{"title":"Design of low power CMOS band-pass Gm-C filter for 5.8 GHz RF transceiver of ETC system","authors":"Yan Li, Hang Yu, Lai Jiang, Zhen Ji","doi":"10.1109/ICCT.2010.5689013","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689013","url":null,"abstract":"Since electronic tolling collection (ETC) allows vehicles passing through without slowing down which improves greatly transportation efficiency, it is chosen as the basic technology for new national highway network construction. The key component of the ETC system is a 5.8 GHz RF transceiver that enables wireless communication between toll booth and vehicles. A 1-V Gm-C sixth order band pass filter is designed in a 0.18 mm CMOS process for this purpose. Based on a pseudo differential operational transconductance amplifier (OTA), a wide tuning range and large input voltage swing is achieved. A common-mode feed forward (CMFF) circuit is introduced to reduce the distortion caused by common mode signal. The filter is implemented as a cascade of three identical second-order blocks. The power consumption is about 456 µW.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126106526","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}
Jae-Seon Yoon, Hyoung-Muk Lim, Hyun-Jin Park, Hyoung-Kyu Song
{"title":"Performance evaluation of cooperative communication for OFDMA based wireless communication system","authors":"Jae-Seon Yoon, Hyoung-Muk Lim, Hyun-Jin Park, Hyoung-Kyu Song","doi":"10.1109/ICCT.2010.5688640","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5688640","url":null,"abstract":"Recently, the orthogonal frequency-division multiple access (OFDMA) based wireless communication system is usually used in interactive digital video broadcasting environments or the wireless metropolitan area network (WMAN). Therefore, the relative condition of the inter-user channel can be easily deteriorated. This paper proposes and evaluates the mutual amplify-and-forward (AF) cooperative communication between two users using modified space time block code (STBC) to provide the reliability for an OFDMA system with a single antenna in an inferior inter-user channel environment. As the results, an OFDMA system adopting the proposed cooperative communication is more robust to the inferior inter-user channel than the previous decode-and-forward (DF) cooperative communication.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"1 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120895790","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}
{"title":"Effective capacity limits of cognitive radio networks under peak interference constraint","authors":"Dong Li","doi":"10.1109/ICCT.2010.5689274","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689274","url":null,"abstract":"In cognitive radio networks, a cognitive user (CU) can share the same frequency band with the primary user (PU) as long as the interference introduced to the PU is below a given interference limit. In this paper, we study the performance limits of CU's effective capacity by taking the instantaneous quality of services (QoS) of the PU into consideration. Considering the case with either single or multiple primary receivers, we derive closed-form expressions for the effective capacity for both of the above scenarios. We further analyze the performance limits of the asymptotic capacity when the received signal bandwidth approaches infinity, and obtain the closed-form expressions by taking both single and multiple primary receivers into consideration. Numerical results are provided to confirm the effectiveness of our theoretical analysis.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121045341","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}
{"title":"Optimal adaptive bit loading and subcarrier allocation techniques for OFDM based cognitive radio systems","authors":"J. Tang, Y. Rahulamathavan, S. Lambotharan","doi":"10.1109/ICCT.2010.5688851","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5688851","url":null,"abstract":"We propose an integer linear programming based adaptive bit loading and subcarrier allocation technique for a cognitive radio network. The proposed technique considers interference leakage to and from multiple primary users and secondary users in order to optimise the throughput of the secondary network while keeping the interference to primary network below a specific value. The simulation framework explicitly considers baseband filter response of the primary network and its impact on the interference leakage to the secondary network.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124945158","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}
Wen‐Jun Lu, Ran Liu, Zhen-Yuan Zhang, Chong Pan, Hongbo Zhu
{"title":"Dual-band balanced antipodal dipole-slot antenna","authors":"Wen‐Jun Lu, Ran Liu, Zhen-Yuan Zhang, Chong Pan, Hongbo Zhu","doi":"10.1109/ICCT.2010.5689282","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689282","url":null,"abstract":"Design concept of a novel, dual-band balanced antipodal ultra-wideband antenna is proposed. The antenna is composed with a symmetrical dipole and balanced tapered slot radiators and can be directly integrated with differential microwave circuits. Operation principle and performance of the antenna, such as return loss, radiation patterns and gain, are simulated and analyzed. As will be presented, the impedance bandwidth of the antenna is from 2.4–2.5GHz and 5.1–12GHz. Stable omnidirectional and quasi-directional radiation patterns over the operation bandwidth can be achieved. This antenna should be useful for dual-band WLAN, 5.8GHz-band Radio Frequency Identification (RFID) and European-standard UWB applications.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114269784","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}
