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Design of high sensitivity GPS signal acquisition circuit with new frequency domain search strategy 基于新频域搜索策略的高灵敏度GPS信号采集电路设计
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158288
D. Zou, Wenjing Wang, Shuai Han, W. Meng
{"title":"Design of high sensitivity GPS signal acquisition circuit with new frequency domain search strategy","authors":"D. Zou, Wenjing Wang, Shuai Han, W. Meng","doi":"10.1109/ChinaCom.2011.6158288","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158288","url":null,"abstract":"In this paper a GPS signal acquisition circuit is designed based on FPGA and a new GPS signal frequency domain search strategy is proposed and implemented by combining the cyclic shift sweep and DDS sweep. The system frequency domain search speed is improved evidently. And TTFF (time to first fix) can be extremely reduced, with out to much extra hardware costs. As a result, the weak signal acquisition and fast acquisition could be achieved simultaneously. Through hardware testing the sensitivity of the system and the advantages of the new strategy in the search speed is validated.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127626322","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
Relay searching for Distributed Space-Time Coding in decentralized ad hoc networks 分布式自组网中分布式空时编码的中继搜索
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158172
Qiyi Caitian, Yongzhao Li, Xinbo Gao, Cheng Chen
{"title":"Relay searching for Distributed Space-Time Coding in decentralized ad hoc networks","authors":"Qiyi Caitian, Yongzhao Li, Xinbo Gao, Cheng Chen","doi":"10.1109/ChinaCom.2011.6158172","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158172","url":null,"abstract":"Space-Time Coding can effectively increase the communication capacity in multiple antenna systems. In case the terminals cannot be equipped with antenna arrays, Distributed Space-Time Coding (DSTC) can be applied to virtual MIMO channel which is constructed by several single-antenna terminals. A novel way of searching relays for DSTC based on decentralized ad hoc networks is proposed in this paper. The major merit of the new scheme is that the scope of selecting the cooperative relay node is far beyond the SISO transmission range. Thus more opportunities for cooperation are provided, even when the network density is low or the traffic is heavy. As a result, the transmission range is greatly extended without reducing the QoS. Besides, corresponding MAC and routing protocols are presented. Simulation results show that as compared with using SISO, end-to-end throughput of the network increases by 103.9%, while end-to-end latency is reduced by 87.6%.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131240203","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
Minimum neighbour with extended Kalman filter estimator (MINEK): Performance evaluation 最小邻域扩展卡尔曼滤波估计器(MINEK):性能评价
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158199
M. Drieberg, F. Zheng, R. Ahmad
{"title":"Minimum neighbour with extended Kalman filter estimator (MINEK): Performance evaluation","authors":"M. Drieberg, F. Zheng, R. Ahmad","doi":"10.1109/ChinaCom.2011.6158199","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158199","url":null,"abstract":"The recent emergence of high density wireless local area network (WLAN) deployments is a testament to both the insatiable demands for wireless broadband services and the ubiquity of WLAN technology. However, the increased capacity and extended coverage comes with a corresponding increase in contention and interference. These can cause a significant degradation in throughput unless an effective channel assignment scheme is employed. In an earlier work, we proposed a practical distributed channel assignment scheme for high density WLANs. The proposed minimum neighbour with extended Kalman filter estimator (MINEK) scheme maximizes throughput by selecting the channel with the minimum number of active neighbour nodes (nodes associated with interfering access points). The latter is estimated in-situ using an extended Kalman filter. In this paper, we present extensive performance evaluation of the MINEK scheme. Specifically, the scheme's performance is evaluated in terms of upper-bound performance, normalized density, non-saturated load, unequal load, fairness and scalability. Extensive packet-level simulations using OPNET have shown that the MINEK scheme not only provides significant throughput improvement when compared to other existing schemes but is also highly robust across various deployment scenarios.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128879076","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
A new improved MAC scheme: RM-MAC 一种新的改进MAC方案:RM-MAC
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158267
Wenbin Zhang, Xiaozong Yang, Shaochuan Wu
