IET International Communication Conference on Wireless Mobile and Computing (CCWMC 2011)
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- Location: Shanghai, China
- Conference date: 14-16 Nov. 2011
- ISBN: 978-1-84919-505-8
- Conference number: CP589
- The following topics are dealt with: radio spectrum management; video coding; green communication; LTE; mobile radio; signal processing; cognitive radio; wireless ad-hoc sensor network; MIMO; OFDM; passive optical networks; mobile computing and ubiquitous computing.
1 - 20 of 110 items found
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Study of millimetre-wave generation based on optical frequency multiplication
- Author(s): Yan Ding ; Jun Zhu ; Wei-Dong Fang ; Xiao-Guang Ge ; Xiang Chen
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To meet the increasing capacity and mobility as well as decrease the costs in next-generation optical access networks, RoF technology is a promising technique in the emerging optical and wireless convergence network, mm-wave generation is a key technique to realize the convergence network. In this paper, existing optical mm-wave generation technologies are introduced, including direct modulation, optical heterodyning and external modulation. Associated with Shanghai University, a scheme based on Optical Frequency Multiplication employing a dual drive Mach-Zehnder Modulator (DD-MZM) is presented. The novel efficient technique does not require expensive high-frequency electrical equipment. Moreover, no optical filtering is used, which significantly reduces the cost.
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Combined multi-stage MMSE and ML multiuser detection for underdetermined MIMO systems
- Author(s): Kai Liu and S.S. Xing
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We propose a so-called combined multi-stage minimum mean-square error (MSMMSE-ML MUD) in the underdetermined MIMO systems communicating over Gaussian fading channels. In a MIMO system with M transmitting antennas, after multi-stage MMSE detection is operated for the first (M-T) users, ML detection is executed for the last T users, where the parameter T is adopted to adjust the detection complexity of the last users. Considering an underdetermined MIMO system communicating over Gaussian fading channels, simulation results shows that the proposed method has a higher BER performance than the MSMMSE operated in the system.
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An adaptive synchronization algorithm for non-contiguous OFDM cognitive radio systems
- Author(s): Xiao Zhou and Runhe Qiu
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As a primary way of data transmission in a large variety of cognitive radio systems, Non-Contiguous Orthogonal Frequency Division Multiplexing (NC- OFDM) is a specialized OFDM with non-contiguous sub-carriers. In general, an OFDM system is required to be strictly synchronized. However, one of the huge challenges is the synchronization for NC-OFDM because of the non-contiguous and unevenly distributed sub-carriers of uncertain number in the NC- OFDM. In this paper, we proposed an adaptive synchronization algorithm for NC-OFDM system. In the new scheme, the training sequence is produced adaptively from detected available sub-carriers, and timing metric for synchronization is determined by PN-modulation of the training sequence. The algorithm compensates the frequency offset due to the multi-path channel effect, and yields a single peak on timing metric. A satisfactory performance with regard to estimation on the timing and frequency offset, and to the bit error rate (BER) is shown by simulation.
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Orthogonal space-time block codes in MIMO-OFDM cognitive radio communication system
- Author(s): Xiaoli Yu and Runhe Qiu
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This paper describes the MIMO technology, cognitive radio technology as well as orthogonal space-time block codes. To take full advantages of these three techniques, we eventually combine them to form a new program. The cognitive link and the main link of MIMO system can be set multiple antennas. In the cognitive system, cognitive users can use the authorized free frequency band, thereby enhancing the utilization of spectrum resources, and the estimated channel information will be used for channel decoding. The orthogonal space-time block codes in MIMO system can provide multiple transmit/receive antennas' full diversity gain, minimizing the impact of multi- path fading and gaining better BER performance, increasing the digital transmission rate at the same time. Simulation results show that the cognitive radio communication system based on MIMO OSTBC has significantly improved the signal to noise ratio in comparison to normal un-coded system.
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Research on time synchronization of Class B LXI bus
- Author(s): Hui Shen ; Yutian Feng ; Gang Tan
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Based on the introduction of developments of LXI instruments, LXI instrument synchronization problem and triggering principle of IEEE1588, the causes of the synchronization are analyzed. A new synchronization algorithm of frequency compensation is proposed. The algorithm is effective in dynamic compensation. It is suggested that the algorithm should be implemented with FPGA device. With Quatus II, the dynamic compensation of the local clock is simulated and its validation is proved in the experiments. Finally the hardware implement of the whole system scheme with the dynamic compensation algorithm is proposed.
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GPU-based background generation method
- Author(s): Xu Zhang ; Bowei Wang ; Chenyao Geng
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Video processing is wildly used in traffic detection, and it needs a lot of process time of CPU. GPU computing is deeply parallelized and the performance of float-point computing is highly-efficient comparing with the traditional GPU. GPUs are also in cheap price. More and more video processing algorithms are going to add GPU support. This paper describes an effective image background generation algorithm and its GPU implementation. The performance of GPU-based background extraction method is presented. And some issues about its application are discussed as well.
