Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.476900
M. Naghshineh, M. Schwartz
The major focus of this paper is distributed call admission control in mobile/wireless networks the purpose of which is to limit the call hand-off dropping probability in loss systems or the cell overload probability in lossless systems. Hand-off dropping or cell overload are consequences of congestion in wireless networks. Our call admission control algorithm takes into consideration the number of calls in adjacent cells in addition to the number of calls in the cell where a new call request is made, in order to make a call admission decision. This is done by every base station in a distributed manner without the involvement of the network call processor. The admission rule is simple enough that the admission decision can be made in real time. Furthermore, we show that our distributed call admission control scheme limits the hand-off dropping or the cell overload probability to a predefined level almost independent of load conditions. This is an important requirement of future wireless/mobile networks with quality-of-service provisioning.
{"title":"Distributed call admission control in mobile/wireless networks","authors":"M. Naghshineh, M. Schwartz","doi":"10.1109/PIMRC.1995.476900","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.476900","url":null,"abstract":"The major focus of this paper is distributed call admission control in mobile/wireless networks the purpose of which is to limit the call hand-off dropping probability in loss systems or the cell overload probability in lossless systems. Hand-off dropping or cell overload are consequences of congestion in wireless networks. Our call admission control algorithm takes into consideration the number of calls in adjacent cells in addition to the number of calls in the cell where a new call request is made, in order to make a call admission decision. This is done by every base station in a distributed manner without the involvement of the network call processor. The admission rule is simple enough that the admission decision can be made in real time. Furthermore, we show that our distributed call admission control scheme limits the hand-off dropping or the cell overload probability to a predefined level almost independent of load conditions. This is an important requirement of future wireless/mobile networks with quality-of-service provisioning.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133811299","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.480911
S. Su, Shinn-Shyue Shieh
Power control (PC) is an important issue in the DS-CDMA cellular mobile radio system. For the IS-95 standard, the reverse-link PC strategy is based on fixed-step power change and it needs only one command bit per update. We call this strategy DM-PC. From the point of view of digital communication, ADM will have better performance with the same number of control bits compared to DM. So it appears to be a good idea to improve the DM-PC and be compatible with the current system as IS-95. However, the pure ADM-PC is not better than DM-PC from our earlier simulation results. Hence, we propose another PC strategy called modified ADM-PC. The simulation results show that it has better performance than DM-PC.
{"title":"Reverse-link power control strategies for CDMA cellular network","authors":"S. Su, Shinn-Shyue Shieh","doi":"10.1109/PIMRC.1995.480911","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480911","url":null,"abstract":"Power control (PC) is an important issue in the DS-CDMA cellular mobile radio system. For the IS-95 standard, the reverse-link PC strategy is based on fixed-step power change and it needs only one command bit per update. We call this strategy DM-PC. From the point of view of digital communication, ADM will have better performance with the same number of control bits compared to DM. So it appears to be a good idea to improve the DM-PC and be compatible with the current system as IS-95. However, the pure ADM-PC is not better than DM-PC from our earlier simulation results. Hence, we propose another PC strategy called modified ADM-PC. The simulation results show that it has better performance than DM-PC.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116322422","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.480922
A. Correia
Bandwidth expanding signaling with quasi-orthogonal short codes where the bandwidth expansion factor N/spl les/8, is considered. The evaluation of the average probability of error over channels with multipath induced intersymbol interference (ISI) (which model broadband indoor and outdoor millimeter wave radio propagation) is presented, for two different receivers. Namely the rake receiver with equal gain combining and the postdetection integrator. Both BFSK modulation with noncoherent demodulation and DPSK modulation are analysed.
{"title":"Spread-spectrum to combat multipath induced intersymbol interference","authors":"A. Correia","doi":"10.1109/PIMRC.1995.480922","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480922","url":null,"abstract":"Bandwidth expanding signaling with quasi-orthogonal short codes where the bandwidth expansion factor N/spl les/8, is considered. The evaluation of the average probability of error over channels with multipath induced intersymbol interference (ISI) (which model broadband indoor and outdoor millimeter wave radio propagation) is presented, for two different receivers. Namely the rake receiver with equal gain combining and the postdetection integrator. Both BFSK modulation with noncoherent demodulation and DPSK modulation are analysed.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122042150","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.477374
P. V. Rooyen, F. Solms
The Maximum Entropy (MaxEnt) method is used to evaluate the Inter User Interference (IUI) probability density function in a Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) system. This distribution is frequently assumed to be Gaussian distributed and is commonly known as the Gaussian Assumption (GA). By calculating the discrimination information (relative entropy) between the IUI-distribution, as inferred via the MaxEnt method, and a Gaussian distribution with equal second moments the Gaussian Assumption is quantified for the Nakagami-m faded channel. By altering the parameter m of the Nakagami-m distribution, the degree of fading can be varied and therefore the influence of fading on the Gaussian Assumption can be thoroughly investigated.