{"title":"Blind frequency offset estimation combine with decoder for BICM-OFDM system","authors":"Yongzhi Yu, Huinan Sun","doi":"10.1109/ICCT.2010.5689298","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689298","url":null,"abstract":"The combination of orthogonal frequency division multiplexing (OFDM) and bit-interleaved coded modulation (BICM) is known as an efficient technique to combat frequency selective channels. In BICM-OFDM systems, significant performance degradation can result from carrier frequency offset, which caused Inter Carrier Interference (ICI). Based on the analysis of the frequency offset in OFDM, a new blind frequency offset estimation algorithm which associates with the decoder is proposed. This algorithm needs only one OFDM symbol. The feedback information provided by BICM is regarded as virtual training sequence. Using the correlation between the feedback information and received signals, the frequency offset can be estimate. Furthermore, the precision of estimation could be improved by the feedback information provided by iterative decoder of BICM. The simulation results show that, the proposed algorithm efficiently estimates frequency offset after three iterations.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125324787","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}
{"title":"Cooperative spectrum sensing based on double threshold detection and Dempster-Shafer theory","authors":"Hongyu Chen, Jian Liu","doi":"10.1109/ICCT.2010.5689114","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689114","url":null,"abstract":"Cognitive radio is an effective way to improve the utilization of spectrum source. To improve the detection probability in cognitive radio, cooperative spectrum sensing has been proposed. In this paper, we propose a novel algorithm for cooperative spectrum sensing based on double threshold detection and Dempster-Shafer (D-S) theory. Double threshold is used in local detection, which makes the local decision more reliable. The data fusion center uses D-S theory to deal with the observation values that secondary users can't handle with by double threshold energy detection. Final decision is made by combining the results of local detection and data fusion. Simulation results show our proposed algorithm gives significant improvement in detection probability, while the false alarm rate is reduced.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127553911","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}
{"title":"Changes in users' preference of services at different time scales","authors":"Minjie Guo, Peng Liu, Fang Liu, Yuanyuan Qiao","doi":"10.1109/ICCT.2010.5689322","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689322","url":null,"abstract":"Because of possessing the huge superiority on selective services marketing [1], and that could bring tremendous research value, users' usage preference of network services is becoming an issue. But there was seldom research on changes in users' usage of network services at different time scales. In this paper, we investigated the changes in users' usage of network services at different time scales, and built an index system, which could be used to describe the relation of users' preference of network services at different time scales, included time scales, the extent of the changes in users' preference of network services, change point threshold for preference, change rate of users' preference of network services and etc. On this condition, in order to compare the similarities and differences of change rate for preference at different time scale and analyze the special points on change rate curve for preference, analysis and comparison of change rate for preference at different time scales and multiple change point threshold is necessary. The research results of this paper lay a foundation of research on selectivity marketing.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131591513","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}
{"title":"A novel ARQ protocol for OFDMA relay system based on network coding","authors":"Jia-nian Cao, Jietao Zhang, Guanding Yu, Aiping Huang","doi":"10.1109/ICCT.2010.5688564","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5688564","url":null,"abstract":"Network coding is a prominent technique to efficiently utilize system resources and improve throughput of wireless networks. In this paper, we design a network coded cooperative scheme in OFDMA based single relay system. By exploiting retransmission request from the destination, the relay has capacity of forwarding XOR-code between source information transmitted in different transmission periods, which combines the new source information and the required retransmission information. In our scheme, it is not necessary to allocate extra system resource (time slot or bandwidth) for retransmission. A mathematical model is established to analyze the system outage probability. The system throughput is compared between our approach and other two traditional ARQ protocols. Simulation results show that the proposed protocol is much more efficient to utilize the available bandwidth.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131604051","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}
{"title":"A novel channel estimation algorithm for 3GPP LTE downlink system using joint time-frequency two-dimensional iterative Wiener filter","authors":"Jinfeng Hou, Jian Liu","doi":"10.1109/ICCT.2010.5689239","DOIUrl":"https://doi.org/10.1109/ICCT.2010.5689239","url":null,"abstract":"The channel estimation algorithms are employed in 3GPP Long Term Evolution (LTE) downlink system to assist the coherent demodulation of Orthogonal Frequency Division Multiplexing (OFDM) symbols. Based on the comparison of several exiting different channel estimation algorithms, we propose a joint time-frequency two-dimensional iterative Wiener filter (IWF) channel estimation algorithm for 3GPP LTE downlink system. In this scheme, we first apply the linear minimum mean square error (LMMSE) algorithm based on singular value decomposition (SVD) for IWF in frequency domain, and then the values after the first filtering in frequency domain are used to achieve the second IWF in time domain. Comparing to the conventional algorithms, the channel estimation algorithm proposed by this paper brings up lower bit error rate (BER) and adds little computational complexity.","PeriodicalId":253478,"journal":{"name":"2010 IEEE 12th International Conference on Communication Technology","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126983530","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}