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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141-150 订阅

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Optimal Resource allocation for multi-D2D links underlying OFDMA-based communications

Optimal Resource allocation for multi-D2D links underlying O...

引用

2012 8th International Conference on wireless communications, networking and Mobile Computing, WiCOM 2012

作者： Bo, Peng Chunjing, Hu Tao, Peng Wenbo, Wang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of Education China

ISBN: (纸本)9781612846835

This paper analyzes the optimal resource allocation for multi-D2D(Device-to-Device) links underlying OFDMA-based networks with the target of reaching maximum sum-throughput of D2D transmission. In order to guarantee QoS (Quality of Service) of cellular users, the rate loss of cellular users is limited by a lower-bound constraint RLC. Meanwhile, the D2D link is allowed to use a sub-carrier only when the throughput from spectrum reusing exceeds a certain threshold. Since the primal problem is non-convex, we solve it through a subgradient-based algorithm by applying Lagrangian dual theory. The numerical results demonstrate the effectiveness and convergence of the algorithm by comparison with water-filling-based method. Besides, the subcarrier-specific RLC is more relaxed than the user-specific RLC for D2D transmission, which means D2D transmission can reach higher throughput under the latter constraint. © 2012 IEEE.

关键词： Convex optimization

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Analysis of adjacent channel interference from IMT-A system to broadcasting system in China

Analysis of adjacent channel interference from IMT-A system ...

引用

2012 IEEE 12th International Conference on Computer and Information Technology, CIT 2012

作者： Chen, Jiadi Zhang, Yuyan Li, Wei Long, Hang Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9780769548586

Due to the scarcity of the frequency spectrum, coexistence of two systems in adjacent channels is possible if reasonable measures are taken in the network plan and spectrum plan. According to the Chinese and international business applications, mobile and broadcasting services will coexist at ultra high frequency band which means that harmful interference may be transpired. In this paper, the interference from the International Mobile Telecommunication-Advanced system at 698-806 MHz to the broadcasting system below 698 MHz is analyzed using Monte Carlo simulations. A simplified simulation flow is proposed and the results are presented to provide the necessary technical support for the spectrum plan and interference coordination. © 2012 IEEE.

关键词： Monte Carlo methods

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Performance and analysis on LTE system under adjacent channel interference of broadcasting system

Performance and analysis on LTE system under adjacent channe...

引用

2012 IEEE 12th International Conference on Computer and Information Technology, CIT 2012

作者： Li, Wei Chen, Jiadi Long, Hang Wu, Bin Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Institute of Microelectronics Chinese Academy of Sciences China

ISBN: (纸本)9780769548586

In the progress of the standardization of the long term evolution (LTE) system, the interference between the LTE system and other systems is quite important. In China, the LTE system and the broadcasting system may deploy in the same geographical area in adjacent frequency channels around the band of 698 MHz in digital dividend spectrum, which is free up for the conversion from analog TV to digital TV. Therefore, with the deployment of frequency planning, it is urgent to ensure the coexistence between the LTE system and the broadcasting system. This paper is aiming at analyzing the interference from the broadcasting system to the LTE system with different distances between the two systems and different offset distances with Monte Carlo simulations. We calculate the required adjacent channel interference ratio values to achieve 5% throughput loss. Simulation results show that the interference situation of LTE uplink is much more severe than LTE downlink and should be paid more attention. Additionally, it can be improved by locating the broadcasting system transmitter at the LTE system's cell edge. © 2012 IEEE.

关键词： Digital television

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Analysis of unitary distributed spatial-temporal precoding in MIMO relay systems

Analysis of unitary distributed spatial-temporal precoding i...

引用

2012 IEEE 12th International Conference on Computer and Information Technology, CIT 2012

作者： Long, Hang Xiang, Wei Zhang, Yueying Wang, Jing Wu, Bin Wireless Signal Processing and Networking Lab. Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Faculty of Engineering and Surveying University of Southern Queensland Toowoomba QLD 4350 Australia Institute of Microelectronics Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769548586

In the multiple-input and multiple-output relay system, distributed spatial-temporal precoding (DSTP) has been proven to be capable of improving the system reliability and capacity with limited feedback. The outage performance of unitary DSTP is analyzed in this paper. By analyzing the singular values of the normalized equivalent channel, an upper bound of the outage probability is given. Then, the achievable diversity order is derived. Numerical and simulation results demonstrate the effectiveness of our analytical method. © 2012 IEEE.

关键词： Numerical methods

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Optimal resource allocation for time sharing relaying system

Optimal resource allocation for time sharing relaying system

引用

2012 1st IEEE International Conference on communications in China, ICCC 2012

作者： Feng, Junwei Peng, Mugen Li, Jian Zhang, Xiang Xing, Yihai Hu, Wei Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing 100876 China China Academy of Telecommunication Research of MIIT China Potevio Institute of Technology Co. Ltd. China

ISBN: (纸本)9781467328159

A time sharing relaying system model using Orthogonal Frequency Division Multiple Access (OFDMA) is investigated in this paper, where eNode B transmits to relay and macro user equipments (M-UEs) during the first time slot, and in the second time slot messages are conveyed to remote user equipments (R-UEs) by the relay with relay acting in the decode-and-forward (DF) mode. These two transmissions are allocated in the same frequency domain. By converting this system model into a bandwidth sharing one, we formulate and solve an optimization problem to maximum data rate by optimizing the bandwidth allocated to each link. Simulation results show that our proposed optimal resource allocation algorithm outperforms the traditional schemes significantly, especially when the channel condition between relay and R-UE is preferable. © 2012 IEEE.

