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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271-280 订阅

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Analysis of Novel User Detection Scheme Based on Polling for E-MBMS Networks

Analysis of Novel User Detection Scheme Based on Polling for...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Yu Sheng Xin Guo Mugen Peng Wenbo Wang Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications China

Multimedia broadcast/multicast service (MBMS) is an important part of the UTRAN evolution and supports downlink streaming and download-and-play type services to large groups of users. For enhanced MBMS (E-MBMS) under 3GPP long term evolution (LTE) system, there are two ways to transmissions being performed: multi-cell transmissions and single-cell transmissions. One requirement identified to be supported is that the capability of the network to detect at least one MBMS user interested receiving one given MBMS service in the cell which belongs to above scenarios. It is significant to avoid unnecessary MBMS transmission in a cell where there is no MBMS user especially for single-cell transmissions mode. In this investigation, a low complex method is discussed to solve the detection on MBMS interested users in one cell and we also introduce code diversity strategy into the feedback signal transmission. Theoretical analysis and simulation results all show that the efficiency of proposed detection scheme is obvious which can dramatically reduce the average MBMS service polling time and control overhead.

关键词： Computer architecture Multiplexing Microprocessors Servers Multimedia communication Streaming media Digital multimedia broadcasting

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Traffic model for HTTP video page

Traffic model for HTTP video page

引用

International Conference on communications and networking in China (CHINACOM)

作者： Yijie Chen Wenbo Wang Lei Fu 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

As one of the most important applications over the Internet, HTTP traffic is experiencing a fast development period in these few years. The characteristics of the HTTP traffic have been changed due to the introducing of multimedia into web browsing application. One of the most remarkable multimedia pages is the video page which is becoming more and more popular with the web browsing users. In this paper, a novel traffic model for the video page is proposed. Parameters of this new model are estimated based on the real captured traces. Model verification is given and simulation results show that the new model has better results than the traditional model.

关键词： Traffic control Telecommunication traffic Streaming media IP networks Fractals Video signal processing laboratories wireless communication Statistical distributions Internet

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Parametric channel estimation by exploiting hopping pilots in uplink OFDMA

Parametric channel estimation by exploiting hopping pilots i...

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

作者： Xiaochuan Zhao 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

ISBN: (纸本)9781424426430

In this paper, a parametric channel estimation algorithm applicable to uplinks of orthogonal frequency division multiple access (OFDMA) systems whose subcarriers are pseudo-randomly allocated is proposed. By exploiting pilot hopping, estimation of signal parameters via rotational invariance technique (ESPRIT) is employed to estimate the path delays of the sparse multipath fading channel. From the delay information, a channel interpolator utilizing global pilots, which can be irregular distributed, is derived to estimate the channel state information on the desired tones. Moreover, a simple method of estimating the time correlation of the channel taps is introduced and integrated in the proposed algorithm. Simulation results demonstrate that the proposed algorithm outperforms the local linear channel interpolator within a wide range of SNRpsilas and Dopplerpsilas.

关键词： Channel estimation Delay estimation signal processing algorithms Frequency estimation Tiles Frequency conversion Parameter estimation Fading MIMO laboratories

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Providing Quality of Service for Voice-over-IP over TD-SCDMA HSDPA

Providing Quality of Service for Voice-over-IP over TD-SCDMA...

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IEEE Conference on Vehicular Technology (VTC)

作者： Wei Hong Chunjing Hu Wenbo Wang Jing Han 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, the results of the quality of service for VoIP service over TD-SCDMA HSDPA system are presented. The performances of the system with different scheduling algorithms and different retransmission times are simulated and analyzed. Dynamic scheduling, adaptive modulation and code (AMC), dynamic HARQ are implemented in the system-level simulation and some recommends for HARQ channel number and retransmission time and optimality are given.

关键词： Delay Multiaccess communication Spread spectrum communication Time division synchronous code division multiple access Indexes Quality of service Scheduling algorithm

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Doppler Spread Estimation by Subspace Tracking for OFDM Systems

Doppler Spread Estimation by Subspace Tracking for OFDM Syst...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Xiaochuan Zhao Tao Peng Ming Yang 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, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern. The least squared estimated channel frequency responses (CFR's) on pilot tones are used to generate the auto-correlation matrices with/without a known lag, from which the time correlation function can be measured. The maximum Doppler spread is acquired by inverting the time correlation function. Since the noise term will bias the estimator, the estimated CFR's are projected onto the delay subspace of the channel to reduce the bias term as well as the computation complexity. Furthermore, the subspace tracking algorithm is adopted to automatically update the delay subspace. Simulation results demonstrate the proposed algorithm can quickly converge to the true values for a wide range of SNR's and Doppler spreads in Rayleigh fading channels.

关键词： OFDM Delay estimation signal processing algorithms Frequency estimation Autocorrelation Noise reduction Fading laboratories wireless communication Frequency measurement

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Asynchronous Distributed Power Control under Interference Temperature Constraints

Asynchronous Distributed Power Control under Interference Te...

