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2009 International Conference on Wireless Communications & Signal Processing最新文献

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A new beam-forming algorithm based on flank acoustic vector-sensor array sonar 一种基于侧面声矢量传感器阵列声纳的波束形成新算法
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371393
Guolong Liang, KaiXin Liu, Wangsheng Lin
{"title":"A new beam-forming algorithm based on flank acoustic vector-sensor array sonar","authors":"Guolong Liang, KaiXin Liu, Wangsheng Lin","doi":"10.1109/WCSP.2009.5371393","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371393","url":null,"abstract":"An algorithm of Bartlett beam-forming with null-forming weights is proposed based on acoustic vector-sensor array, which is located on or near the flank shell of a ship. The influence of shell's reflection to the spatial spectrum estimation is analyzed. The performance of this algorithm is examined in two simulation examples. It can suppress effectively one or several coherent noise sources from aft part of the ship. It gives high bearing resolution and results in left-right unambiguous DOA estimation in all directions. Furthermore, it won't cause grating lobes if space under-sampling took place and, hence, is very useful in practical engineering.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125286281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Adaptive Virtual Relaying MIMO Decode and Forward 自适应虚拟中继MIMO解码和转发
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371515
T. Kanakis, C. Litchfield, P. Rapajic
{"title":"Adaptive Virtual Relaying MIMO Decode and Forward","authors":"T. Kanakis, C. Litchfield, P. Rapajic","doi":"10.1109/WCSP.2009.5371515","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371515","url":null,"abstract":"Multi-antenna wireless communication systems exploit channel diversity otherwise not available in Single Input Single Output (SISO) channels. Implementation of wireless Multiple-Input Multiple-Output (MIMO) systems is problematic due to the large sized operational wavelengths over the small dimensionality of the mobile devices. An Adaptive Virtual Relaying MIMO (AV-RMIMO) technique shown in this paper that increases the channel capacity between two single-antenna equipped communication nodes. A Decode-and-Forward (DF) relaying scheme is used. AV-RMIMO-DF, benefits from the increased diversity of the Relaying MIMO channels and is applicable to mobile environments with no fundamental changes to the network topology. MMSE estimation via Adaptive MUD is used for node selection and recruitment to transform multiple single-antenna nodes into a single multi-antenna node. It is shown that AV-RMIMO-DF is capable of a theoretical spectral efficiency up to 16.7bits/s/Hz at an SNR of 30dB and BER up to 10-5 at an SNR of about 11.5dB.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125404587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A high speed low power pulse swallow frequency divider for DRM/DAB frequency synthesizer 用于DRM/DAB频率合成器的高速低功率脉冲吞频分频器
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371501
X. Lei, Zhigong Wang, Keping Wang, Xiaoxia Wang
{"title":"A high speed low power pulse swallow frequency divider for DRM/DAB frequency synthesizer","authors":"X. Lei, Zhigong Wang, Keping Wang, Xiaoxia Wang","doi":"10.1109/WCSP.2009.5371501","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371501","url":null,"abstract":"The implementation of a high-speed low-power pulse swallow frequency divider for a DRM/DAB frequency synthesizer, using a 0.18-μm CMOS technology, is described. The frequency divider employs a divide-by-32/33 dual-modulus prescaler, a five bits swallow counter, an 11 bits programmable counter, and a control circuit necessary for the time sequence and operation of the division. In the pulse swallow frequency divider, the divide-by-32/33 dual-modulus prescaler consists of a divider-by-4/5 and an asynchronous divider-by-8 frequency divider, the swallow counter and the programmable counter consist of static-logic fall edge-triggered DFFs. The structure is designed to reduce the power consumption. Post-simulated results show that the programmable divider's operation frequency is from 0.5 GHz to 3.5 GHz with a maximum power consumption of 3.01 mW at 1.8V power supply. The dimension of pulse swallow frequency divider is 270 μm×110 μm.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114273338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
PAR reduction in OFDM systems based on clipped power re-allocation 基于截断功率重分配的OFDM系统PAR降低
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371539
Wenchao Xu, Shuyang Yu
