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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241-250 订阅

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Linear Transceiver processing in Non-Regenerative MIMO Relay Systems with Multiuser

Linear Transceiver Processing in Non-Regenerative MIMO Relay...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Huacheng Zeng Wenbo Wang Kan Zheng Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications China

In this paper, we investigate the linear processing at either base station or relay station in cellular network with a non-regenerative MIMO relay assisting. The purpose of linear processing is to equalize the two-hop fading channel in order to support multiuser transmission in downlink and uplink. Under the transmit power constraint at each station, the closed-form expressions of the suboptimal MMSE processing matrix in downlink and the optimal MMSE processing matrix in uplink are derived when the linear processing is performed at either base station or relay station. Simulation results demonstrate that the proposed MMSE strategies significantly outperform the corresponding ZF strategies in terms of BER.

关键词： Transceivers MIMO Relays Base stations Power system relaying Downlink Land mobile radio cellular systems Fading Closed-form solution Bit error rate

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Multi-Service Transmission in Multiuser Cooperative Networks

Multi-Service Transmission in Multiuser Cooperative Networks

引用

IEEE Conference on wireless communications and networking

作者： Chao Yang Wenbo Wang Xing Zhang Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

This paper analyzes the problem of multi-service transmission in multiuser cooperative networks. The objective is to maximize the best effort (BE) service utility while guaranteing the rate constraint of QoS service. In this paper, we first deduce the optimal power ratio of the source obtained power to total power. Based on this deduction result, the optimal solution of multi-service transmission is investigated. To further reduce the algorithm complexity, a suboptimal resource allocation algorithm is also proposed. Simulation results are provided to evaluate the utility and outage performance of these two algorithms when different value of power ratio is chosen.

关键词： Resource management Quality of service Protocols Relays signal processing algorithms Throughput Water resources Filling Power system modeling communications Society

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Increase the End-to-end Throughput of a Cognitive Radio Chain by Considering the Primary Usage Pattern and Transmission Scheduling

Increase the End-to-end Throughput of a Cognitive Radio Chai...

引用

IEEE Conference on wireless communications and networking

作者： Guang Lei Chunjing Hu Wei Wang Tao Peng 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

In this paper, we investigated the end-to-end throughput of a chain in Cognitive Radio Networks (CRNs). We found that, the end-to-end throughput is dependant on both the primary usage patterns and the transmission scheduling scheme being used. In addition, to increase the end-to-end throughput of a Cognitive Radio (CR) chain, the scheduling scheme should be adjusted according to the primary usage patterns of the CR links in the chain. In the paper, firstly, we proposed an algorithm to approximate the achievable end-to-end throughput considering the primary usage patterns by abstraction and iteration. Then, a novel layered packets transmission scheduling scheme was proposed in attempt to realize the approximated end-to-end throughput. Finally, extensive simulations were conducted and results showed that, using proposed transmission scheduling scheme, the achievable end-to-end throughput of a CR chain is increased by considering the primary usage patterns and the final end-to-end throughput is close to the approximation.

关键词： Throughput Cognitive radio Chromium Scheduling wireless communication FCC Space technology communications Society signal processing laboratories

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Route Selection Strategies in Cellular Networks with Two-Hop Relaying

Route Selection Strategies in Cellular Networks with Two-Hop...

引用

International Conference on wireless communications, networking and Mobile Computing (WiCom)

作者： Zhangchao Ma Kan Zheng Wenbo Wang Yang Liu Wireless Signal Processing Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

In the relay enhanced cellular network (REC), user terminals can flexibly select transmission routes to get service. This paper investigated the effect of route selection schemes on the system performance of REC. Besides the traditional schemes based on signal power and signal-to-interference-plus-noise-ratio (SINR), we evaluated the effective spectral efficiency (SE) based approach which takes into account the feature of multihop transmission. We compared these three schemes through system level simulation, which is based on 3GPP LTE system enhanced with 2-hop fixed relay nodes. The results confirm that the SE based scheme outperforms the other two schemes. Moreover, the results show that the effect of route selection heavily depends on the position of RNs. The REC system with signal power or SINR based route selection scheme yields even worse throughput than the non-relay case at certain positions. However, the SE-based scheme can always guarantee the gain from relaying.

关键词： Land mobile radio cellular systems signal to noise ratio Power system relaying Downlink Interference Routing signal processing algorithms Throughput Frame relay Power system modeling

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Resource allocation for OFDMA downlink with per-user MCS constraint

Resource allocation for OFDMA downlink with per-user MCS con...

引用

IEEE Youth Conference on Information, Computing and Telecommunication, YC-ICT

作者： Yicheng Lin Wenbo Wang Jiong Shi Li Wang Lan Shao Key Laboratory of Universal Wireless Communication Ministry of Education Wireless Signal Processing and Network Laboratory Beijing University of Posts and Telecommunications Beijing China

In this paper, we study the resource allocation problem in the downlink of an OFDMA system. Taking into account the constraint that each user can be assigned only one modulation and coding scheme (MCS), our goal is to maximize the system utility, which can be either the sum rate of users or certain fairness metric. The joint subcarrier, rate, and power allocation problem is formulated, and a straightforward suboptimal algorithm is proposed to solve this problem efficiently. Through computer simulation, our proposed algorithm is verified to be better in performance compared to the existing ones.

关键词： Resource management Downlink laboratories Modulation coding signal processing algorithms Base stations wireless communication wireless LAN signal processing Computer simulation

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A novel data stream selection algorithm for S-PARC in TD-SCDMA HSPA+system

A novel data stream selection algorithm for S-PARC in TD-SCD...