{"title":"Maximum entropy investigation of the inter user interference distribution in a DS/SSMA system","authors":"P. V. Rooyen, F. Solms","doi":"10.1109/PIMRC.1995.477374","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477374","url":null,"abstract":"The Maximum Entropy (MaxEnt) method is used to evaluate the Inter User Interference (IUI) probability density function in a Direct Sequence Spread Spectrum Multiple Access (DS/SSMA) system. This distribution is frequently assumed to be Gaussian distributed and is commonly known as the Gaussian Assumption (GA). By calculating the discrimination information (relative entropy) between the IUI-distribution, as inferred via the MaxEnt method, and a Gaussian distribution with equal second moments the Gaussian Assumption is quantified for the Nakagami-m faded channel. By altering the parameter m of the Nakagami-m distribution, the degree of fading can be varied and therefore the influence of fading on the Gaussian Assumption can be thoroughly investigated.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123977729","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.477079
A. Sandhu, T. Lo, H. Leung, J. Litva
In this paper, a Hopfield neural network is used to carry out adaptive beamforming with direct sequence spread spectrum signals. A reference signal generator is employed to derive the desired signal for the adaptive processor. A PN code is used to spread the data signal which is biphase modulated. At the receiver end, this code is used to extract the desired signal component from the array output and reject any narrowband interference signals. Simulations are carried out for %element linear and circular arrays. The performance of the neurobeamformer is evaluated in the presence of interference from directions very close to the desired signal. Simulations also include a scenario where a multipath signal impinges on the array.
{"title":"Hopfield neurobeamformer for spread spectrum communications","authors":"A. Sandhu, T. Lo, H. Leung, J. Litva","doi":"10.1109/PIMRC.1995.477079","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477079","url":null,"abstract":"In this paper, a Hopfield neural network is used to carry out adaptive beamforming with direct sequence spread spectrum signals. A reference signal generator is employed to derive the desired signal for the adaptive processor. A PN code is used to spread the data signal which is biphase modulated. At the receiver end, this code is used to extract the desired signal component from the array output and reject any narrowband interference signals. Simulations are carried out for %element linear and circular arrays. The performance of the neurobeamformer is evaluated in the presence of interference from directions very close to the desired signal. Simulations also include a scenario where a multipath signal impinges on the array.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125769945","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.477327
R. Malkemes, P. Lukander, P. Harrison
1. Abstract This paper presents a basic framework for the consideration of an integrated PACS and DCS1900 handset architecture. DCS1900 is a GSM based hightier system intended for use in the 1.9 GHz frequency allocation which can provide vehicular wireless service over very large areas. PACS is a low-tier system that can provide widespread pedestrian urban service with cost and quality that approach wireline. Similarities between both systems are highlighted for the purpose of offering both low and high-tier sets of features in a combined handset architecture. Mainly, lower layer RF issues are studied, but, channel coding, and voice coding issues are also considered. Market driven issues such as cost and user segments are also discussed. An estimate of the interoperable handset cost impact is also provided.
{"title":"An interoperable PACS and DCS1900 subscriber unit radio architecture","authors":"R. Malkemes, P. Lukander, P. Harrison","doi":"10.1109/PIMRC.1995.477327","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477327","url":null,"abstract":"1. Abstract This paper presents a basic framework for the consideration of an integrated PACS and DCS1900 handset architecture. DCS1900 is a GSM based hightier system intended for use in the 1.9 GHz frequency allocation which can provide vehicular wireless service over very large areas. PACS is a low-tier system that can provide widespread pedestrian urban service with cost and quality that approach wireline. Similarities between both systems are highlighted for the purpose of offering both low and high-tier sets of features in a combined handset architecture. Mainly, lower layer RF issues are studied, but, channel coding, and voice coding issues are also considered. Market driven issues such as cost and user segments are also discussed. An estimate of the interoperable handset cost impact is also provided.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124754262","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.480907
M. S. Ismail, T. A. Rahman
The effects of the propagation path loss coefficient (/spl gamma/) and power control on the forward-link frequency reuse efficiency (K) of a direct sequence code division multiple access (CDMA) cellular system is investigated. A simple analytical model is developed to express the interference received by a user in the home cell from other base stations based on the inverse power-of-distance /spl gamma/ law. Proper factors for optimum power control performance are estimated according to /spl gamma/. With these factors, K is improved to twice that without power control for /spl gamma/ between 4.5 and 2.5. The degradation in K as /spl gamma/ is increased is significantly less for CDMA than for the traditional FDMA and TDMA cellular systems.
