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Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications最新文献

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The performance of CDMA system using /spl pi//4-shift QPSK and /spl pi//2-shift BPSK with the nonlinearity of HPA 采用/spl pi//4移QPSK和/spl pi//2移BPSK对HPA非线性的CDMA系统性能进行了研究
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567443
Kumud Kashyap, T. Wada, M. Katayama, T. Yamazato, A. Ogawa
{"title":"The performance of CDMA system using /spl pi//4-shift QPSK and /spl pi//2-shift BPSK with the nonlinearity of HPA","authors":"Kumud Kashyap, T. Wada, M. Katayama, T. Yamazato, A. Ogawa","doi":"10.1109/PIMRC.1996.567443","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567443","url":null,"abstract":"We evaluate the bit-error rate performance of direct-sequence spread spectrum (DS/SS) system using /spl pi//4-shift QPSK and /spl pi//2-shift BPSK and observe the effect of the nonlinearity of the high power amplifier (HPA) of transmitters which occurs when the HPA is operated near its saturation region. The hard limiter is chosen as the example of the nonlinear amplifier and the numerical results are reported by using coherent as well as differential detection at the receiving end. With the employment of either /spl pi//4-shift QPSK or /spl pi//2-shift BPSK, the DS/SS signal is not much influenced by the nonlinearity of the HPA as the two modulation schemes have the advantage of nearly constant envelope.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132569101","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 compact pattern with maximized channel borrowing strategy for mobile cellular networks 移动蜂窝网络中具有最大信道借用策略的紧凑模式
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567410
L. Ortigoza-Guerrero, D. Lara-Rodríguez
{"title":"A compact pattern with maximized channel borrowing strategy for mobile cellular networks","authors":"L. Ortigoza-Guerrero, D. Lara-Rodríguez","doi":"10.1109/PIMRC.1996.567410","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567410","url":null,"abstract":"The compact pattern with maximized channel borrowing (CPMCB), a new dynamic channel assignment strategy (DCA), is proposed. This new DCA algorithm takes advantage of the compact patterns to decrease the blocking probability by always assigning a channel to a pattern that improves the system performance. Channel borrowing and channel reallocation strategies are also used to minimize the blocking probability of each cell of the system. In the case of nonuniform traffic the new strategy is shown to have an 8% more traffic carrying capacity than the borrowing with directional channel locking (BDCL) scheme at a blocking rate of 2%, and better performance than CP based DCA under heavy loads of nonuniform traffic. This without violating the interference constraints as the latter strategy does. The maximum number of channel reallocations is at most one, being this therefore another advantage over BDCL. Also, a new interference limited environment with real traffic conditions is used. Results for this scenario with the standards AMPS and IS-54 are included, which validate the better performance of CPMCB as well.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133215704","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: 8
Indoor micro cell area prediction system using ray-tracing for mobile communication systems 室内微小区面积预测系统采用光线追踪技术，用于移动通信系统
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567506
T. Imai, T. Fujii
{"title":"Indoor micro cell area prediction system using ray-tracing for mobile communication systems","authors":"T. Imai, T. Fujii","doi":"10.1109/PIMRC.1996.567506","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567506","url":null,"abstract":"In mobile communication systems, especially digital wireless PBX systems, it is very important to clarify the service area in case of indoor base stations. However it is very difficult to estimate the propagation characteristics accurately under these environments because the indoor components, ex. wall partition, etc., are not only positioned randomly, but also made from complex materials. An indoor micro cell area prediction system, which can be easily estimate the propagation characteristics using the ray-tracing method, is proposed and its system configuration and major performance are described.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115189211","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: 13
A low IF GMSK modem architecture with joint symbol timing recovery and frequency offset compensation 一种低中频GMSK调制解调器结构，具有联合符号时序恢复和频率偏移补偿
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567399
Yung-Liang Huang, Chia-Chi Huang
{"title":"A low IF GMSK modem architecture with joint symbol timing recovery and frequency offset compensation","authors":"Yung-Liang Huang, Chia-Chi Huang","doi":"10.1109/PIMRC.1996.567399","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567399","url":null,"abstract":"This paper records our work in developing a GMSK modem with joint symbol timing recovery and frequency offset compensation capability. The received RF signal is first down converted to a low IF and then converted to complex baseband by a digital complex sampler. This baseband signal is then frequency discriminated and passed through a digital filter which in fact performs a fast Fourier transform (FFT). In other words, we apply an FFT algorithm on the frequency discriminated baseband signal in order to estimate symbol timing error and frequency offset simultaneously. The frequency offset can be estimated from the DC component of the FFT and the symbol timing error can be estimated from the phase angle of the FFT at a specified frequency which is equal to an integral multiple of half the bit rate. These two estimated parameters are then used for symbol timing recovery and frequency offset compensation. The bit error rate (BER) performance of our GMSK receiver architecture is assessed for an AWGN channel by computer simulation.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115699937","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 beam steering technique for GSM/DCS1800/PCS1900 GSM/DCS1800/PCS1900下行波束引导技术
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567452
P. Zetterberg, P. L. Espensen
{"title":"A downlink beam steering technique for GSM/DCS1800/PCS1900","authors":"P. Zetterberg, P. L. Espensen","doi":"10.1109/PIMRC.1996.567452","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567452","url":null,"abstract":"We propose a technique for downlink beam steering in GSM, i.e transmission with multiple antennas at the base station. The objective is to reduce the downlink interference level and thereby enable capacity and quality enhancements. The simulation results indicates that the proposed technique generates less than 0.9 dB more interference (defined as the total amount of transmitted power given a certain power at the desired mobile), than the theoretical minimum, provided that the mean uplink C/I is better than -8 dB, and frequency hopping is applied.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114176722","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
