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Interference coordination between femtocells in LTE-advanced networks with carrier aggregation

Interference coordination between femtocells in LTE-advanced...

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作者： Zheng, Kan Hu, Fanglong Lei, Lei Wang, Wenbo Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communication Beijing University of PostsandTelecommunications Beijing 100088 China Wireless System Lab. China Mobile Research Institute Beijing 100053 China

ISBN: (纸本)9780984589333

Femtocells technology has emerged as a promising solution to provide the indoor coverage in the 3rd generation (3G) long-term evolution (LTE) and its advanced (LTE-Advanced) networks. In this paper, we propose a two-step interference coordination scheme to deal with the interference between femtocells in LTE-Advanced networks with carrier aggregation. Each femtocell is assigned a carrier that is non-overlapping with its interfering femtocells or has the least interference in the first step. Then, in the second step, more carriers are attempted to be used by a femtocell in order to improve the system spectrum efficiency based on the specified utility functions. Our simulation results demonstrate the effectiveness of the proposed interference coordination scheme in terms of throughput.

关键词： Femtocell

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Two novel noise estimation methods with low complexity for the OFDM system

Two novel noise estimation methods with low complexity for t...

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2010 International Conference on communications, Circuits and Systems, ICCCAS 2010

作者： Shen, Shanshan Long, Hang Kuang, Jinghua Zheng, Kan Wang, Wenbo Wireless Signal Processing and Network Lab. Beijing China Key Laboratory of Universal Wireless Communication Ministry of Education Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424482238

This paper presents two new noise estimation methods in the orthogonal frequency division multiplexing system, which are based on the channel estimation. In the traditional noise estimation method, the noise power is achieved with subtracting the pilot signal power from the total received power. While the first new noise estimation method can get the noise power easily by the difference of the adjacent channels. The second new method is the modification of the first method. Compared with the traditional method, the two new methods are effective on the calculation complexity. Simulation results demonstrate that the estimation accuracy of the two new methods are better than the traditional method. © 2010 IEEE.

关键词： Frequency estimation

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PERFORMANCE EVALUATION ON COEXISTENCE OF TD-SCDMA AND TD-HSDPA SYSTEMS

PERFORMANCE EVALUATION ON COEXISTENCE OF TD-SCDMA AND TD-HSD...

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2010 2nd IEEE International Conference on Network Infrasturcture & Digital Content(2010年第二届IEEE网络基础设施与数字内容国际会议 IC-NIDC 2010)

作者： Mugen Peng Jie Hu Huamu Li Bin Han Wenbo Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communicatio

Due to the imperfection of transmitter and receiver, Adjacent Channel Interference (ACI) can’t be completely avoided when two systems share the adjacent frequency band. This paper investigates the impact of ACI between TD-SCDMA and TDHSDPA systems operating in macro cell. In stimulation, smart antenna technology is employed and its performance is investigated. Furthermore, the key technologies, Adaptive Modulation and Coding (AMC) and Hybrid-Auto Repeat Request (HARQ) of TD-HSDPA, are taken into account to analyze the capacity loss in different interference scenarios. Finally, results and conclusions are given, and we give some useful suggestions for two systems coexisting deployment based on our results.

关键词： TD-SCDMA TD-HSDPA ACIR Capacity Loss Smart Antenna

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DESIGN OF HIGH-RATE UNEQUAL DIVERSITY SPACE-TIME CODE FOR MULTIMEDIA TRANSMISSION

DESIGN OF HIGH-RATE UNEQUAL DIVERSITY SPACE-TIME CODE FOR MU...

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2010 3rd IEEE International Conference on Broadband Network & Multimedia Technology(2010年第三届IEEE宽带网络与多媒体国际会议 IC-BNMT 2010)

作者： Yang Liu Yunchuan Yang Hui Zhao Wenbo Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communicatio

In order to support applications with different Quality-of-Service (QoS) requirements in Multimedia communication, this paper designs and investigates a kind of high rate unequal diversity (HRUD) code based on the quasi-orthogonal spacetime block code (QO-STBC) for transmission. This code can achieve high rate, and also provide unequal error protection for multiple layers simultaneously. When transmit antennas NT=2 , receive antennas NR=2 or 3 are deployed, according to the design strategy, we give two examples of HRUD codes. The code with rate of two can provide two different levels of diversity gain, and the code with rate of three can provide three different levels of diversity gain. The simulation results show that the proposed codes significantly outperform the V-BLAST system in terms of BER performance with the same transmit antennas or the same spectral efficiency.

关键词： QO-STBC QR decomposition high rate unequal diversity

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Block-Wise MIMO Detection with Near-Optimal Performance and Low Complexity

Block-Wise MIMO Detection with Near-Optimal Performance and ...

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WRI International Conference on communications and Mobile Computing, CMC

作者： Rongrong Qian 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

ISBN: (纸本)9781424463275

A block-wise MIMO detection scheme which reduces the search space greatly comparing with the ML detection but still achieves the near-optimal performance is proposed. The specific feature of the proposed detection scheme is that, the search space is reduced as much as possible before performing the exhaustive search, in other words, the required search space that is large enough to guarantee the acceptable performance is obtained in a search space pre-determination stage. Based on the output of ZF equalization, the metrics used for determining the reduced search space, which are the posterior probabilities in this paper, can be computed. According to the simulation results, the near-optimal performance can be obtained while the detection complexity is far less than that of the ideal ML detection.

