Key Laboratory of Police Wireless Digital Communication

Security, China

Key Laboratory of Police Wireless Digital Communication

Security, China
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He C.-G.,Harbin Institute of Technology | He C.-G.,Key Laboratory of Police Wireless Digital Communication | Zhang K.-Y.,Harbin Institute of Technology | Gao Y.-L.,Harbin Institute of Technology | Liu C.-P.,Harbin Institute of Technology
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

As the rapid growth of the data traffic, the mobile cellular network is under unprecedented operation pressure. Various of small cells with relay technologies have been proposed to bypass increased data with the status of the limited base station so far. Therefore, vehicular small cell gradually are attracting the attention of the researchers. In this paper, we discuss the communication model of the vehicular user under the cellular network, including the direct transmission model in cellular network, the transmission model in vehicular small cell with fixed relay nodes (FRN) and the transmission model in vehicular crowdcell with mobile relay nodes (MRN). With considering the effect of the VPL, the paper analyzes the average energy consumption of the vehicular users in two-dimensional block environment which is subject to Rayleigh fading. Simulation and numerical results indicate that the MRN transmission model in vehicular crowdcell is significantly superior to the other two transmission model with the distance between the user and the base station under the same application. © 2016 IEEE.


Li X.,Harbin Institute of Technology | Li X.,Key Laboratory of Police Wireless Digital Communication | Lin M.,Harbin Institute of Technology | Lin M.,Key Laboratory of Police Wireless Digital Communication | And 3 more authors.
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

Device-to-Device (D2D) communication appears to be a promising component in 5G networks because of its increased spectral efficiency and reduced communication delay. But it also causes the co-channel interference to cellular networks. In this paper, we propose a new power control and resource scheduling scheme by taking into account the fairness, quality-of-service (QoS) requirements to deal with the issue of co-channel interference. The objective of our work is to maximize the sum of all users logarithmic utility functions. This is a NP-hard problem. We decomposed the optimization problem into two main subproblems. The first one is the problem of power control for a single D2D pair and its possible reuse candidates to maximize the overall throughput while ensuring signal-to-noise-and-interference (SINR) requirements of both D2D pair and its reuse candidates. The second one is the problem of Proportional Fair Scheduling (PFS) of resource for multiple D2D pairs and cellular users with a view to improving the system Fairness. We propose to use the Hungarian algorithm to address this issue. Simulation results showed that the proposed algorithm could significantly improve the system performance in terms of the system fairness and the overall system throughput while satisfying the QoS requirements of both D2D and cellular links. © 2016 IEEE.


Shu T.,Harbin Institute of Technology | Shu T.,Key Laboratory of Police Wireless Digital Communication | Lin M.,Harbin Institute of Technology | Lin M.,Key Laboratory of Police Wireless Digital Communication | And 2 more authors.
International Conference on Signal Processing Proceedings, ICSP | Year: 2017

As a significant step for vertical handover, optimal decision for network selection has been attracting high and sustaining attention over the past decade, especially on the topic of meeting user's rapidly increased requirements. However, the instability of the basic decisive parameters is ignored in most of the investigations, which might finally lead to a high misjudgement ratio. Therefore, great effort was made to dissect the relationship between misjudgement ratio and the volatility of parameters in this paper. Herein, quantitative analytical for single-parameter network selections and multi-parameter network selections based on linear algorithms was achieved and testified, and qualitative analytical for non-linear multiparameters algorithms was exemplified as well. The simulation results show that the proposed analytical method could depict the trends of misjudgement ratio. Especially, in the case of great amount attributes or obvious differences among the subnets, it exhibits excellent accuracy in the estimation of misjudgement ratio. © 2016 IEEE.


Liu C.-P.,Harbin Institute of Technology | He C.-G.,Harbin Institute of Technology | He C.-G.,Key Laboratory of Police Wireless Digital Communication | Meng W.-X.,Harbin Institute of Technology | And 2 more authors.
2016 IEEE Global Communications Conference, GLOBECOM 2016 - Proceedings | Year: 2016

This paper presents Multiple Radio Access Technologies(M-RATs) cooperative model for Device- to-Device (D2D) communications, which depends on both the licensed and unlicensed spectrum. The notion of cooperation factor is introduced to capture and analyze the threshold constraint in cooperation scenes. This paper also derives the coverage probability and link spectrum efficiency in typical RAT, which takes into consideration of cooperation factor, density of D2D users and pathloss exponent. Moreover, the metric of cooperation gain is proposed to depict the differences between cooperation with M-RATs and aggregation of multiple spectrum, which can be proved for a decreasing function of cooperation factor. Simulation and numerical results indicate that cooperation can bring higher link spectrum efficiency than that of the non-cooperation, according with the theoretical analysis perfectly. © 2016 IEEE.


Tang S.,Harbin Institute of Technology | Tang S.,Key Laboratory of Police Wireless Digital Communication | Ma L.,Harbin Institute of Technology | Ma L.,Key Laboratory of Police Wireless Digital Communication | And 2 more authors.
2016 IEEE Global Communications Conference, GLOBECOM 2016 - Proceedings | Year: 2016

Great efforts have been driven to improve the optimal decision for network selection, which is significant for vertical handover to meet user's rapidly increased requirements. Unfortunately, the instability of the basic decisive parameters is usually ignored, resulting in a high misjudgement ratio. Therefore, this paper proposed a novel parameter estimation algorithm to bridge the observed values and the inherent characters for the decisive parameters via Gaussian Hidden Markov Model. After trained by given parameter sequences in off-line phase, the parameter pre-estimated algorithm can reveal the parameters' inherent statuses in the on-line phase. Furthermore, the pre- estimated results can be regarded as normalized inputs for network selections. The simulation results show that the proposed algorithm could reduce the misjudgement ratio of the network selection algorithms, especially exhibiting a good performance for the low speed mobile users. © 2016 IEEE.


