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PERFORMANCE EVALUATION OF CHANNEL DETECTION FOR THE COOPERATIVE NETWORK CODING IN THE wireless RELAY NETWORK

PERFORMANCE EVALUATION OF CHANNEL DETECTION FOR THE COOPERAT...

引用

2011 International Conference on communications Technology and Applications(2011年通信技术与应用国际会议 ICCTA 2011)

作者： Mugen Peng Han Fang Wenbin Guo Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communicatio

ISBN: (纸本)9781618399267

Network coding is regarded as a promising technique to improve system throughput of the Long-Term Evolution (LTE) system. The channel detection technique plays a significant role in the cooperative relay network with network coding. In this paper, an minimum-mean-square-error (MMSE) joint detection strategy for the cooperative network coding is proposed. The receiver utilizes the direct link signals and the forwarding network coded signal for joint detection, and recovers the source data of multiple users. It is shown that with the MMSE joint detection, the relay network with network coding shows better system performance with lower backhaul cost and higher system throughput than the traditional relay network at high signal-to-noise ratio (SNR). In addition, as the number of users increases, the network coding scheme based on the proposed channel detection brings a more significant improvement in throughput at high SNR.

关键词： cooperative relay network coding MMSE joint detection multi-user LTE

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Inter-piconet interference mitigation schemes for converged BTLE and cellular network

Inter-piconet interference mitigation schemes for converged ...

引用

2011 International Conference on wireless communications and signal processing, WCSP 2011

作者： Hu, Ying Wang, Guizhu Shan, Lianhai Yuan, Zhi Ouyang, Yuling Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei China Shanghai Research Center for Wireless Communications Key Lab of Wireless Sensor Network and Communication CAS Shanghai China

ISBN: (纸本)9781457710100

In a Bluetooth Low Energy (BTLE) piconet, the master node controls the channel access by a simple polling scheme. Due to an absence of coordination among independent master nodes while accessing the wireless medium, devices will encounter high packet interference if many piconets are simultaneously operating in the same area. In this paper, we propose two schemes in the converged BTLE and cellular network, one is based on bad channel prediction for the BTLE piconets, and the other is based on frequency hopping sequences transformation. We compare the performance of the proposed algorithms with original scheme in the form of channel collision probability and new signaling overhead. The simulation results show that the proposed schemes can reduce channel collision probability significantly and simultaneously the new signaling overhead introduced to the downlink is not large. © 2011 IEEE.

关键词： Bluetooth

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PERFORMANCE ANALYSIS OF SUPERPOSITION CODING FOR MIXED UNICAST AND BROADCAST TRANSMISSION USING OPPORTUNISTIC MULTICAST SCHEDULING SCHEME IN LTE-A SYSTEM

PERFORMANCE ANALYSIS OF SUPERPOSITION CODING FOR MIXED UNICA...

引用

2011 International Conference on communications Technology and Applications(2011年通信技术与应用国际会议 ICCTA 2011)

作者： Xing Zhang Meng Yao Qinzi Li Wenbo Wang Wireless Signal Processing and Network LabKey Laboratory of Universal Wireless Communications Mini Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communications Min

ISBN: (纸本)9781618399267

A scheme transmitting superposition coding (SC), which superimposes unicast data to multicast data, using opportunistic multicast scheduling (OMS) scheme, is proposed and its performance is evaluated and simulated in this paper. Although the scheme is a little weaker than traditional scheme using QPSK modulation method in bit error rate (BER) performance, its throughput and system time delay promote considerably. Numerical results show that when user channel condition is weak and signal to noise ratio (SNR) is not high, the new scheme can outperform the conventional scheme in terms of system performances.

关键词： Superposition coding broadcast unicast OMS scheme BER throughput timedelay LTE-Advanced system

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Performance Analysis and QoE-Aware Enhancement for IEEE 802.11e EDCA under Unsaturations

Performance Analysis and QoE-Aware Enhancement for IEEE 802....

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Yueying Zhang Wei Li Junlong Zhang Hang Long Wenbo Wang Wireless Signal Processing and Network Lab Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts & Telecommunications Beijing China

In this paper, a novel non-saturation analytical model for enhanced distributed channel access (EDCA) in IEEE 802.11e wireless local area network (WLAN) is proposed. Unlike previous work focused on saturation conditions, this model uses Markov and M/M/1/K theories to predict MAC delay, service time, throughput and loss. Moreover, the EDCA technique resets the default contention window (CW) of stations statically after each successful transmission. The static behavior which can not adapt to the network state results in bad performance. Consequently, we introduce an enhancement scheme based on quality of experience (QoE) perceived by users to adjust CW adaptively. Instead of solely relying on technical parameters such as loss and delay, our scheme is based on QoE which contains the parameters inherently. Simulations validate this model and demonstrate better performance of our scheme compared with traditional EDCA regarding QoS parameters and user satisfaction.

关键词： Analytical models IEEE 802.11e Standard Delay Quality of service Throughput Mathematical model wireless LAN

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Lattice Reduction Aided Precoding Mechanism for MIMO Systems

Lattice Reduction Aided Precoding Mechanism for MIMO Systems

引用

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

作者： Xiaoping Zhou Xingliang Yin 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

A lattice reduction (LR) aided precoding mechanism is proposed for the closed-loop multiple input multiple output (MIMO) systems. According to this mechanism, a LR based codebook construction algorithm is proposed. In this codebook construction algorithm, the channel matrix is quantified basing the lattice reduction operation. On one hand, this precoding mechanism achieves full receive diversity gain, which will greatly improve the reliability of transmission; on the other hand, this precoding mechanism makes different sub-channels of the equivalent channel matrix have similar performance, which enables once modulation coding scheme choice for different data streams. Moreover, the proposed scheme is suitable for both uncorrelated and correlated channel. The simulation results show that the LR aided precoding mechanism proposed has better throughput performance than the existing precoding scheme with the same size of codebook, and when signal to noise ratio equals 16 dB, throughput gain is up to 28%.

