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Analysis of correlation between Ricean K-factor and vegetation density surrounding a CDMA mobile terminal CDMA移动终端周边植被密度与Ricean k因子的相关性分析
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407209
Erik Östlin, Hans-Jürgen Zepernick, Hajime Suzuki, A. Pollok
{"title":"Analysis of correlation between Ricean K-factor and vegetation density surrounding a CDMA mobile terminal","authors":"Erik Östlin, Hans-Jürgen Zepernick, Hajime Suzuki, A. Pollok","doi":"10.1109/ISWCS.2004.1407209","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407209","url":null,"abstract":"In this paper, the propagation measurements obtained by utilising the IS-95 pilot signal of a commercial CDMA mobile network in rural Australia are analysed regarding the small-scale fading characteristics. It is shown that for this environment, the characteristics can be described by the Ricean distribution, where the X-factor correlates with the clutter density in the vicinity of the mobile receiving antenna. The Ricean K-factor indicates the small-scale fading margin required in a link budget calculation scenario, where pessimistic modelling, assuming Rayleigh fading, would lead to unnecessary high base station transmitter power and possible interference problems. This analysis correlates the vegetation density variations near the mobile receiving antenna to the Ricean K-factor enabling the prediction of the small-scale fading characteristics.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132401821","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
Decision feedback equalization for a single carrier system with frequency domain equalization - an overall system approach 基于频域均衡的单载波系统决策反馈均衡——一种整体系统方法
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407202
H. Witschnig, M. Kemptner, R. Weigel, A. Springer
{"title":"Decision feedback equalization for a single carrier system with frequency domain equalization - an overall system approach","authors":"H. Witschnig, M. Kemptner, R. Weigel, A. Springer","doi":"10.1109/ISWCS.2004.1407202","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407202","url":null,"abstract":"The wireless radio channel makes powerful equalization structures necessary, where in particular non linear structures such as decision feedback equalizers are promising candidates. Although the theory of these equalizers seems to be well developed, it is pointed out in this paper that it is inevitable to characterize them in an overall system approach which includes processing complexity, channel characteristics, error propagation, modulation schemes, channel coding and others before comparing them to linear equalizer structures. To reduce the signal processing complexity, our investigations are based on a single carrier system with frequency domain equalization (SC/FDE) which carries out the feed-forward equalization in the frequency domain. Furthermore, the specific structure of SC/FDE allows a better performance as compared to the classical DFE equalizer structures by reducing the effect of error propagation.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126969650","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: 15
A new differential resource reservation protocol to support adaptive multimedia applications on heterogeneous networks 一种新的支持异构网络上自适应多媒体应用的差分资源预留协议
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407229
Costas Efthymiou, M. Barton, T. Farnham
{"title":"A new differential resource reservation protocol to support adaptive multimedia applications on heterogeneous networks","authors":"Costas Efthymiou, M. Barton, T. Farnham","doi":"10.1109/ISWCS.2004.1407229","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407229","url":null,"abstract":"The recent proliferation of mobile communications systems has gone unnoticed by none and the encapsulation of voice and data services within a single framework is imminent. Future applications and devices demands that full quality of service (QoS) flexibility be available to them at all times. QoS provision for mobile networks is a difficult affair with numerous research efforts abounding in this area. The instability of the radio channel makes bandwidth adaptation unpredictable; consequently a mechanism is needed that enables fast adaptation at the radio layer whilst allowing the network to follow this adaptation in its own way. We present an adaptive extension to RSVP, differential RSVP, which provides this mechanism. Features of this protocol include traffic specification with bandwidth granularity (for layered source coding applications) and independent frequency of adaptation for each node along a network path.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115745803","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
3G business prospects - analysis of western European UMTS markets 3G业务前景-西欧UMTS市场分析
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407247
J. Harno