Tan X.,Harbin Institute of Technology | Tan X.,Key Laboratory of Police Wireless Digital Communication | Yin C.,Harbin Institute of Technology | Ma L.,Harbin Institute of Technology
2014 21st International Conference on Telecommunications, ICT 2014 | Year: 2014

In cognitive radio system, it is still a problem that resources scheduling is unfairness if secondary users (SUs) locate at the disadvantage position around the base station when spectrum aggregation technology is involved to support high speed data transmission. A positional proportional fairness scheduling is advised based on spectrum aggregation to solve this problem. This paper focuses on the relation between spectrum aggregation and unfairness of SUs caused by disadvantage position. Bandwidth fairness can be improved as much as possible after considering positional parameters and the remaining data queue length of SUs. Simulation results show that the proposed scheduling takes advantage of bandwidth fairness comparing the scheduling without positional parameters. Meanwhile it presents that the proposed scheduling has lower bandwidth jitter to make sure of fairness among SUs and high efficiency of system. © 2014 IEEE.


Sun P.,Harbin Institute of Technology | Sun P.,Key Laboratory of Police Wireless Digital Communication | Feng G.,Harbin Institute of Technology | Guan K.,Harbin Institute of Technology | Zhang Y.,Harbin Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2016

Science and Technology Informatization Bureau of the Ministry of Public Security released the new generation of police use digital trunking standard PDT in April 2010 in Beijing. Based on brief description of PDT and Tetra standards, this paper comparatively analyzes the specific performance indicators of two standard PDT and Tetra from the aspects of voice quality, voice services, data services, and so on. The analysis shows that advantages of PDT in terms of operational capacity is more obvious, and it is more in line with the development needs of Chinese police trunking communication system. © Springer India 2016.


Sun P.,Harbin Institute of Technology | Sun P.,Key Laboratory of Police Wireless Digital Communication | Tian R.,Harbin Institute of Technology | Xue H.,Harbin Institute of Technology | Wan K.,Harbin Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2016

This paper analyzes the standard of TETRA which is the existing digital trunking system evolution in our country and introduces the new requirements and characteristic of the channel technology for a new generation of broadband wireless trunking system of our country in detail. On this basis, this paper analyzes and simulates the new generation of PDT standard in the view of channel technology such as synchronization technology, channel modulation, and channel coding, respectively, and compares the performance of two plans. Analysis results show that China’s independent development and customization of a new generation of police digital trunking standard PDT is more in line with the national conditions and has showed great advantages. It will gradually replace the TETRA and become the mainstream of public security digital trunking system. © Springer India 2016.


Wang Y.,Harbin Institute of Technology | Wang Y.,Key Laboratory of Police Wireless Digital Communication | Ma L.,Harbin Institute of Technology | Ma L.,Key Laboratory of Police Wireless Digital Communication | And 2 more authors.
2016 IEEE International Conference on Communications, ICC 2016 | Year: 2016

This paper investigates the power efficiency in downlink cooperative networks under spherical channel uncertainties, using a worst-case robust formulation. The aim of this paper is to jointly optimize the base station (BS) operation mode, mobile user (MU) association, and beamformings to achieve the robust network power gain. We formulate the problem as a mixed-integer non-convex problem with infinite number signal-to-interference-plus-noise ratio (SINR) and maximum transmit power constraints, which is nontrivial to solve even without this constraint. By firstly translating the uncertainty in CSI to the uncertainty in its covariance matrix, the SINR constraint spans a convex set using the Lagrangian based method. Due to the coupled integer variables, the complexity of exhaustive search grows exponentially with network size, motivating to develop low-complexity heuristic algorithms. We propose to solve the problem via a novel two-layer (TL) algorithm: inner and outer layer, successively. Specifically, the BS operation mode is determined successively in the outer layer using a Rank based Successive Search (RSS) method, while in the inner layer, an iterative Difference of Convex (DC) based algorithm is proposed to determine the MU association. Simulation results illustrate that the proposed algorithm can significantly reduce the total power consumption over existing alternatives. © 2016 IEEE.


Wang Y.,Harbin Institute of Technology | Liang B.,University of Toronto | Xu Y.,Harbin Institute of Technology | Xu Y.,Key Laboratory of Police Wireless Digital Communication
2016 IEEE International Conference on Communications, ICC 2016 | Year: 2016

This paper considers a downlink Coordinated Multi Point (CoMP) transmission network, where the base stations (BSs) are connected to a central unit via backhaul links to serve mobile users (MUs). The objective is to jointly optimize the BS mode (active or sleep), MU association, and cooperative beamforming to minimize the total power consumption including backhauling power. We formulate the problem as a mixed-integer non-convex problem under the constraints of signal-to-interference-plus-noise ratio (SINR) requirements and limited BS power. By exploiting a hidden convexity structure of the SINR, the problem is first transformed equivalently into a mixed-integer second-order core programming (MI-SOCP) problem. Due to the coupled integer variables, the complexity of exhaustive search grows exponentially with network size, which motivates developing low-complexity heuristic algorithms. We propose a novel Two-stage Rank Selection (TRS) method to approximately solve the coupled MI-SOCP problem by determining the BS operation mode and MU association successively, which enables the remaining beamforming computation to be achieved through an efficient SOCP solution. We compare the computational complexity and numerical performance of TRS against several state-of-the-art alternatives. Analytical and simulation results demonstrate that the proposed method can significantly reduce the computational complexity and the total power consumption over existing alternatives. © 2016 IEEE.

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