Clustered-OFDM transmitter implementation 集群ofdm发射机实现
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.568445
B. Daneshrad, L. Cimini, M. Carloni
{"title":"Clustered-OFDM transmitter implementation","authors":"B. Daneshrad, L. Cimini, M. Carloni","doi":"10.1109/PIMRC.1996.568445","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.568445","url":null,"abstract":"An elegant means by which high-speed burst wireless transmission can be accomplished with small amounts of overhead is through a novel technique referred to as clustered-OFDM. By using OFDM modulation with a long symbol interval, this scheme overcomes the complex and costly equalization requirements associated with single carrier systems. Moreover, the need for highly linear power amplifiers typically required in OFDM systems is alleviated through the use of multiple transmit antennas combined with nonlinear coding. The clustering technique also leads to a natural implementation of transmit diversity. This paper reports on the implementation of a clustered-OFDM transmitter which was constructed using off-the-shelf components in a relatively short period of time. Despite the limitations associated with the prototyped system, it can deliver 7.5 Mbps and it is expected that this data rate could be easily tripled with existing technology. In addition to providing an introduction to clustered-OFDM, we describe the various architectural trade-offs which were made in order to reduce the hardware complexity of the boards as well as some experimental results showing the operation of the transmitter.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114802608","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: 29
Downlink channel assignment algorithms for packet-based wireless TDMA/FDMA networks 基于分组的无线TDMA/FDMA网络下行信道分配算法
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.568474
W. Tsuchiya, H. Morikawa
{"title":"Downlink channel assignment algorithms for packet-based wireless TDMA/FDMA networks","authors":"W. Tsuchiya, H. Morikawa","doi":"10.1109/PIMRC.1996.568474","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.568474","url":null,"abstract":"Uplink/downlink independent radio resource management is one solution for emerging multimedia wireless networks. This paper presents six downlink channel assignment algorithms for packet-based TDMA/FDMA systems. The goal is to minimize the channel setup delay while attaining high transmission quality. Computer simulations are used to evaluate system performance in terms of dropped packet ratio and average channel setup delay. Only the bursty voice traffic is considered for real-time transmission. Priority-based two-stage algorithms are found to provide good performance, where the first stage is the selection of carrier to be scanned, and the second stage is the selection of time-slot to be assigned. The effect of priority determination algorithms is also discussed.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"91 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123171843","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
FQPSK-2 high speed modem for infrared wireless LAN FQPSK-2高速红外无线局域网调制解调器
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.568426
R. P. Jiménez, J. A. R. Borges, David Ortega, V. M. Melián, M. J. Betancor
{"title":"FQPSK-2 high speed modem for infrared wireless LAN","authors":"R. P. Jiménez, J. A. R. Borges, David Ortega, V. M. Melián, M. J. Betancor","doi":"10.1109/PIMRC.1996.568426","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.568426","url":null,"abstract":"The design and evaluation of a modem prototype, based on FQPSK-2 modulation, is presented. Its main application is wireless infrared local area networks. The bit rate of this prototype is 2 Mb/s, but this magnitude can be taken up to 4.8 Mb/s just by substituting the quartz crystals on the oscillator and the A/D and D/A converters in the emitter low-pass filters of the receiver. The design is full-digital in order to allow its integration on a single chip. We have chosen FQPSK-2 modulation due to its high spectral efficiency (300% better than GMSK), robustness against jitter and the constant amplitude of its complex envelope. This permits the possibility of using non-linear amplifiers and reducing power consumption. This is the most important characteristic when the system is based on portable equipment, such as laptops. Finally, extensive experimental results are presented, and BER measurements of this prototype are also given.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124673787","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 analysis of a priority oriented multiple access mechanism for wireless PCS 面向优先级的无线pc多址机制的性能分析
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.567425
F. Khan, D. Zeghlache
{"title":"Performance analysis of a priority oriented multiple access mechanism for wireless PCS","authors":"F. Khan, D. Zeghlache","doi":"10.1109/PIMRC.1996.567425","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.567425","url":null,"abstract":"We analyze the performance of a priority oriented multiple access mechanism for wireless PCS. The scheme supports multiple services (including data transmission in ATM cell formats) to comply with future provisions in wireless networks. Numerical results are provided (through the definition of a multi-dimensional Markov chain model for the information slot queueing process) for the proposed technique which is called priority-based multiple access (PBMA). The overall access delay due to collision resolution and information slot allocation is also extracted from a comprehensive computer simulation. Finally, we set limits on the achievable multiplexing gains with priority-based bandwidth reservation schemes by considering an ideal scheduler for the information slot allocation.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124921257","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
Comparison of computational complexity of adaptive equalization and OFDM for indoor wireless networks 室内无线网络自适应均衡与OFDM计算复杂度的比较
Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications Pub Date : 1996-10-15 DOI: 10.1109/PIMRC.1996.568450
James McDonnell, T. Wilkinson
{"title":"Comparison of computational complexity of adaptive equalization and OFDM for indoor wireless networks","authors":"James McDonnell, T. Wilkinson","doi":"10.1109/PIMRC.1996.568450","DOIUrl":"https://doi.org/10.1109/PIMRC.1996.568450","url":null,"abstract":"The computational requirements are investigated of conventional decision-feedback adaptive equalization using the least-mean-square (LMS) algorithm and orthogonal frequency division multiplexing (OFDM). This comparison was initiated to determine the least computationally intensive way of countering multipath effects in indoor wireless networks. Data rates examined ranged from 10 Mbits/s to 100 Mbits/s. For these data rates it was found that OFDM presents a significantly lower computational burden.","PeriodicalId":206655,"journal":{"name":"Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114066805","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: 21
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