{"title":"3G business prospects - analysis of western European UMTS markets","authors":"J. Harno","doi":"10.1109/ISWCS.2004.1407247","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407247","url":null,"abstract":"This paper introduces to techno-economic modeling and analysis of UMTS operator business case. In addition, it presents some results relating to factors such as delay in launch, price plans and levels, WLAN introduction, and infrastructure sharing.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130374782","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
Influence of people shadowing on bit error rate of IEEE802.11 2.4 GHz channel 人影对IEEE802.11 2.4 GHz信道误码率的影响
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407287
R. Mathur, M. Klepal, A. Mcgibney, D. Pesch
{"title":"Influence of people shadowing on bit error rate of IEEE802.11 2.4 GHz channel","authors":"R. Mathur, M. Klepal, A. Mcgibney, D. Pesch","doi":"10.1109/ISWCS.2004.1407287","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407287","url":null,"abstract":"Installations of IEEE 802.11-based wireless local area networks (WLANs) have been growing exponentially over the past two years due to their low cost and high-speed data rate capabilities. Although many organizations have started using WLANs, there are still few tools available that assist in the design of WLAN networks. As a result, the current deployment of WLAN networks remains ad-hoc in nature. The objective of the research reported here is to develop modeling tools for performance optimization of WLAN networks. In particular, we attempt to develop propagation models that can predict the signal strength and interference in a WLAN system by taking environment specific parameters into account such as the structure of the building, presence or absence of stationary obstacles, etc (COST231 Final Report, 1998). This paper investigates the influence of moving obstacles, such as people, on radio wave propagation inside a building and the effect on received signal quality, in particular the bit error rate in an IEEE802.11 2.4 GHz channel. Our findings suggest that the presence of moving obstacles, such as people, causes strong variations in the received signal, which seriously affects the quality of the received signal.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131079999","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: 25
Fully adaptive MODEM up to 1024 QAM for 26 GHz broadband fixed wireless access systems with mesh topology 全自适应调制解调器高达1024 QAM的26 GHz宽带固定无线接入系统与网状拓扑
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407217
S. Nomoto, M. Asano, Y. Ito, M. Nakamura, T. Abe
{"title":"Fully adaptive MODEM up to 1024 QAM for 26 GHz broadband fixed wireless access systems with mesh topology","authors":"S. Nomoto, M. Asano, Y. Ito, M. Nakamura, T. Abe","doi":"10.1109/ISWCS.2004.1407217","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407217","url":null,"abstract":"Broadband fixed wireless access (BFWA) systems operating above 17-GHz band are suitable for high-density deployment of high capacity wireless access infrastructure, while the radio link quality can suffer from rain attenuation especially in rainy climatic regions. In order to overcome the problem and enhance not only the reliability but also the total capacity of the system, the authors have proposed a multi-hop BFWA system with mesh topology. Its unique characteristics include the modulator/demodulator (MODEM) that can adaptively support QPSK, 16 QAM, 64 QAM, 256 QAM and 1024 QAM operation. It has the maximum transmission capacity of 52 Mbits/s per channel at 6.75 MHz symbol rate and attains 364 Mbits/s by multi-channel configuration over the entire 60-MHz bandwidth at 26-GHz band. This paper presents design and implementation of the MODEM together with various data including bit error curves that demonstrate the validity of the design and implementation. A one-year field experiment commenced in April 2004.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132042761","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
Performance enhancement analysis for a DS-CDMA system DS-CDMA系统的性能增强分析
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407208
K. Rizvi, Y. Chow, M. Ismail
{"title":"Performance enhancement analysis for a DS-CDMA system","authors":"K. Rizvi, Y. Chow, M. Ismail","doi":"10.1109/ISWCS.2004.1407208","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407208","url":null,"abstract":"This paper has addressed the impact of different interference cancellation algorithms - sequential interference cancellation (SIC) and parallel interference cancellation (PIC) - for various data rates and channel profiles that mainly focuses on the evaluation of the performance improvements that accrue from cancelling the common pilot channel's interference in terms of bit error rate performance for downlink applications of a CDMA system. With these advanced signal processing strategies pertaining to the frequency division duplexing (FDD) element of the UMTS terrestrial radio access network (UTRAN) specified by 3GPP, apriori knowledge of the cross-correlation properties of the spreading codes for interfering common signalling channels is utilised in reducing interference under time dispersive wireless channel conditions. Performance analysis, with its dependency on the quality of the channel estimate, emphasises the potentiality of these interference cancellation schemes and their robustness against channel estimation errors.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"320 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132139860","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 CSMA/CA-based medium access scheme for array antenna-enhanced wireless ad hoc networks 一种基于CSMA/ ca的阵列天线增强无线自组网介质接入方案