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Adaptive weighted algorithm of cooperative spectrum sensing in cognitive radio networks
- Author(s): Liu Chuan-qing and Wang Zhi-ming
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The algorithm of cooperative spectrum sensing in cognitive radio networks can improve detection probability of frequency spectrum sensing while increase cost of control channel, How to reduce the cost control is one of the key technology of cooperative spectrum sensing. The adaptive mixed weighted algorithm of cooperative spectrum sensing in cognitive radio networks is proposed, the algorithm based on the signal-to-noise ratio of energy detector, and determine the contribution according to a detector signal-to-noise ratio, and allocate a relevant weighted value, reduce the invalid detection and transmission. Results show that the proposed algorithm is improved detection probability, meanwhile, the average number of bits is decrease, reduce perceived control channel overhead.
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Multiple view learning based on tabular data
- Author(s): Zhe Wang ; Zengxin Niu ; Jianhua Huang ; Daqi Gao
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Comparing with single-view learning algorithm, multi-view learning algorithm has more powerful classification performance. However, multi-view learning algorithm needs multiple source patterns. Features of those multiple source information must satisfy with some independent conditions. In most real world case, it is easier for us to gain single source patterns. So it will be necessary for us to design multi-view learning algorithms that are on the basis of single source patterns. In our previous research, we proposed a multi-view learning algorithm which is named MultiV-MHKS and found that MultiV-MHKS can efficiently improve the recognition rate in multi-view learning. In the paper, on the basis of MultiV-MHKS, we propose a novel classification method named MultiV-TMHKS, which adopts the tabularized data technique to matrixize single source patterns. By this multiviewization approach we can gain different kinds of matrixes that are used in different views and then design proper sub-classifiers in corresponding views. We come up with a new matrixizing method for multiple view learning which is based on single source patterns.
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Efficient resource allocation in cooperative cognitive radio networks: a coalitional game approach
- Author(s): Song-Wen Huang ; Yu-Wei Chan ; Feng-Tsun Orien ; Yeh-Ching Chung
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In this paper, we consider the resource allocation problem of cooperative spectrum sharing among multiple primary users (PUs) and multiple secondary users (SUs), where the PUs lease their spectrum to the SUs in a time-division manner while the SUs in return help the data transmission of the PUs by relaying. The PU's strategy is to decide a proper fraction of spectrum leasing time to SUs for maximizing its payoff, while the SU's strategy is to decide the proper power for relaying PUs' traffic, and for transmitting its own data so as to satisfy its payoff. We formulate the problem as a coalitional game with transferable utility (TU), and propose an algorithm to show the game converges to the solution concept (the core). We also show that the grand coalition formed by grouping all PUs and SUs is stable. Finally, we demonstrate in simulations the benefits of our proposed approach comparing to other approaches of power control.
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Local transparency technique for heart model from VTK
- Author(s): Yanan Wang ; Wanggen Wan ; Xueli Zhou ; Shuiling Mao ; Hui Li
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In the surgical operation, the catheter can be used to collect the point clouds data and do the ablation operation. Then we can get the three-dimensional heart reconstruction model from point clouds using the surface reconstruction algorithm in visualization system. Usually, the heart model is displayed opaquely in the visualization window and light can not go through the object. So doctors could hardly see the location of the catheter inside the model in real-time system. In addition, sometimes doctors have to observe the internal structure and the interested region in the model for clinical diagnosis and analysis. Therefore, it is necessary for us to do the transparency to meet the doctor requirement. Transparency can be generally divided into overall transparency and local transparency. Sometimes it is difficult for doctor to recognize the relative position between the catheter and the model surface from the overall transparency. Allowing for this reason, in this paper, we not only introduce the overall transparency, but also propose two ways to deal with the interest region transparency. All the methods are implemented on VTK platform.
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Bandwidth-efficient contention-free mechanism for wireless networks
- Author(s): Qian Liu ; Jing Tu ; Yongxin Yan ; K.K. Chai
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The employment of Distributed Coordination Function has caused a waste of bandwidth and time, which leading to unsatisfactory network performance of wireless LANs. In our proposed mechanism, access points (APs) are used for determining which terminal to transmit a frame according to a sorted node list, which avoids the collision and backoff. To guarantee the practicality of the proposed mechanism, changes are only made to APs while all terminals act in the same way as in existing mechanism. The realization is through flexible use and modification of some control and management frames. Simulation results demonstrate that the proposed mechanism can improve network performance of throughput and delay.
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A game theoretical approach of network selection algorithm in heterogeneous wireless networks
- Author(s): Meirong Chen ; Fan Li ; Junqing Wang
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The present complicated heterogeneous network environment is resulted from coexisting of many radio access networks. A very important issue is how to select mutually for users and networks under this condition to maximize each profit. The existed researches mainly analyzed in two angles, one is how to select an efficient and suitable network to access from the point of view of users, the other is how to select users to maximize the profit of the networks from the point of view of networks. However the analysis from either of those angles do not consider enough about mutual selection between users and networks, which may lead to sacrifice one's profit to get another one's optimization. A game theoretical approach of the network selection algorithm is proposed, in which the different requirements and targets of users and networks are considered synthetically. The approach guarantees the profit of both sides through obtaining stable matching by a matching game between users and networks. The simulation results show that the algorithm improves the satisfaction degree of networks/users compared with the algorithms based on user/network decision. Furthermore, the trade-off between the satisfaction degree of users and networks can be reached.
