to achieve good performance on a Long Term Evolution (LTE) channel. Channel inversion methods are introduced to SM scheme. Furthermore, we proposed a specified block diagonalization precoding method for this particular transmit antenna scheme. For assessment purposes, the performance results of SM-OFDM systems are compared with the popular Alamouti coded OFDM systems and vertical Bell Labs layered space-time (V-BLAST) OFDM systems. Simulation results show that SM based systems achieved better performance in some situations. © 2012 IEEE.


Yang L.,National Key Laboratory of Communication of UESTC | Song S.,National Key Laboratory of Communication of UESTC | Su W.W.,National Key Laboratory of Communication of UESTC | Wang Y.F.,National Key Laboratory of Communication of UESTC | Wen H.,National Key Laboratory of Communication of UESTC
Communications in Computer and Information Science | Year: 2011

LT codes are designed for the purpose of scalable and fault-tolerant distribution of data over wireless networks. This paper introduces the four design methods of LT codes degree distribution. Analyzing and comparison results of the short and long of LT code performance under the different channel probability are given, which show that in the case of large delete the probability, the original data packets can be recovered with high probability as long as the decoder receives a sufficient number of packets. The results of this paper will reference for system choose a different LT code parameters. © 2011 Springer-Verlag.


Liang Q.,National Key Laboratory of Communication of UESTC | Wen Q.,National Key Laboratory of Communication of UESTC | Xiao Y.,National Key Laboratory of Communication of UESTC | Li S.,National Key Laboratory of Communication of UESTC
Journal of Networks | Year: 2010

Signal to clipping noise ratio (SCR) and active-set methods are two existing methods for peak-to-average power ratio (PAPR) reduction based on tone reservation. In this paper, the computational complexities of these two methods are analyzed and simulation is done for comparing their PAPR-reducing performance. The simulation results show that active-set method requires less computational complexity than that of SCR method while they achieve similar PAPR reduction performance. © 2010 ACADEMY PUBLISHER.


Zhang G.Y.,National Key Laboratory of Communication of UESTC | Wen H.,National Key Laboratory of Communication of UESTC | Zhou L.,National Key Laboratory of Communication of UESTC | Yang L.,National Key Laboratory of Communication of UESTC | Wang Y.F.,National Key Laboratory of Communication of UESTC
Communications in Computer and Information Science | Year: 2011

As a kind of modulation with high degree of both power and bandwidth efficiency, Filtered QPSK (FQPSK) has been widely applied in the satellite and deep space communication. This paper first investigates the Maximum-A- Posteriori-Probability (MAP) demodulation of FQPSK-B. Then a serially concatenated system of FQPSK and LDPC codes is built, which gives both the advantages of LDPC codes and FQPSK and can easily be considered to save the power and spectral utilization ratio of the system. We demonstrate that the new concatenated system can achieve high power and spectral efficiency through extensive analysis and simulation. © 2011 Springer-Verlag.


Wen H.,National Key Laboratory of Communication of UESTC | Wen H.,University of Waterloo | Ho P.H.,University of Waterloo | Gong G.,University of Waterloo
Science in China, Series F: Information Sciences | Year: 2010

In this paper, we introduce a message physical layer assisted message authentication (PAA) framework under public key infrastructure (PKI) in vehicular communication networks. The proposed framework takes advantage of temporal and spatial uniqueness in physical layer channel responses for each transmission pair, in which a trust between two vehicles can be maintained by comparing the current estimated channel response and the previous estimated channel response. We will show that the proposed message authentication framework can achieve high efficiency and minimal authentication delay without compromising the security requirements, which is further verified through both analysis and simulation. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg.


Wen H.,National Key Laboratory of Communication of UESTC | Wen H.,University of Waterloo | Ho P.-H.,University of Waterloo
KSII Transactions on Internet and Information Systems | Year: 2011

In this paper, we introduce a novel Public Key Infrastructure (PKI) based message authentication scheme that takes advantage of temporal and spatial uniqueness in physical layer channel responses for each transmission pair in vehicular communication networks. The proposed scheme aims at achieving fast authentication and minimizing the packet transmission overhead without compromising the security requirements, in which most messages can be authenticated through an extreme fast physical-layer authentication mechanism. We will demonstrate that the proposed secure authentication scheme can achieve very short message delay and reduced communication overhead through extensive analysis and simulation. © @ 2011 KSII.

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