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407243
T. Hunziker, J. Bordim, T. Ohira, S. Tanaka
{"title":"A CSMA/CA-based medium access scheme for array antenna-enhanced wireless ad hoc networks","authors":"T. Hunziker, J. Bordim, T. Ohira, S. Tanaka","doi":"10.1109/ISWCS.2004.1407243","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407243","url":null,"abstract":"We devise an incorporated medium access and beamforming scheme for packet-oriented, array antenna-enhanced ad hoc networks with time-division duplexing. The RTS-CTS-data-ACK type of channel access scheme adheres to a CSMA/CA (carrier sense multiple access / collision avoidance) policy. The beamforming is performed at both the packet sender and receiver at the beginning of a packet transmission, exploiting reciprocity of the MIMO (multiple-input/multiple-output) channels, thereby evading the complexity of instantaneous adaptive beamforming. In simulations we find that with the proposed technique the density of the concurrent single-hop packet transmissions in multi-path fading environments increases roughly linearly with the number of antennas per transceiver.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132260695","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
Trunked radio systems: traffic prediction based on user clusters 集群无线电系统:基于用户集群的流量预测
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407212
Hao Chen, L. Trajković
{"title":"Trunked radio systems: traffic prediction based on user clusters","authors":"Hao Chen, L. Trajković","doi":"10.1109/ISWCS.2004.1407212","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407212","url":null,"abstract":"Studies of individual network users' behavior patterns may seem of little relevance to predicting the entire network's traffic. Clustering techniques, however, help bridge this apparent gap. In this paper, we analyze data collected from a deployed network and use clustering techniques to characterize patterns of individual users' behavior. A network traffic prediction approach is then developed based on user clusters. We analyze three months of continuous network log data from the E-Comm network, an operational trunked radio system. After extracting traffic data from the raw data logs, we identify user clusters by employing the AutoClass tool and the K-means algorithm. Based on the identified user clusters, we use the seasonal autoregressive integrated moving average (SARIMA) model to forecast the network traffic by aggregating the predicted traffic of each user cluster. The predicted network traffic shows good agreement with the collected traffic data.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121643946","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: 28
The effects of packet reordering in a wireless multimedia environment 无线多媒体环境中数据包重排序的影响
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407288
C. M. Arthur, D. Girma, D. Harle, Andrew Lehane
{"title":"The effects of packet reordering in a wireless multimedia environment","authors":"C. M. Arthur, D. Girma, D. Harle, Andrew Lehane","doi":"10.1109/ISWCS.2004.1407288","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407288","url":null,"abstract":"Packet reordering has been shown to be an ever-increasing phenomenon on the Internet and must be taken into account when considering performance analysis of both fixed, wireless and mixed media networks. Previous work (J. Bennet et al., 1999) has demonstrated that TCP suffers degraded performance in situations of high packet reordering. This paper will consider why video traffic over UDP also performs badly in situations of high packet reordering, due to the temporal inter-packet dependencies introduced by the MPEG video encoding structure. Wireless networks are especially prone to problems due to the higher levels of link layer retransmissions found in noisy wireless environments. An experimental investigation into the effects of video packet reordering using the Windows Media streaming system is presented. A method for invoking packet reordering is introduced, and a tool for client-side measurements of video quality is presented. Typical measurements of video performance undergoing reordering are shown, with a study of buffering occupancy at the client, and the potential impact this could have on video packet reordering demonstrated.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121787603","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: 10
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