关键词： MIMO Lattices Detectors Throughput Diversity methods Receivers Matrix decomposition

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Distributed compressed sensing for block-sparse signals

Distributed compressed sensing for block-sparse signals

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio communications (PIMRC)

作者： Xing Wang Wenbin Guo Yang Lu 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

To address the problems of high sampling rates, shadow fading and additive noise from the receiver, in this paper, a distributed compressed sampling (DCS) and centralized reconstruction approach which utilize the spatial diversity against fading channels is proposed. Unlike traditional centralized reconstruction, in this paper, we centralized recover the spectrums by exploiting the block-sparsity which is rather prevalent in multi-band signals. In DCS, first each CR samples the signals with a sub-Nyquist sampling rate independently, then the sampled data are uploaded to the fusion center (FC), finally FC reconstructs these data simultaneously. To exploit the block-sparsity, two new centralized recovery algorithms simultaneous block orthogonal matching pursuit (S-BOMP) and simultaneous binary tree based block orthogonal matching pursuit (S-BTBOMP) are developed. Simulation results show they outperform existing simultaneous recovery algorithms which don't take block-sparsity into consideration.

关键词： Matching pursuit algorithms Compressed sensing Sensors Fading Wideband signal to noise ratio Binary trees

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Distributed Streaming Compressive Spectrum Sensing for Wide-Band Cognitive Radio Networks

Distributed Streaming Compressive Spectrum Sensing for Wide-...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yang Lu Wenbin Guo Xing Wang 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

This paper presents a novel Distributed Streaming Compressive Spectrum Sensing (DSCSS) algorithm for wide-band spectrum sensing under decentralized cognitive radio network (CRN) scenario. In contrary to traditional compressive sensing (CS) that only focuses on fixed-length signal's compressive sampling and reconstruction, DSCSS follows streaming CS framework, where Analog-to-Information Converter (AIC) is utilized to perform streaming signal acquisition below Nyquist sampling rate at individual cognitive radios (CR). Since the sparsity of wide-band spectrum is unavailable in practical situation, DSCSS alternatively estimates the sparsity and the true support set of the spectrum, and the estimated support set is marked and exchanged to the other CRs as a priori information, which are merged and utilized to obtain cooperative sensing gain. This process repeats to acquire performance promotion progressively until robust spectrum sensing results are achieved. Moreover, the low computational complexity makes DSCSS more suitable for on-line applications. Various simulations and comparisons are performed to show the efficiency of the proposed approach, the effectiveness of which is testified.

关键词： Sensors Cognitive radio Compressed sensing Fading Matching pursuit algorithms signal to noise ratio

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Adaptive Compressive Sampling for Wideband signals

Adaptive Compressive Sampling for Wideband Signals

引用

IEEE Conference on Vehicular Technology (VTC)

In traditional compressive sampling approach, it's always assumed the sparsity of a signal is known. However, we always can't get this in Cognitive Radio (CR) network. This makes a great barrier to the practical usage of compressive sampling. This paper develops an Adaptive Compressive Sampling (ACS) approach for wideband signals. It doesn't need the sparsity as a priori knowledge. Also, once the sparsity changes, it can adaptively change the proper sampling rate through comparing the different results recovered by different sampling rates. When there is no difference between the results recovered by two different sampling rates, the smaller sampling rate of these two is the proper sampling rate to recover the original information of the signal exactly. Moreover, ACS can provide the unoccupied spectrum holes to Secondary Users (SU) in CR for dynamic spectrum access.

关键词： Coherence Wideband Matching pursuit algorithms signal to noise ratio Compressed sensing Sensors

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A cooperative hierarchical transmission scheme in railway wireless communication networks

A cooperative hierarchical transmission scheme in railway wi...

引用

IEEE International Conference on Service Operations and Logistics, and Informatics, SOLI

作者： Fanglong Hu Kan Zheng Hang Long 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

Railway wireless communication networks demand good system coverage and high transmission rate. To meet these requirements, in the railway wireless communication networks, we propose a cooperative hierarchical transmission scheme with the deployment of relay nodes. In our scheme, the requested data of each user at its serving evolved NodeB is firstly divided into high priority data stream and low priority data stream. The high priority data stream, which ensures basic service requirements, is sent to the user through both the direct-link and the relay-link so as to provide the reliable transmission by exploiting the time and space diversity gains. For the low priority data, it is only transmitted through the direct-link in order to enhance the service quality. Simulations demonstrate that the proposed scheme outperforms the conventional wireless network without relays in terms of channel capacity, outage probability and system coverage.

关键词： Nickel

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Outage performance of relay assisted hybrid overlay/underlay cognitive radio systems

Outage performance of relay assisted hybrid overlay/underlay...

引用

IEEE Conference on wireless communications and networking

作者： Zhi Yan Xing Zhang 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, considering a relay assisted hybrid overlay/underlay cognitive radio system with peak interference power constraints for protecting the primary system, the upper bound of outage probability of secondary system with power limit is derived. The results show that the outage performance of secondary system improves with the increase of maximum tolerated interference power before a specific threshold, but it keeps unchanged after the threshold. The results also show that more relays can provide higher diversity gain to get better outage performance in this kind of cognitive radio system. It is also indicated that the outage performance of secondary system is affected by the activity behavior of primary network, and relay cooperation can decrease this kind of affection.

关键词： Relays Cognitive radio Interference Radio transmitters Upper bound signal to noise ratio Hybrid power systems

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