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检索条件"机构=Wireless Signal Processing and Networking Lab Key Laboratory of Universal Wireless Communication"

共 294 条记录，以下是231-240 订阅

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Outage probability performance analysis for heterogeneous and homogeneous cooperative system over Nakagami-m model

Outage probability performance analysis for heterogeneous an...

引用

2009 IEEE International Conference on communications Technology and Applications, IEEE ICCTA2009

作者： Zhu, Song Wenbo, Wang Mugen, Peng Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424448203

A novel heterogeneous cooperative relay channel model is proposed in this article. It can integrate various wireless access systems into one entity and improve the spectrum efficiency remarkably. According to the characteristics of the heterogeneous and conventional homogeneous cooperative relay channel model, the outage probability performance is investigated over Nakagami-m fading model. A numerical simulation for the uplink and downlink heterogeneous and homogeneous cooperative relay channels is given to describe the amount of relays impact on the outage performance in different scenarios and distinguish the differences of heterogeneous and homogeneous systems. ©2009 IEEE.

关键词： Electric relays

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Two effective unicast modes in MIMO multi-relay systems

Two effective unicast modes in MIMO multi-relay systems

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2009 3rd IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for wireless communications, MAPE 2009

作者： Wei, Meiying Hu, Chunjing Long, Hang Zheng, Kan Wang, Wenbo Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424440740

In MIMO multi-relay systems, close-loop precoding at relay nodes is not necessary if unicast modes are carried out. However, in unicast modes, the inter-stream interference at relay nodes may degrade the system capacity. In this paper, two unicast modes are proposed to reduce the negative impact of the residual interference. The first one suppresses the interference by applying orthogonal precoding at the source node and the second one suppresses the residual interference through receiving filters at relay nodes. Analysis of the system capacity performance are given and simulation results will demonstrate the superiority of proposed modes. ©2009 IEEE.

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Adaptive channel searching scheme for cooperative spectrum sensing in cognitive radio networks

Adaptive channel searching scheme for cooperative spectrum s...

引用

2009 IEEE wireless communications and networking Conference, WCNC 2009

作者： Guo, Chen Peng, Tao Qi, Yuan Wang, Wenbo Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Xitucheng Road No.10 Beijing 100876 China

ISBN: (纸本)9781424429486

The MAC-layer sensing, as a key component of spectrum sensing in cognitive radio, concerns the sensing mechanism design to determine when to sense and access which channel. An important issue of MAC-layer sensing is to find an available channel with a minimized searching delay for the cognitive transmission without any harmful interference. In this paper, we focus on this issue and propose adaptive searching scheme and cluster-based searching scheme to reduce the searching time when channel conditions are various and the cooperative sensing is applied. Moreover, the optimization of these two schemes are also developed in this paper. By adaptive selecting the searching parameters according to the current environment, the average consumed time of channel searching can be minimized, while the searching quality is also satisfied. The simulation results verify the confidence of proposed schemes and show a better searching performance when combining these two schemes. © 2009 IEEE.

关键词： Cognitive radio

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Resource allocation optimization for OFDM-based amplify-and-forward multi-relay system

Resource allocation optimization for OFDM-based amplify-and-...

引用

2009 IEEE wireless communications and networking Conference, WCNC 2009

作者： Lin, Yicheng Wang, Wenbo Fan, Bin Huang, Lin Zheng, Kan Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Orange Labs France Telecom RandD Beijing China

ISBN: (纸本)9781424429486

A two-hop relaying system where a source communicates with its destination through multiple relay nodes is studied for capacity maximization. Amplify-and-forward (AF) relaying is adopted for its simplicity. Taking the independent channel transfer function of different subcarriers and links into consideration, we formulate a resource allocation optimization problem for joint subcarrier assignment, subcarrier matching and power allocation of the two-hop transmission. A heuristic suboptimal algorithm which decomposes the joint problem is proposed. First, equal power allocation is assumed in a partialupdate manner to help assigning subcarriers to each relay for matching;then optimal power allocation is achieved by joint waterfilling of source and relays under separate power constraints to further increase system capacity. Numerical results show that the proposed algorithm has a near-optimal performance. © 2009 IEEE.

关键词： Orthogonal frequency division multiplexing

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QoS performance analysis on carrier aggregation based LTE-A systems

QoS performance analysis on carrier aggregation based LTE-A ...

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Institution of Engineering and Technology International communication Conference on wireless Mobile and Computing

作者： Zhang, L. Wang, Y.Y. Huang, L. Wang, H.L. Wang, W.B. Wireless Signal Processing and Network Lab. Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100088 China Beijing 100080 China

ISBN: (纸本)9781849191388

Carrier aggregation (CA) is a good solution for third-generation (3G) Long Term Evolution-Advanced (LTE-A) systems to fulfil the system bandwidth (BW) extension requirements and also ensure the backwards compatibility towards 3G LTE. In this paper, we compare the quality of service (QoS) performances of two different multi-user scheduling schemes in CA based LTE-A systems, i.e. separated random user scheduling (SRUS) and joint user scheduling (JUS). The former is simpler but less efficient while the latter is optimal but with higher signalling overhead. Moreover, only one single component carrier (CC) is needed to access for user equipment (UE) in the case of SRUS while all the CCs have to be connected in the case of JUS. Simulation results show that the SRUS scheme is feasible and only little performance loss in continuous and heavy traffic load scenarios with full or Poisson-based finite buffer traffic input.