{"title":"PAR reduction in OFDM systems based on clipped power re-allocation","authors":"Wenchao Xu, Shuyang Yu","doi":"10.1109/WCSP.2009.5371539","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371539","url":null,"abstract":"One of the major drawbacks in Orthogonal Frequency Division Multiplexing (OFDM) is its high Peak-to-Average Power Ratio (PAR). Clipping and filtering is the simplest and most effective method to reduce PAR for OFDM. But clipping and filtering gives rise to serious distortion which seriously degrades the bit error rate (BER) performance. Mitigating the disadvantages while inheriting the advantages of clipping and filtering, a new scheme called clipping and clipped power re-allocation with filtering is proposed for PAR reduction in this paper. The proposed scheme re-allocates the clipped power to other low-power time-domain symbols in the same OFDM block to reduce the distortion. Simulation results show that the BER performance of the proposed scheme is much better than conventional clipping and filtering technique and the PAR performance is slightly better than clipping and filtering. Besides, the proposed scheme is compatible with existing OFDM standards since no changes are required in the receiver structure.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128235386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Does every bit need the same power? An investigation on unequal power allocation for irregular LDPC codes 是不是每一点都需要同样的能量?不规则LDPC码的不平等功率分配问题研究
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371640
Hanghang Qi, D. Malone, V. Subramanian
{"title":"Does every bit need the same power? An investigation on unequal power allocation for irregular LDPC codes","authors":"Hanghang Qi, D. Malone, V. Subramanian","doi":"10.1109/WCSP.2009.5371640","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371640","url":null,"abstract":"Irregular LDPC codes can have capacity-approaching performance with an iterative BP decoder under AWGN channel with BPSK modulation. Generally in BPSK modulation, every bit within the block has the same power. In this paper, we investigate unequal power allocation (UPA) using BPSK modulation for irregular binary LDPC codes. We show that constant power modulation need not lead to the best performance. With UPA we see gains of up to 0.25dB, with larger gains possible if the receiver knows the details of the UPA scheme. Optimal power allocation is shown to depend strongly on the codes in use. Our work demonstrates the promise of the UPA scheme for some irregular LDPC codes.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128620788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
On the prediction of time-varying channels in MISO beamforming systems MISO波束形成系统时变信道的预测
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371407
Lv Ding, Bin Jiang, Xiqi Gao
{"title":"On the prediction of time-varying channels in MISO beamforming systems","authors":"Lv Ding, Bin Jiang, Xiqi Gao","doi":"10.1109/WCSP.2009.5371407","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371407","url":null,"abstract":"This paper addresses the necessity of channel prediction in the time-varying channels. In a multiple input single output (MISO) system, transmit beamforming relies on the current channel knowledge, one solution is the use of feedback channel. In conventional scheme because of signal processing, propagation and channel-access protocols, channel knowledge often outdated for the the current use, so feedback delay is a major factor for the performance degradation in the time-varying channel. In this paper we utilize a Kalman-filter-based prediction method to overcome the feedback delay effect. Simulation results verify the effectiveness of the channel prediction scheme.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129044619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
A novel modulation scheme combining the advantages of CP-OFDM and TDS-OFDM 一种结合了CP-OFDM和TDS-OFDM优点的新型调制方案
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371481
Yi Xu, Xin Su, Yuanzhang Xiao
{"title":"A novel modulation scheme combining the advantages of CP-OFDM and TDS-OFDM","authors":"Yi Xu, Xin Su, Yuanzhang Xiao","doi":"10.1109/WCSP.2009.5371481","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371481","url":null,"abstract":"In this paper, a novel modulation scheme named time domain and frequency domain united orthogonal frequency division multiplexing (TFU-OFDM) is introduced. The main characteristic of TFU-OFDM is the joint time-frequency utilization of the pseudo-noise (PN) sequences as guard intervals in time domain and the inserted pilots in frequency domain. Simulation results and analysis show that compared with the cyclic prefixing orthogonal frequency division multiplexing (CP-OFDM) system, TFU-OFDM achieves faster and more reliable synchronization, and provides similar performance of channel estimation and equalization. On the other hand, compared with the time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system, TFU-OFDM provides the same synchronization performance, but the computational complexity of channel estimation and equalization is greatly reduced.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126935632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Statistical properties of the capacity of Rice channels with MRC and EGC 利用MRC和EGC研究水稻渠道容量的统计特性