{"title":"A new improved MAC scheme: RM-MAC","authors":"Wenbin Zhang, Xiaozong Yang, Shaochuan Wu","doi":"10.1109/ChinaCom.2011.6158267","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158267","url":null,"abstract":"As a typical MAC layer salvaging scheme, MASA is applied to IEEE802.11 with constant bit rate. In Ad Hoc networks, the salvation character of this scheme improves the performance of the 802.11 MAC protocol. However, the IEEE802.11b with variable bit rate is widely used at present. Consequently, it is necessary to analyze the behavior of MASA in variable rate conditions. Based on the above idea, this paper proposes a new salvaging scheme called Relay Multi-rate MAC (RM-MAC), which is an integration of MASA and modified Receiver-Based AutoRate (RBAR). A two-dimensional markov model concerning this new scheme is established, and then simulation by NS2 is implemented. Both model analyzing and simulation results show that RM-MAC is superior to IEEE802.11 in aggregation throughput and average packet delay.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126701682","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
Design of fiber-optic CoMP and relaying for smart and broadband distribution networks 智能宽带配电网的光纤CoMP和中继设计
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158300
H. Otsuka, Yukihiro Sakamoto, A. Nakajima
{"title":"Design of fiber-optic CoMP and relaying for smart and broadband distribution networks","authors":"H. Otsuka, Yukihiro Sakamoto, A. Nakajima","doi":"10.1109/ChinaCom.2011.6158300","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158300","url":null,"abstract":"This paper presents fiber-optic microcell systems to facilitate coordinated multi-point transmission/reception (CoMP) and wireless relaying. The design of cyclic prefix (CP) in OFDM signal is discussed to clarify the allowable optical fiber length difference between micro-eNBs. Theoretical CNR performance is described for the two types of optical devices such as FP-LD and DFB-LD. Receiver sensitivity in uplink is pointed out as the overall system performance. Fiber-optic relay node (RN) is also proposed as one of Layer 1 relaying. The transmitting CNR and the link gain of RN are discussed. This strategy will play a role in realizing smart and broadband distribution networks such as LTE-advanced and beyond.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116670473","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
Multihop cooperative communication for vehicular ad hoc networks 车载自组织网络的多跳协作通信
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158228
Hangguan Shan, W. Zhuang
{"title":"Multihop cooperative communication for vehicular ad hoc networks","authors":"Hangguan Shan, W. Zhuang","doi":"10.1109/ChinaCom.2011.6158228","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158228","url":null,"abstract":"In this paper, we propose a cooperation-based multihop transmission scheme, path-based cooperative multihop relaying, tailored for vehicular ad hoc networks (VANETs). Compared to the two traditional multihop relaying schemes, non-cooperative multihop relaying and hop-based cooperative multihop relaying, the proposed transmission scheme is capable of reorganizing the delivery path if an outage happens in the transmission, thus adapting to the instantaneous channel condition and/or the frequently-changing network topology. The analytical results of end-to-end outage probabilities for the proposed transmission scheme and its two alternatives are derived and compared. Simulation results verify the accuracy of the analysis and show the effectiveness of the proposed transmission scheme in terms of reducing the end-to-end outage probability. A significant performance gain (13 dB) is observed in the simulation.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121577544","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
Interference sensing using CORAL Cognitive Radio platforms 使用CORAL认知无线电平台进行干扰传感
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158293
Rukhsana Ruby, S. Hanna, J. Sydor, Victor C. M. Leung
{"title":"Interference sensing using CORAL Cognitive Radio platforms","authors":"Rukhsana Ruby, S. Hanna, J. Sydor, Victor C. M. Leung","doi":"10.1109/ChinaCom.2011.6158293","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158293","url":null,"abstract":"Implementation of a theoretical idea into practice is the ultimate achievement of the researcher. This is especially desireable with Cognitive Radio, a field having an extensive theoretical background but where there is little in the way of practical equipment or systems which can be used to implement and demonstrate cognitive radio functionality. To overcome this deficiency, the Communications Research Centre has developed a platform which implements WiFi based cognitive radio networks and allows the study of such attributes as sensing, adaptation, and collaboration in a field environment. In this paper we discuss the operation of thisWiFi based cognitive radio technology, providing an overview of the components that led to its implementation, and detail how this technology is being used to gather sensed information in a WiFi interference environment. Such information is being used to design Cognitive Engines for the next generation of adaptive WiFi routers and cognitive WiFi femtocells that will augment cellular services to the home.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"6 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114037317","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