关键词： Frequency division multiple access

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A Low Complexity Channel Estimation Approach of LTE Downlink System

A Low Complexity Channel Estimation Approach of LTE Downlink...

引用

2012 IEEE 14th International Conference on communication Technology

作者： SubinWang Chunjing Hu Tao Peng Wenbo Wang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of EducationBeijing University of Posts & Telecommunications

Channel estimation is critical to receiver performance in the long term evolution (LTE) *** signals are interspersed with data signals among the subcarriers to aid channel *** minimum mean square error (LMMSE) channel estimation is an efficient approach to estimate the knowledge of channel with high *** paper proposed a channel estimation approach based on singular value decomposition (SVD) for downlink channel in LTE *** to the conventional algorithm,the proposed approach investigates the channel autocorrelation matrix respectively and substitutes it by small submatrices to reduce the *** simulation result demonstrates that the complexity is significantly reduced with negligible performance degradation,so it could be a candidate of the channel estimation algorithm for downlink channel estimation in LTE system.

关键词： LTE,Channel Estimation,LS,LMMSE,SVD

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Transmission capacity of D2D communication under heterogeneous networks with Dual Bands

Transmission capacity of D2D communication under heterogeneo...

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International Conference on Cognitive Radio Oriented wireless Networks and communications

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

This paper analyzes the maximum achievable transmission capacity of the D2D communication system under heterogeneous networks. The heterogeneous networks contain two primary systems working on independent bands and D2D communication guarantees the target outage probabilities of both systems on each band. By utilizing stochastic geometry, the effects of the spatial densities and the transmission power allocation ratio on the achievable transmission capacity are presented. Moreover, the optimal transmission density of D2D pairs and the optimal power allocation ratio are derived. The maximum capacity of D2D communication is defined based on the former optimal value from theoretical results. It is shown that the optimal power allocation ratio is proportional to the product of bandwidth, node density and transmission power of two primary systems.

关键词： Interference Resource management Receivers Transmitters Bandwidth Mobile communication

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Optimal resource allocation for network coding in multiple two-way relay OFDM systems

Optimal resource allocation for network coding in multiple t...

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IEEE Conference on wireless communications and networking

作者： Bin Han Wenbo Wang Mugen Peng Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

This paper investigates optimal resource allocation in orthogonal frequency division multiplexing (OFDM) based multiple two-way relay systems operating with analog network coding (ANC) protocol. We formulate a joint optimization problem considering power allocation, relay selection and subcarrier paring to maximize the sum capacity under individual power constraints on each node. By applying dual method, an unified optimization framework is provided and the problem is solved efficiently. Based on this framework, we further propose three suboptimal algorithms. The complexity of optimal algorithm (ORA) and three suboptimal algorithms are evaluated, and the analysis results show that the complexity of ORA is only a polynomial function of the number of subcarriers and relay nodes. Simulation results demonstrate that the proposed ORA scheme yields substantial performance improvement over baseline scheme, and suboptimal algorithms can achieve a trade off between performance and complexity.

关键词： Relays Resource management Complexity theory OFDM Algorithm design and analysis Optimization Protocols

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Distributed Bayesian Compressive Sensing using Gibbs sampler

Distributed Bayesian Compressive Sensing using Gibbs sampler

引用

International Conference on wireless communications and signal processing (WCSP)

作者： Hua Ai Yang Lu Wenbin Guo Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

Bayesian Compressive Sensing (BCS) observes s-parse signal from the statistics viewpoint. In BCS, a Bayesian hierarchy is established utilizing Bayesian inference, thus gives the reconstruction algorithm plenty of robust and flexibility. When dealing with distributed scenario, Bayesian hierarchy is also an effective method. Not only can statistic model be built on the sparse signal itself, but also the inter-correlation between distributed signals can be exploited from statistic viewpoint. Based on BCS, connection between distributed signals is studied and utilized. By adopting spike and slab model, a Bayesian hierarchy including inter-correlation is established to model the distributed compressive sensing (DCS) architecture. With the help of Gibbs sampler, the hierarchy becomes solvable. Simulation results show it has a manifest promotion to reconstruction performance.

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A rank adaptive beamforming scheme for TDD LTE system with imperfect CSI

A rank adaptive beamforming scheme for TDD LTE system with i...

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International Conference on wireless communications and signal processing (WCSP)

作者： Li Zhang Xiaodong Ji Mugen Peng Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

A rank adaptive beamforming scheme for Long Term Evolution (LTE) system with imperfect channel state information (CSI) is proposed in this paper, where the rank of user equipments (UEs) is adapted based on two configurable thresholds: channel quality indicator (CQI) threshold and channel eigenvalue ratio threshold. In this scheme, the channel eigenvalue ratio threshold varies with channel estimation error in contrast to previous fixed threshold in rank adaptation. Moreover, the adaptation parameter of eigenvalue ratio threshold can be optimized based on hybrid automatic repeat request (HARQ) feedback information and current transmission mode. By introducing these configurable thresholds and parameter optimization, this scheme can achieve more accurate beam-forming rank adaptation and resist the performance loss due to imperfect CSI. Simulation results show that our proposed rank adaptive beamforming scheme can obtain tradeoff between system robustness and spectrum efficiency.

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