引用

IEEE International Conference on communications Technology and Applications, ICCTA

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

ISBN: (纸本)9781424448166

Selective per antenna rate control (S-PARC) technique has been decided to be deployed in time division-synchronous code division multiple access (TD-SCDMA) high speed packet access plus (HSPA+) system. In this paper, we propose an enhanced data stream selection algorithm for the proposal of S-PARC to improve Node B average throughput and initial block error rate (BLER) by pre-processing signal to interference plus noise ratio (SINR). The new algorithm considers the impact of channel fluctuation, Node B average initial BLER and continue scheduling of the same UE. It is shown that the proposed scheme can achieve remarkable improvement of system performance, especially when UEis under high speed mode, and it also has advantages in the following ways: little modification for current specification, low computational complexity and no additional controlling signals.

关键词： Time division synchronous code division multiple access Control systems signal to noise ratio Multiaccess communication Proposals Throughput Error analysis Interference Scheduling algorithm Fluctuations

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Approximate Performance Analysis of the Incremental Relaying Protocol and Modification

Approximate Performance Analysis of the Incremental Relaying...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Hang Long Kan Zheng Wenbo Wang Fangxiang Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424425143

The incremental relaying (IR) protocol outperforms simple amplify-and-forward and decode-and-forward protocols due to usage of feedback. Based on the IR protocol, a novel protocol termed as fractional incremental relaying (FIR) is firstly presented in this paper to achieve higher spectral efficiency. When a packet of data needs to be transmitted by the relay node, symbols are transmitted a few at a time as needed instead of the entire packet. Then, analysis result shows that the proposed protocol makes more efficient use of channel freedom degrees than the traditional IR protocol does. Finally, numerical results under independent Rayleigh fading demonstrate the advantage of the proposed FIR protocol.

关键词： Performance analysis Relays Finite impulse response filter wireless application protocol Feedback wireless communication Decoding Rayleigh channels Automatic repeat request Power system relaying

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On Performance of Multi-Timeslots Network Coding (MTNC) in wireless Relay Networks

On Performance of Multi-Timeslots Network Coding (MTNC) in W...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Hongmei Liu Gang Chuai Wei Bao Mugen Peng Wenbo Wang Wireless Signal Processing and Network Laboratory Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

Considering a wireless relay network composed of a source, several relays and a destination where the source transmits data packets to the destination through both direct and relay paths, a multi-timeslots network coding (MTNC) scheme is proposed to combat the lossy nature of wireless channel where the relay nodes with satisfying relay-destination (r - d) channel state firstly perform network coding on the successfully decoded data packets received from the source at previous timeslots and then forward the coded version to the destination. We focus on three metrics - Ergodic capacity, outage probability and symbol error rate to evaluate the performance of MTNC scheme and the replication-based relay (RR) scheme where a "best" relay node is selected out to replicate and forward the data packet. Precise closed form expression of ergodic capacity, tight estimated closed form expression of outage probability (OP) and symbol error rate (SER) are derived for both schemes, and also numerical results are shown to prove the gain of network coding. However, with increasing of the relay number, the improvement of outage probability and SER is limited.

关键词： Network coding Relays Capacity planning Error analysis laboratories Decoding Performance loss signal processing wireless communication Propagation losses

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A NOVEL VIRTUAL HYBRID ARQ MECHANISM FOR MULTI-CELL MBMS TRANSMISSION IN wireless NETWORK

A NOVEL VIRTUAL HYBRID ARQ MECHANISM FOR MULTI-CELL MBMS TRA...

引用

2009 IEEE International Conference on communications Technology and Applications(2009年IEEE国际通信技术与应用大会 IEEE ICCTA2009)

作者： Xin Guo Xiaodong Ji Mugen Peng Wenbo Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876

ISBN: (纸本)9781424448166

Multi-cell transmission in single frequency networks (SFN)area for MBMS can be used to improve the system performance. This paper proposes a novel Virtual Hybrid Automatic Repeat Request(V-HARQ) mechanism for multi-cell MBMS transmission in the UMTS networks, by which multiple signals like the retransmission versions of HARQ mechanism in unicast mode from different cells can be received and combined at the receiver side. Moreover, NAK implosion problem can be resolved with the mechanism. By means of performance analysis and simulation results, a significant system throughput improvement coming from soft combining gains with tiny packet delivery delay practically is pointed out.

关键词： SFN V-HARQ NAK implosion

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Optimal Route Selection and Resource Allocation in Multi-Hop Cognitive Radio Networks

Optimal Route Selection and Resource Allocation in Multi-Hop...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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

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 joint route selection and resource allocation in OFDMA-based multihop cognitive radio networks, in the objective of optimizing different types of end-to-end performance. Aiming to solve it optimally, we first show that this problem of optimal resource allocation can be formulated as a convex optimization problem and identify its necessary and sufficient conditions. Based on this conclusion, we propose an iterative algorithm that can be implemented in a distributed manner. This algorithm applies Lagrangian duality theory and the Frank-Wolfe method. The scheme thus converges to a globally optimal solution. We present numerical results from using the algorithm to provide insight into the optimal cross-layer design, e.g., the relationship between bottleneck throughput and hops, and the effect of interference temperature constraints.

关键词： Resource management Spread spectrum communication Cognitive radio Iterative algorithms Sufficient conditions Lagrangian functions Cross layer design Throughput Interference Temperature

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