Resource allocation for MIMO-OFDM video transmission systems based on joint source-channel coding 基于信源信道联合编码的MIMO-OFDM视频传输系统资源分配
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158147
Chengwen Zhang, Xin Liu, Xuezhi Tan
{"title":"Resource allocation for MIMO-OFDM video transmission systems based on joint source-channel coding","authors":"Chengwen Zhang, Xin Liu, Xuezhi Tan","doi":"10.1109/ChinaCom.2011.6158147","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158147","url":null,"abstract":"To improve the performance of MIMO-OFDM video transmission systems on the limitation of wireless bandwidth and transmit power, we propose a resource allocation algorithm with joint source-channel coding (JSCC) based on H.264 video compression standard and RCPT channel coding. According to different thresholds of the average SNR of subchannels, the algorithm dynamically allocates the source coding parameters of video information and the channel coding parameters of RCPT, which realizes unequal error protection (UEP) for the video information of different importance. Through the bit and power allocation based on MQAM modulation and the subspace allocation based on beamforming technology for different subcarriers, it also makes full use of space-frequency domain resources. The simulation results indicate that the algorithm improves the adaptability of video transmission systems in different wireless environments and the effect of the video retrieval.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114054480","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
Performance analysize of joint processing of sidelobe suppression and PAPR reduction in NC-OFDM systems NC-OFDM系统副瓣抑制与PAPR降低联合处理的性能分析
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158129
Peng Wei, L. Dan, Jin Wang, Yue Xiao, Xu He, Shaoqian Li
{"title":"Performance analysize of joint processing of sidelobe suppression and PAPR reduction in NC-OFDM systems","authors":"Peng Wei, L. Dan, Jin Wang, Yue Xiao, Xu He, Shaoqian Li","doi":"10.1109/ChinaCom.2011.6158129","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158129","url":null,"abstract":"Sidelobe suppression and peak to average power ratio (PAPR) reduction are two main problems in NC-OFDM systems. The conventional research treat these two problems as two independent problems and our research focus on the general performance improvement in terms of the two problems. In this paper, the interactive impacts of these two issues are analyzed based on two joint processing models. Furthermore, the general performance of two models are all studied and compared through both theoretical analysis and numeric simulation, which shows that the joint processing models achieve general improvement on sidelobe suppression and PAPR reduction.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131136767","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
A downlink and uplink collision mitigation scheme for multi-user MIMO-based WLANs through relaying 基于中继的多用户mimo无线局域网下行和上行冲突缓解方案
2011 6th International ICST Conference on Communications and Networking in China (CHINACOM) Pub Date : 2011-08-17 DOI: 10.1109/ChinaCom.2011.6158208
Hu Jin, Jiyoung Cha, D. Sung
{"title":"A downlink and uplink collision mitigation scheme for multi-user MIMO-based WLANs through relaying","authors":"Hu Jin, Jiyoung Cha, D. Sung","doi":"10.1109/ChinaCom.2011.6158208","DOIUrl":"https://doi.org/10.1109/ChinaCom.2011.6158208","url":null,"abstract":"Collision mitigation is one of main research issues to improve the system performance in wireless local area networks (WLANs). Our previous study showed that our proposed multi-user multiple-input multiple-output (MIMO)-based collision mitigation scheme is very efficient for uplink throughput performance. However, for infrastructure-based WLANs, there still exists a downlink and uplink collision problem, since the multi-user MIMO-based collision mitigation scheme only can partially resolve uplink collisions. In order to mitigate this kind of collision, in this paper, we propose a relay-assisted downlink and uplink collision mitigation scheme and analyze the corresponding performance. Moreover, when it comes to the coexistence of the uplink and downlink traffic in WLANs, due to a random access nature of the WLAN systems, the access point (AP) may have less channel access opportunities than stations(STAs). Thus, we need to take into account a downlink and uplink throughput balancing problem. Numerical results show that the proposed scheme yields better throughput performance than the conventional multi-user MIMO-based collision mitigation scheme, especially when we consider the uplink and downink throughput balancing.","PeriodicalId":339961,"journal":{"name":"2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131572068","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
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