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2009 International Conference on Advanced Technologies for Communications最新文献

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Performance of a 2×2 STTC-MIMO-OFDM in 800-MHz-band urban mobile environment 2×2 STTC-MIMO-OFDM在800mhz频段城市移动环境下的性能研究
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349374
T. Nakagawa, K. Mitsuyama, Kohei Kambara, T. Ikeda
{"title":"Performance of a 2×2 STTC-MIMO-OFDM in 800-MHz-band urban mobile environment","authors":"T. Nakagawa, K. Mitsuyama, Kohei Kambara, T. Ikeda","doi":"10.1109/ATC.2009.5349374","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349374","url":null,"abstract":"A 64-state 16-QAM space-time trellis code (STTC), which uses two transmitting antennas, is proposed and applied to a 2×2 MIMO-OFDM system for outdoor mobile transmission in the 800-MHz band. Although STTCs have been analyzed theoretically and the error performances have been simulated by many researchers, experimental results have rarely been reported. Therefore, we evaluated the performance of our 2×2 STTC-MIMO-OFDM in both a simulation and experiment in the 800-MHz-band urban mobile environment. As a result, excellent bit error rate (BER) performance obtained in the simulation was verified by the experiment.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133577878","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: 6
Joint subspace beamforming and space-time coding in wireless MIMO systems 无线MIMO系统中的联合子空间波束形成与空时编码
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349325
S. M. Razavi, H. Zamiri-Jafarian
{"title":"Joint subspace beamforming and space-time coding in wireless MIMO systems","authors":"S. M. Razavi, H. Zamiri-Jafarian","doi":"10.1109/ATC.2009.5349325","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349325","url":null,"abstract":"In this paper, we propose a new joint beamforming and space-time coding (STC) scheme for wireless multiple-input multiple-output (MIMO) systems based on block singular value decomposition (BSVD). By utilizing the BSVD, transmit and receive beamformers divide the MIMO channel into some decoupled MIMO subchannels, which have different sizes. Due to flexibility in dividing the MIMO channel and applying the STC to each MIMO subchannel independently, the system can be designed based on trade off between diversity, multiplexing and complexity. Combining the dominant subspace beamformer and Alamouti STC, which is developed based on one dimensional BSVD (1D-BSVD), can be considered as one approach. To evaluate the performance of the new approach, the bit error rate (BER) of the proposed joint beamforming and ST coding is compared with the BERs of the orthogonal space-time block codes (OSTBCs) and the quasi-OSTBCs (QOSTBCs) via computer simulations. The results show that the superior performance of the proposed approach.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124064385","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: 1
Study, design and fabrication of a L-band, high-power transmitter system using a combination method 采用组合方法研究、设计和制造l波段大功率发射机系统
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349580
Thanh Thuy Dang Thi, Tuan-Anh Vu, G. Bach
{"title":"Study, design and fabrication of a L-band, high-power transmitter system using a combination method","authors":"Thanh Thuy Dang Thi, Tuan-Anh Vu, G. Bach","doi":"10.1109/ATC.2009.5349580","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349580","url":null,"abstract":"This paper deals with the results of the study, design and fabrication of a L-band, high power transmitter system for a purpose of application in the national sovereignty identification coding system. As known, it is usually difficult to build a high power transmitter system from the low power components by combination technique. Here we present a design and fabrication of such a system by combination of components which amplify signals from 1W to 45W, and then to 200W. The 200W power amplifier is a module which combines power to the theoretical value. We utilized the Hybrid and Wilkinson bridges as the combination logics. The studies were carried out along with the simulink-study by Ansolf and ADS software for design and fabrication of logic circuits. The obtained results showed that the method is suitable for application in the national sovereignty identification coding system in Vietnam.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129660738","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: 0
Design of quasi-orthogonal space-time block codes for cooperative wireless relay networks over frequency selective fading channels 频率选择性衰落信道下无线中继网络的准正交空时分组码设计
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349436
Quoc-Tuan Vien, E. Hong
{"title":"Design of quasi-orthogonal space-time block codes for cooperative wireless relay networks over frequency selective fading channels","authors":"Quoc-Tuan Vien, E. Hong","doi":"10.1109/ATC.2009.5349436","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349436","url":null,"abstract":"This paper proposes a distributed quasi-orthogonal space-time block code (DQOSTBC) over frequency selective fading channels for amplify-and-forward cooperative wireless relay networks. The proposed DQOSTBC is designed to achieve maximal data rate, spatial diversity gain and full decoupling for a relay network with four active relays. These goals are obtained by precoding the received signals at each relay to form the quasi-orthogonal space-time block codes (QOSTBCs) as developed for multiple-input multiple-output systems. To avoid the intersymbol interference caused by the dispersive nature of frequency selective fading, the frequency domain equalizer is exploited in our design for low-complexity receiver. In addition, the simulation results prove that our design provides 4dB improvement in terms of bit error rate as a benefit of applying the QOSTBC to cooperative networks.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128071219","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
Cooperative communication with power allocation in downlink CDMA networks 下行CDMA网络中具有功率分配的协同通信
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349431
Mohammad Abdizadeh, H. J. Rad, A.F.M. Jafarnia
{"title":"Cooperative communication with power allocation in downlink CDMA networks","authors":"Mohammad Abdizadeh, H. J. Rad, A.F.M. Jafarnia","doi":"10.1109/ATC.2009.5349431","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349431","url":null,"abstract":"In this paper, we study the downlink of cooperative Direct-Sequence Code Division Multiple Access (DS-CDMA), where a set of Mobile Terminals (MT) are cooperating with the purpose of improving their downlink communications reliability with the Base Station (BS). In order to achieve the spatial diversity, a new cooperation scenario is proposed. Afterward, in addition to multiuser precoding, Maximum Ratio Combining (MRC) according to the Maximum Signal to Noise Ratio (MSNR) criterion at the destination is investigated. Then, the optimal transmission power control strategy under a fixed total power constraint is illustrated and analyzed. Compared with equal transmission power assignment where BS and cooperative terminals transmit with same power, the proposed power allocation strategy enables significant performance gain at the destination.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123166744","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: 0