关键词： MIMO Computational complexity Mathematical model AWGN Maximum likelihood estimation Power system modeling Maximum likelihood detection Additive white noise Detectors Mobile communication

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Outage Performance of Cooperative Protocol for Broadcast Services over Nakagami-m Fading Channel

Outage Performance of Cooperative Protocol for Broadcast Ser...

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IEEE Conference on wireless communications and networking

作者： Song Zhu Wenbo Wang Yang Liu 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)9781424463961;9781424463985

The conventional cooperative protocols have to face some problems in practical broadcast and multicast systems because feedback channel is unavailable. An adaptive cooperative relay protocol, which can be adopted in future broadcast systems, is proposed in this paper. The outage probability performance of this protocol is analyzed over Nakagami-m fading channel, and the asymptotic expression of outage probability for proposed protocol is derived. It is compared with the conventional Decode-and-Forward and Amplify-and-Forward protocols. A combination of numerical simulation and theoretical analysis, including the optimal numbers of relays and the impact on the system performance are further analyzed for different channel states. According to these results, the advantages and characteristics of this protocol are confirmed.

关键词： Broadcasting Fading Relays Multicast protocols Performance analysis Broadcast technology wireless communication communications Society wireless application protocol Diversity reception

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Performance Analysis of Secondary Users in Dynamic Spectrum Access under Interference Temperature Constraints

Performance Analysis of Secondary Users in Dynamic Spectrum ...

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International Conference on Computer and Information Technology (CIT)

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 order to fully utilize the scarce spectrum resources and improve the efficiency of wireless spectrum resource utilization, dynamic spectrum access is proposed as a solution. There are two kinds of dynamic spectrum access system, one is overlay dynamic spectrum, and the other is dynamic spectrum access under interference temperature constraints. In this paper, we use a three-dimensional Markov chain to model the dynamic spectrum access under interference temperature constraints, and analyze the performance of secondary users in the system. Two important parameters, i.e., secondary user interrupting probability and blocking probability are derived using the proposed model. The performance of secondary users in different dynamic spectrum access systems are analyzed and compared. The numerical results show that the performance of secondary users can be improved significantly in dynamic spectrum access under interference temperature constraints comparing to overlay dynamic spectrum access. Specially, the advantage of interference temperature constraints based dynamic spectrum access is more notable on the condition that there are not enough resources to provide to secondary users for access.

关键词： Interference Markov processes Analytical models wireless communication Frequency control Mathematical model Radio spectrum management

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Performance of 3GPP LTE-Advanced networks with Type I relay nodes

Performance of 3GPP LTE-Advanced networks with Type I relay ...

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International Conference on communications and networking in China (CHINACOM)

作者： Zhangchao Ma Yi Zhang Kan Zheng Wenbo Wang Muzi Wu Wireless Signal Processing and Network Laboratory Key laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications China

Relaying is expected to be one key element of the future cellular networks. This paper focuses on 3GPP LTE-Advanced network incorporated with Type I relay nodes. We first present the required radio resource management (RRM) framework which includes routing, resource partition and scheduling functions. Then two RRM strategies are suggested: one with the conventional cellular settings, the other with further consideration on the special interference environment with relay nodes (RN). We evaluate and compare the network performances through system-level simulations under different relay deployment patterns. The results show that the interference-aware scheme could boost the coverage range of the RN and provide better cell-edge throughput when the RN density is low. Moreover, when the RN number increased, a bottleneck effect caused by the limited backhaul link capacity is observed.

关键词： Relays Throughput Interference Resource management Routing signal to noise ratio Peer to peer computing

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Multi-cell channel estimation and multi-cell joint detection in TD-SCDMA system

Multi-cell channel estimation and multi-cell joint detection...

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IEEE International Conference on wireless communications, networking and Information Security (WCNIS)

作者： Xiang Zhang Wenbo Wang Shuping Chen Chunyi Wang Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

In Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, the Steiner algorithm is used to perform channel estimation for the serving cell based upon the midamble in each timeslot, and joint detection (JD) is employed to eliminate intra-cell interference for both uplink and downlink. However, since single-cell JD (SJD) only deals with intra-cell interference and is not able to cancel out inter-cell interference, the users on cell edge typically achieve much worse link performance than those near the base station. Therefore, multi-cell JD (MJD) is proposed to further mitigate inter-cell interference. In this paper, the performance of multi-cell channel estimation (MCE) and multi-cell joint detection (MJD) techniques for TD-SCDMA evolved downlink are investigated and analyzed. It is shown that minimum mean-square-error (MMSE) multi-cell channel estimator and MMSE multi-cell equalizer can reduce downlink block error ratio (BLER) for the users both on the cell center and on the cell edge.

关键词： Channel estimation Time division synchronous code division multiple access Downlink Interference signal processing algorithms Base stations Equalizers Bandwidth Time division multiple access Detectors

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Cross-layer performance analysis in cooperative relay networks with poission and self-similar traffic input

Cross-layer performance analysis in cooperative relay networ...

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IEEE International Conference on wireless Information Technology and Systems (ICWITS)

作者： Jing Xiao Xiaodong Ji Xing Zhang 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

In this paper, by many simulation measurements, we analyze and compare fully effects on network performance with Poisson traffic input of traditional SRD traffic flows and FBM traffic input of LRD traffic flows, in terms of tail distribution and packet loss probability of the queue length under the condition of infinite and finite buffer cache by adopting direct transmission (DT), amplify-and-forward (AF) and decode-and-forward (DF) transmissions for infrastructure based twohop relay wireless networks.

关键词： Relays Mathematical model Queueing analysis wireless networks Analytical models Fading Channel capacity

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