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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Qianxi Lu Wenbo Wang Wei Wang Tao Peng Wireless Signal Processing and Network Lab 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 spectrum opportunistically. This paper addresses the problem of power control in cognitive radio networks, to maximize the system utility in the presence of interference temperature constraint. Penalty function is applied in the problem formulation to take into account the transmit power budget and interference temperature constraints, which is solved efficiently by geometric programming. In the proposed distributed power control scheme, users exchange "price" messages which indicate the negative effect of interference at the receivers. Given this set of prices, each transmitter updates power levels on multiple channels using gradient descent method. It is proved that the proposed algorithm converges to the global optimum when operated in an totally asynchronous manner. The performance of the proposed scheme is investigated by numerical results in the end.

关键词： Power control Interference constraints Cognitive radio Temperature Programming profession Functional programming Radio transmitters Constraint optimization Pricing signal processing

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Spectrum sensing combining time and frequency domain in multipath fading channels

Spectrum sensing combining time and frequency domain in mult...

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International Conference on communications and networking in China (CHINACOM)

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

Spectrum sensing is one of the key challenges in the cognitive radio network. Primary user signal must be detected reliably in the low signal-to-noise ratio (SNR) regime and in multipath fading environments. This paper analyzes effects of time-variant multipath Rayleigh fading channel on cyclostationary characteristics and derives the relationship between cyclostationary statistics of transmitted and received signal. Depending on the distinct feature and the set of tested cyclic frequencies, the test statistics may have different performances. Cyclostationary features of small scale should be selected to be detected taking multipath effects into account. A novel solution to detect cyclostationary features combining time and frequency domain is proposed. Simulation results illustrating the reliability of solution as well as the effects of time-variant multipath fading channel on features are presented.

关键词： Frequency domain analysis Fading Statistical analysis Testing Cognitive radio signal detection signal to noise ratio Rayleigh channels signal analysis Performance evaluation

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Precoding Vector Distribution under Spatial Correlated Channel and Nonuniform Codebook Design

Precoding Vector Distribution under Spatial Correlated Chann...

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IEEE International Conference on communications (ICC)

作者： H. Long W. Wang H. Zhao K. Zheng 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, influence of spatial correlation on codebook-based precoding technology is analyzed. Optimum pre- coder distribution under spatial correlated channel is achieved at first, which is no longer isotropical on the unitary matrix (vector) set. Selection probability of the matrix (vector) in codebook is not uniform too. Then, a novel codebook design is presented for spatial correlated channel, which is termed as nonuniform codebook. Codebook is designed as function of spatial correlation characteristic of channel and presents a nonuniform quantization of unitary vector set. Smaller quantization error and higher spectral efficiency can be achieved by proposed codebook design than that of traditional fixed uniform codebook design, with the cost of slight feedback overhead increasing.

关键词： MIMO Quantization Vectors Feedback Transmitters communications Society Cost function Transmitting antennas Receiving antennas signal design

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Fractional Frequency Reuse in mobile WiMAX

Fractional Frequency Reuse in mobile WiMAX

引用

International Conference on communications and networking in China (CHINACOM)

作者： Yijie Chen Wenbo Wang Tao Li Xing Zhang 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

The worldwide interoperability for microwave access (WiMAX) can use frequency reuse factor 1 as its network deployment, but it may suffer from serious inter-cell interference (ICI) near the cell edge. Fractional frequency reuse (FFR) is introduced to deal with this problem. In this paper, we investigate the application of Fractional frequency reuse in mobile WiMAX system. Characteristics of frequency resource configurations in the mobile WiMAX system are described and a system model of FFR is presented, then the user partition principle and a combination partition scheme are proposed. Numerical results demonstrate that the proposed scheme has better results with respect to the conventional schemes.

关键词： WiMAX Frequency conversion Interference Downlink signal processing laboratories wireless communication Robustness Fading Radio spectrum management

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Agility improvements by censor-based cooperative spectrum sensing in cognitive radio networks

Agility improvements by censor-based cooperative spectrum se...

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International Conference on communications and networking in China (CHINACOM)

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

In cognitive radio networks, cooperative spectrum sensing is used to improve the performance of spectrum sensing. However, the limit of control channel bandwidth and the delay of sensing will more impact the spectrum sensing performance when the number of cognitive user becomes very large. In order to solve this problem, censor-based cooperative spectrum sensing scheme is presented to reduce communication overhead and total sensing time thus improve the agility of the cognitive radio networks, which indicates that the local sensing observation is censored and only local decision with reliable information is allowed to transmit to cognitive base-station. In order to prefix appropriate thresholds, a tradeoff between communication overhead and spectrum utilization is characterized to obtain the optimal no decision probability. Numerical results show that agility gain can be available without the loss of spectrum sensing reliability. Moreover, an improved censor-based scheme is proposed to reduce the spectrum utilization loss.

关键词： Cognitive radio communication system control Statistical distributions Bandwidth Delay wireless sensor networks signal processing laboratories wireless communication Telecommunication control

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