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371578
G. Rafiq, Matthias Patzold
{"title":"Statistical properties of the capacity of Rice channels with MRC and EGC","authors":"G. Rafiq, Matthias Patzold","doi":"10.1109/WCSP.2009.5371578","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371578","url":null,"abstract":"In this paper, we have studied the statistical properties of the capacity of Rice channels for both maximal ratio combining (MRC) and equal gain combining (EGC) schemes. We have analyzed the effect of the number of diversity branches and the amplitude of the line-of-sight (LOS) components in the diversity branches on the statistics of the channel capacity. Specifically, we have derived analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of the capacity of Rice channels when using MRC and EGC. It is observed that if the number of diversity branches or the amplitude of the LOS components increases, then the mean channel capacity increases, while the spread and the ADF of the channel capacity decreases. The presented results are very helpful for wireless communication system designers to optimize the receiver design for the case when spatial diversity combining is employed.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123645470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
A non-cooperative power control game via new pricing in cognitive radio 基于新定价的认知无线电非合作功率控制博弈
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371540
Jing Sun, Qi-hui Wu
{"title":"A non-cooperative power control game via new pricing in cognitive radio","authors":"Jing Sun, Qi-hui Wu","doi":"10.1109/WCSP.2009.5371540","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371540","url":null,"abstract":"In this paper, power control problem in cognitive user is modeled as a non-cooperative game model. To improve the cognitive users' performance, this paper presents a new pricing function based on double-interference punishment (DIP) for non-cooperative power control game in a CDMA cognitive radio network. The model reduces the minimum Signal to Interference plus Noise Ratio (SINR) satisfied the requirement of system. The minimum SINR reduced can make the lower SINR user communicate with each other in the system. The existence, uniqueness of Nash Equilibrium (NE) for the proposed new utility function model is proved. Simulation results show that the game with the proposed pricing function can improve the performance of the cognitive user in the condition of maximum interference temperature constraint. And the game model guarantees the fairness of cognitive users at a certain extent.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121178072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Multi-constrained routing in wireless multimedia sensor networks 无线多媒体传感器网络中的多约束路由
2009 International Conference on Wireless Communications & Signal Processing Pub Date : 2009-12-31 DOI: 10.1109/WCSP.2009.5371712
Xin Yan, La-yuan Li, F. An
{"title":"Multi-constrained routing in wireless multimedia sensor networks","authors":"Xin Yan, La-yuan Li, F. An","doi":"10.1109/WCSP.2009.5371712","DOIUrl":"https://doi.org/10.1109/WCSP.2009.5371712","url":null,"abstract":"In this paper, we propose a novel routing model that can comprehensively depict multiple service requirements in multimedia sensor networks, and on the basis of this model, we design a new multi-constrained routing algorithm MCRA for multimedia communications. MCRA not only can provide end-to-end delay and packet loss ratio guarantees, but also can optimize and balance the energy consumption in sensor nodes. Compared to the congener algorithms, in MCRA, neither the acquisition of target location nor the route discovery requires any extra measurement equipment or coordinate system based on location message exchange. Besides, MAC differentiation service may optionally be applied in MCRA so as to differentiate forwarding priority levels for real-time and best-effort data in MAC layer. Theoretical analysis and simulation experiments are provided to validate our claims.","PeriodicalId":244652,"journal":{"name":"2009 International Conference on Wireless Communications & Signal Processing","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121188204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
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