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Analysis and comparison of GNSS code tracking with different discriminators
- Author(s): X. Zhang ; H.L. Xu ; X.Q. Zhan
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Code tracking is an indispensible operation of a Global Navigation Satellite System (GNSS) receiver. This paper provides analytical expressions for tracking loop performances using quasi-coherent dot product discriminator under small error conditions. Expressions are derived for root mean squared tracking error for arbitrary Signal-in-Space (SIS) spectra, Gaussian noise and non-white interference. Theoretical expressions are compared with previous work and numerical results are provided to examine the effect of different discriminators, SIS modulation designs and types of interference.
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Blending two parametric curves on the sphere
- Author(s): Zhenghua Zhou and Wanggen Wan
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Two given curves can be blended to produce a new curve between the prescribed curves, blending method provide a transition from one curve to another and can give different degrees of smoothness at the endpoints of the blends. The methods of blending two parametric curves on the sphere are presented in this paper. First, we construct a space curve blending with the prescribed curves on the sphere by choosing appropriate polynomials functions. The expectant blending curves are achieved by projected onto the unit sphere along the radial direction. C0, C1, C2 curves blending formulas on the sphere are proposed respectively, Corresponding curve blending experimental results are also showed.
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The research and application of business-driven internet component integration
- Author(s): Bao Wang ; Hongming Cai ; Lihong Jiang
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In order to achieve rapidly developing application system, to adapt to mobile backstage development needs, this paper puts forward the method of developing application system based on business-driven internet component integration. First, we put forward the internet component business model. Then, the internet component integration development platform and the internet component integration process are described. Finally, we implement a business-driven internet component application system. Practice shows that business-driven internet component software development greatly improves the efficiency of mobile backstage development.
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A novel OFDM-PON architecture based on all-optical waveform and flat frequency comb generation for 100 GB/S optical access
- Author(s): Peng Jiang ; Yingxiong Song ; Wenxuan Han ; Lin Zhang
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OFDM-PON has been regarded as a promising solution for next generation PON-based access networks. Meanwhile, the released 40/100G Ethernet standard makes 100 Gb/s fiber transmission to be realized in the near future. We propose a novel OFDM-PON architecture based on all-optical waveform and flat frequency comb generation for 100 Gb/s optical access.
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RFID protocol based on random number and encryption hash
- Author(s): Qian Quan ; Guo Xiang ; Zhang Rui
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The features of the RFID system and the constraints of RFID devices may bring about various privacy problems. After analyzing some existing RFID protocols, this paper proposes a new protocol based on random number and encryption hash. A process of formal analysis is presented by using BAN logic; the security and the complexity of this protocol are compared with other typical ones. The messages in the protocol are encrypted by key, it makes the protocol can prevent from illegal reading, tracking, eavesdropping, spoofing and replay attack. Both theory and analysis show that this new protocol can ensure the security of RFID systems and keep low-cost.
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Analysis of multiple shared channel cooperative routing in OFDM based wireless networks
- Author(s): X. Chen ; A.D.S. Jayalath ; G. Munasinghe ; K. Ziri-Castro
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Diversity techniques have long been used to combat the channel fading in wireless communications systems. Recently cooperative communications has attracted lot of attention due to many benefits it offers. Thus co operative routing protocols with diversity transmission can be developed to exploit the random nature of the wireless channels to improve the network efficiency by selecting multiple cooperative nodes to forward data. In this paper we analyze and evaluate the performance of a novel routing protocol with multiple cooperative nodes which share multiple channels. Multiple shared channels cooperative (MSCC) routing protocol achieves diversity advantage by using cooperative transmission. It unites clustering hierarchy with a bandwidth reuse scheme to mitigate the co-channel interference. Theoretical analysis of average packet reception rate and net work throughput of the MSCC protocol are presented and compared with simulated results.
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The research of suppressing power interference in PLCC using ICA technology
- Author(s): Zeyu Wang and Shenglin Zhou
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This paper depicts the main noise interferences consisting in PLCC (power line carrier communication). It indicates that power interference may deeply affect communication performance. According to the mode of PLCC and its characteristics, experiments for suppressing power interference in the communication have been conducted on MATLAB platform using ICA (independent component analysis) technology. The results of experiments prove that this suppressing noise method can obtain good effect.
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Semi-blind channel estimation of MIMO-OFDM systems based on RBF network
- Author(s): Hao jie and Yang ling
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A Semi-blind channel estimation method of MIMO-OFDM systems based on RBF (Radial Basis Function) network is proposed in this paper, with the improved semi-blind cost function based on LS criterion, and using RBF network to substitute the function iteration. Then makes use of the improved PSO algorithm to optimize the parameter of RBF network, we also use the improved network to estimate the channel response. Finally, the simulation results show the advantages of RBF network when processing the problem of channel estimation.
