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Analysis of spectrum channel assignment for IEEE 802.11b wireless LAN IEEE 802.11b无线局域网频谱信道分配分析
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088343
Jinah Park, Seungkeun Park, Pyung-Dong Cho, K. Cho
{"title":"Analysis of spectrum channel assignment for IEEE 802.11b wireless LAN","authors":"Jinah Park, Seungkeun Park, Pyung-Dong Cho, K. Cho","doi":"10.1109/WPMC.2002.1088343","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088343","url":null,"abstract":"The paper analyzes the channel assignment of IEEE 802.11b wireless LANs operated on the 2.4 GHz ISM band. The tests used to analyze the radio interference between wireless LAN channels are divided into a cable RF test and a radiated RF test. The measurements for the radiated RF test were performed in an office and a hotel conference room. The measurement results show that the performance of a wireless LAN varies greatly with the model. The adjacent channel gain margin between channels 6 and 10 is about 23 dB and that for channels 10 and 11 is about 7 dB. The coupling effect of wireless LANs causes a maximum throughput reduction of 2 Mbps. The interference effect of the conventional 3-channel separated channel and that of the 4-channel separated channel show very different results according to the installation environment. These result are attributed to the fact that the adjacent channel gained a margin of about 7 dB between channels 10 and 11 and cannot cover the impact by the location and observation of wireless LANs and the deviation of the antenna coupling effect. Therefore, the channel separation of either 3 or 4 for APs on a co-site is suitable, but it has been judged to depend on the performance and installation environment of each wireless LAN.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134521305","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: 22
COPS based management for the UMTS multimedia domain 基于COPS的UMTS多媒体域管理
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088232
K. Cardoso, M. G. Genet, D. Zeghlache
{"title":"COPS based management for the UMTS multimedia domain","authors":"K. Cardoso, M. G. Genet, D. Zeghlache","doi":"10.1109/WPMC.2002.1088232","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088232","url":null,"abstract":"The paper presents the use of the common open policy service (COPS) protocol for third generation mobile network management. Following a brief introduction of COPS and the UMTS network, the COPS applications that have been developed to achieve call control in the multimedia domain and configuration management in simulated UMTS network entities are presented.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134342977","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
Theoretical BER analysis of OFDM systems with ICI self-cancellation 具有ICI自抵消的OFDM系统的理论误码率分析
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088326
Y. Fu, C. Ko
{"title":"Theoretical BER analysis of OFDM systems with ICI self-cancellation","authors":"Y. Fu, C. Ko","doi":"10.1109/WPMC.2002.1088326","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088326","url":null,"abstract":"Frequency offset is a common problem in orthogonal frequency-division multiplexing (OFDM) systems. This causes the orthogonality between subcarriers to be lost and results in intercarrier interference (ICI). A promising ICI self-cancellation scheme has been proposed (see Zhao, Y. and Haggman, S.-G., IEEE Trans. Commun., vol.49, no.7, p.1185-91, 2001) to reduce the effect of frequency offset error. The performance of the scheme, however, has not been fully analyzed. We analyze a theoretical performance of OFDM systems with ICI self-cancellation, where the ICI is treated as Gaussian noise. A tight bit error rate (BER) upper bound expression is derived and verified by simulation results.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130766942","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
Sequence assignment of Walsh-Hadamard sequences for quasi-synchronous multi-code CDMA systems 准同步多码CDMA系统Walsh-Hadamard序列的序列分配
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088259
M. Saito, H. Yamamoto
{"title":"Sequence assignment of Walsh-Hadamard sequences for quasi-synchronous multi-code CDMA systems","authors":"M. Saito, H. Yamamoto","doi":"10.1109/WPMC.2002.1088259","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088259","url":null,"abstract":"In this study, we propose the sequence assignment of Walsh-Hadamard sequences suitable for quasi-synchronous multi-code transmission. One of the important properties of proposed sequences is that any sequences in a sequence set have zero even cross-correlation with any sequences in another set for any time difference. By using the proposed sequences, the BER performance is significantly improved compared with that by conventional sequences with less number of interferences. Moreover, even if all (N) sequences are used simultaneously by different users, a practical BER performance is obtained. Although the proposed sequences have good cross correlation properties, the auto-correlation properties may be worse than general spreading sequences. Therefore, some devices to overcome the effect of multipath fading should be necessary for practical use in mobile radio environment.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131056717","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
Adaptive channel coding schemes using finite state machine for software defined radio 软件无线电有限状态机自适应信道编码方案
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088334
K. Ikemoto, R. Kohno
{"title":"Adaptive channel coding schemes using finite state machine for software defined radio","authors":"K. Ikemoto, R. Kohno","doi":"10.1109/WPMC.2002.1088334","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088334","url":null,"abstract":"The paper proposes and investigates a coding and decoding scheme to achieve adaptive channel coding using a finite state machine (FSM) for software defined radio (SDR). Adaptive channel coding and decoding systems that can switch between different coding rates and error correcting capabilities in order to adapt to changing applications and environments, are effective for SDR. However, in these systems, a receiver cannot always select the correct decoder which causes decoding errors, usually referred to as decoder-selection-errors (DSE). We propose a trellis encoder estimation scheme that compensates for this problem. This scheme uses the FSM circuit to limit the encoder transition and the Viterbi algorithm for maximum likelihood trellis encoder estimation. Computer simulations are applied for evaluating the DSE rate, the bit error rate (BER) and throughput of the proposed scheme in comparison with a conventional scheme.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127850708","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