关键词： Long Term Evolution (LTE)

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Joint Power and Rate Control Considering Fairness for Cognitive Radio Network

Joint Power and Rate Control Considering Fairness for Cognit...

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IEEE Conference on wireless communications and networking

作者： Yajun Zhu Zhenqiang Sun Wei Wang Tao Peng Wenbo Wang Wireless Signal Processing and Networking Lab Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications China

In cognitive radio networks, the unlicensed users can utilize the unoccupied licensed spectrum opportunistically. In this paper, we propose a joint power and end-to-end rate control algorithm considering restricting the interference to licensed users. By duality theory, the optimal resource allocation solution is given for the unlicensed users while satisfying the interference temperature limits. An asynchronous algorithm is proposed to be implemented in practical networks. Finally, we give a discussion to the proposed algorithm's performance on fairness. Numerical results show that the proposed algorithm can limit the interference to licensed user under a predefined threshold while maintaining a satisfied data rate fairly.

关键词： Radio control Cognitive radio Interference signal processing algorithms Power control Temperature communication system control Telecommunication control Resource management Radio spectrum management

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Optimal subcarrier and power allocation under interference temperature constraints

Optimal subcarrier and power allocation under interference t...

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2009 IEEE wireless communications and networking Conference, WCNC 2009

作者： Lu, Qianxi Peng, Tao Wang, Wei Wang, Wenbo Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications P.O.Box 93# Xitucheng Road No.10 Beijing 100876 China

ISBN: (纸本)9781424429486

Cognitive radio makes it possible for an unlicensed user to access a licensed spectrum opportunistically on the basis of non-interfering. This paper addresses the problem of resource allocation for multiaccess channel (MAC) of OFDMA-based cognitive radio networks, taking into account of the interference temperature constraints. The objective is to maximize the system utility, which is used to quantify different quality-of-service (QoS) requirements of different users. Firstly, a theoretical framework is provided, where necessary and sufficient conditions for optimal subcarrier assignment and power allocation are presented under certain constraints. Then, an effective algorithm is devised for more practical conditions based on Lagrangian duality theory, where subgradient/ellipsoid method is applied for Lagrangian multipliers iteration. With polynomial time complexities, the proposed resource allocation algorithm is proved to achieve optimal system performance by numerical results. © 2009 IEEE.

关键词： Convex optimization

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Optimal Subcarrier and Power Allocation under Interference Temperature Constraints

Optimal Subcarrier and Power Allocation under Interference T...

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IEEE Conference on wireless communications and networking

作者： Qianxi Lu Tao Peng Wei Wang Wenbo Wang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China

关键词： Temperature Interference constraints Cognitive radio Resource management Lagrangian functions Quality of service Sufficient conditions Constraint theory Ellipsoids Polynomials

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Adaptive full-diversity full-rate space-time block code with linear decoding complexity

Adaptive full-diversity full-rate space-time block code with...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for wireless communications (MAPE)

作者： Li Wang Hua Jiang Lan Shao Hui Zhao Wenbo Wang Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications China

We propose an adaptive space-time block code (A-STBC) for the wireless communication system. A group of minimum-decoding-complexity quasi-orthogonal STBC (MDC-QO-STBC) matrices which are the same size and code rate but different in the performance of combating inter-symbol-interference are obtained, and a specific matrix is selected from the group for a certain channel according to its channel state information. For the proposed A-STBC, linear decoding can be used in a system with four transmit antennas, thus the lowest decoding complexity is achieved, in addition, full-diversity and full-rate can also be obtained. The simulation results show that the A-STBC has a lower block error ratio (than normal MDC-QO-STBC) and a higher throughput (than single-user precoding). A-STBC is an effective combination of the simplification in decoding and the performance advantages in block error rate as well as throughput.

关键词： Block codes Maximum likelihood decoding Throughput Receiving antennas Transmitting antennas Intersymbol interference wireless communication Channel state information Chromium wireless LAN

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Adaptive Channel Searching Scheme for Cooperative Spectrum Sensing in Cognitive Radio Networks

Adaptive Channel Searching Scheme for Cooperative Spectrum S...

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IEEE Conference on wireless communications and networking

作者： Chen Guo Tao Peng Yuan Qi Wenbo Wang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

关键词： Cognitive radio wireless sensor networks wireless communication Delay Monitoring Switches communications Society Adaptive signal processing laboratories Interference

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