On antennas of base-station for mobile communications 移动通信基站天线研究
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349445
Wenxun Zhang
{"title":"On antennas of base-station for mobile communications","authors":"Wenxun Zhang","doi":"10.1109/ATC.2009.5349445","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349445","url":null,"abstract":"With retrospect to the development trace of antenna of base-station for mobile communications, some inappropriate concepts are indicated for discrimination or correction, including the pattern synthesis, feeding of multi-penal antenna, polarization and anti-fading. Their actualized techniques are briefly pointed out","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"114 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113945576","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: 0
A novel AFC scheme with time diversity combining for helicopter satellite communications 一种新型直升机卫星通信时分集组合AFC方案
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349375
T. Kojima, Batmunkh Batbaatar, C. Batzorig, T. Fujino
{"title":"A novel AFC scheme with time diversity combining for helicopter satellite communications","authors":"T. Kojima, Batmunkh Batbaatar, C. Batzorig, T. Fujino","doi":"10.1109/ATC.2009.5349375","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349375","url":null,"abstract":"In helicopter satellite communications, the periodic blockage of received signal and the carrier frequency fluctuation are the most important problems. In this paper, we propose a novel automatic frequency controller (AFC) scheme with time diversity combining. The proposed AFC generates the frequency error signal based on the time diversity combined signal. The signal-to-noise power ratio (SNR) of the frequency error signal is therefore prevented from falling to zero even in the condition of signal blockage. The proposed AFC thus tracks and removes the carrier frequency fluctuation due to Doppler shift more exactly than the conventional one. Results of computer simulation show that the proposed AFC improves the SNR of the frequency error signal significantly. It is meant that the proposed AFC also improves both of the acquisition characteristics and jitter performance even in the severe environments of the helicopter satellite communications.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"75 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115077022","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: 5
An FSMC model for the ACM scheme with repetition coding in mobile WiMAX 移动WiMAX中具有重复编码的ACM方案的FSMC模型
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349484
D. Nguyen, Q. Nguyen, Xuan-Thang Vu
{"title":"An FSMC model for the ACM scheme with repetition coding in mobile WiMAX","authors":"D. Nguyen, Q. Nguyen, Xuan-Thang Vu","doi":"10.1109/ATC.2009.5349484","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349484","url":null,"abstract":"To protect vital control information from deep fades, repetition coding is recommended in mobile WiMAX. This paper considers repetition coding as a maximum ratio combining process and proposes an expression for the coding gain and its effect on BER. A 10- state finite state Markov channel (FSMC) model is also proposed for the implementation of the adaptive modulation and coding (AMC) scheme in mobile WiMAX to maximize its spectral efficiency in a Rayleigh fading environment.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131114408","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
Throughput and proportional fairness in cognitive radio networks 认知无线网络中的吞吐量和比例公平性
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349453
Waqas Ahmed, Jason H. Gao, Hong Zhou, M. Faulkner
{"title":"Throughput and proportional fairness in cognitive radio networks","authors":"Waqas Ahmed, Jason H. Gao, Hong Zhou, M. Faulkner","doi":"10.1109/ATC.2009.5349453","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349453","url":null,"abstract":"In this paper, we investigate the aggregate throughput and proportional fairness of two independent secondary user (SU) groups in a cognitive radio (CR) network. Using a continuous time Markov chain, the expression for the aggregate throughput as a function of traffic intensity, forced termination and blocking probabilities is derived. Furthermore, throughput loss of the individual SU groups is analyzed in terms of proportional fairness. The results show that as the difference between the service rates increases the fairness deviates from its ideal value and this unfairness cannot be countered by changing the arrival/access rate of SUs. For the fixed arrival rate of SU groups there exists an optimal service rate pair which maximize the aggregate throughput.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132497653","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
Localization of irregular Wireless Sensor Networks based on multidimensional scaling 基于多维尺度的不规则无线传感器网络定位
2009 International Conference on Advanced Technologies for Communications Pub Date : 2009-12-08 DOI: 10.1109/ATC.2009.5349333
P. H. Namin, M. Tinati
{"title":"Localization of irregular Wireless Sensor Networks based on multidimensional scaling","authors":"P. H. Namin, M. Tinati","doi":"10.1109/ATC.2009.5349333","DOIUrl":"https://doi.org/10.1109/ATC.2009.5349333","url":null,"abstract":"In many applications of Wireless Sensor Networks (WSN), it is crucial to know the location of sensor nodes. Although several methods have been proposed, most of them have poor performance in irregularly shaped networks. MDS-MAP is one of the localization methods based on multidimensional scaling (MDS) technique. It uses the connectivity information to derive the location of the nodes in the network. In presence of additional data such as estimated distances between adjacent neighbors, it can also enhance the localization precision. Since MDS-MAP uses the length of the shortest path as Euclidian distance between the nodes, it is sensitive to the shape of the network. In this paper we present MDS-MAP(I), a modified algorithm based on MDS-MAP which improves the localization task in irregular networks. The simulation results show that the algorithm is more reliable in various topologies and achieves a significant performance improvement upon existing method.","PeriodicalId":311235,"journal":{"name":"2009 International Conference on Advanced Technologies for Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123707501","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
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