Spatial multiplexing by spatiotemporal spreading of multiple symbol streams 利用多个符号流的时空扩展实现空间复用
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088262
A. Medles, D. Slock
{"title":"Spatial multiplexing by spatiotemporal spreading of multiple symbol streams","authors":"A. Medles, D. Slock","doi":"10.1109/WPMC.2002.1088262","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088262","url":null,"abstract":"The use of multiple transmitter and receiver antennas allows multiple signal streams to be transmitted in parallel and hence communication capacity to be increased. To distribute the multiple signal streams over the MIMO channel, linear space-time codes have been shown to be a convenient way to reach high capacity gains with a reasonable complexity. We propose an approach based on spatial spreading and delay diversity, hence spatiotemporal spreading, for channels with delay spread (frequential fading). The approach allows full symbol rate transmission (and hence full capacity) and permits full spatiotemporal diversity. The spatial spreading codes are optimized for minimum pairwise error probability (maximum coding gain). Some optimal and suboptimal receiver schemes are also discussed.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"601 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131646839","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
Solutions for GSM narrowband deployment GSM窄带部署解决方案
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088297
A.L. Rivada, P. Tapia, R. Cruz, J. Gallango
{"title":"Solutions for GSM narrowband deployment","authors":"A.L. Rivada, P. Tapia, R. Cruz, J. Gallango","doi":"10.1109/WPMC.2002.1088297","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088297","url":null,"abstract":"The outstanding performance of GSM and its promising evolution towards 3G services have oriented new operators to bet for this technology to deploy their mobile communication networks. However, the spectrum is a scarce resource and some new networks have to be initially deployed with a bandwidth lower than 5 MHz. Moreover, the inherent characteristics of GSM make the deployment a bit difficult due to the loose reuses normally required for BCCH frequencies. This paper presents results and conclusions of a study that aims at providing basic guidelines to deploy narrowband networks and achieve the maximum spectral efficiency with a very limited bandwidth. A network simulator and some trial results have been used during the study.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127899557","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
Load balancing in WCDMA systems by adjusting pilot power 通过调节导频功率实现WCDMA系统的负载平衡
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088315
Houtao Zhu, T. Buot, Rin Nagaike, S. Harmen
{"title":"Load balancing in WCDMA systems by adjusting pilot power","authors":"Houtao Zhu, T. Buot, Rin Nagaike, S. Harmen","doi":"10.1109/WPMC.2002.1088315","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088315","url":null,"abstract":"This paper investigates the load balancing technique that relieves the excessive load of hot-spot cells by coordinating the transmission powers of the pilot channels in WCDMA systems. A theoretical analysis is undertaken based on the mechanisms behind the load balancing technique. In addition the reasons behind the capacity gain and loss as a result of tuning of pilot power are studied. Then this paper proposes the metrics (key performance indicators) for studying the load balancing. A dynamic WCDMA simulator is utilized to investigate the effectiveness of this metrics and also the impact of power adjustment of common pilot channel (CPICH) on the whole WCDMA network performance. The dynamic simulation results show that this load balancing technique by adjusting CPICH power reduces the average base station power, improves the network stability and call qualities.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130603804","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: 46
Reduced linear decorrelator for multipath interference rejection in CDMA 用于CDMA多径干扰抑制的简化线性去相关器
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088260
Sok-Kyu Lee, K. Chang
{"title":"Reduced linear decorrelator for multipath interference rejection in CDMA","authors":"Sok-Kyu Lee, K. Chang","doi":"10.1109/WPMC.2002.1088260","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088260","url":null,"abstract":"A reduced linear decorrelator with very low correlation matrix dimension is proposed. The number of operation of inversed correlation matrix for the proposed detector is reduced and its performance is increased. The simulated results are compared with conventional linear decorrelator.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114499208","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
Synchronization for carrier frequency offset in wireless LAN 802.11a system 无线局域网802.11a系统中载波频偏的同步
The 5th International Symposium on Wireless Personal Multimedia Communications Pub Date : 2002-12-16 DOI: 10.1109/WPMC.2002.1088345
C. Peng, Kuel-Ann Wen
{"title":"Synchronization for carrier frequency offset in wireless LAN 802.11a system","authors":"C. Peng, Kuel-Ann Wen","doi":"10.1109/WPMC.2002.1088345","DOIUrl":"https://doi.org/10.1109/WPMC.2002.1088345","url":null,"abstract":"The paper describes a synchronization method for carrier frequency offset (CFO) in the IEEE 802.11a wireless LAN system, which adopts OFDM-based transmission techniques and provides several different transmission data rates up to 54 Mbit/s. The algorithm proposed provides an acquisition and a tracking stage for CFO estimation and compensation. After the processes of synchronizer and equalizer, error vector magnitude is used to evaluate the system's performance under both AWGN and multipath fading channels. According to the simulation results, the algorithm resolves CFO problems efficiently with reasonable complexity.","PeriodicalId":420635,"journal":{"name":"The 5th International Symposium on Wireless Personal Multimedia Communications","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115080536","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: 14
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