研究了传播路径损耗系数(/spl gamma/)和功率控制对直接序列码分多址(CDMA)蜂窝系统前向链路频率复用效率(K)的影响。建立了一个简单的解析模型，以表示用户在家庭小区中从其他基站接收到的干扰，该模型基于逆距离幂/spl伽马/定律。根据/spl γ /估计最佳功率控制性能的适当因素。有了这些因素，在没有功率控制的情况下，/spl γ /在4.5和2.5之间，K提高到两倍。与传统的FDMA和TDMA蜂窝系统相比，CDMA的K as /spl γ /的衰减增加明显更少。
{"title":"Forward-link frequency reuse efficiency of power controlled CDMA cellular system","authors":"M. S. Ismail, T. A. Rahman","doi":"10.1109/PIMRC.1995.480907","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480907","url":null,"abstract":"The effects of the propagation path loss coefficient (/spl gamma/) and power control on the forward-link frequency reuse efficiency (K) of a direct sequence code division multiple access (CDMA) cellular system is investigated. A simple analytical model is developed to express the interference received by a user in the home cell from other base stations based on the inverse power-of-distance /spl gamma/ law. Proper factors for optimum power control performance are estimated according to /spl gamma/. With these factors, K is improved to twice that without power control for /spl gamma/ between 4.5 and 2.5. The degradation in K as /spl gamma/ is increased is significantly less for CDMA than for the traditional FDMA and TDMA cellular systems.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129832426","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.480931
H. Furukawa, Y. Akaiwa
High spectrum efficiency is promised by reuse partitioning in a cellular system. We propose an improved algorithm for self-organized reuse partitioning (SORP), a distributed dynamic channel assignment scheme, in order to obviate the need for broadcasting transmit power level information of each mobile terminal. The concept of the improved scheme is simple: a mobile terminal with low transmit power uses a low numbered channel throughout the system. Reuse partitioning can be achieved owing to such a channel segmentation. The algorithm is designed to realize the channel segmentation without the broadcasting of the transmit power level. Computer simulation results show that a high capacity and short delay time in finding an appropriate channel can be obtained. Furthermore, a higher capacity can be obtained by introducing quality based power control into this algorithm.
{"title":"A self-organized reuse-partitioning dynamic channel assignment scheme with quality based power control","authors":"H. Furukawa, Y. Akaiwa","doi":"10.1109/PIMRC.1995.480931","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480931","url":null,"abstract":"High spectrum efficiency is promised by reuse partitioning in a cellular system. We propose an improved algorithm for self-organized reuse partitioning (SORP), a distributed dynamic channel assignment scheme, in order to obviate the need for broadcasting transmit power level information of each mobile terminal. The concept of the improved scheme is simple: a mobile terminal with low transmit power uses a low numbered channel throughout the system. Reuse partitioning can be achieved owing to such a channel segmentation. The algorithm is designed to realize the channel segmentation without the broadcasting of the transmit power level. Computer simulation results show that a high capacity and short delay time in finding an appropriate channel can be obtained. Furthermore, a higher capacity can be obtained by introducing quality based power control into this algorithm.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128506012","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.480914
F. Danilo-Lemoine, H. Leib
In this paper we present single pulse performance of detection structures for fading multipath channels with common modulation formats such as FSK and DPSK. The multipath components are assumed to be unresolved, with known delays. These delays could have been estimated, for example, by sounding the channel with a pulse of much wider bandwidth than that of the information conveying signal. This paper shows that it is possible to have diversity-like gains over multipath fading channels with unresolved components even if the channel is not fully tracked. However the required SNR to achieve such diversity gains is highly dependent on the modulation formats. Properly designed receivers for unresolved multipath channels may reduce the SNR, where the diversity gains are achieved, and lower significantly the error floors. It is shown that a quadratic decorrelation receiver performs well over unresolved multipath channels.
{"title":"FSK and DPSK over unresolved multipath Rayleigh fading channels","authors":"F. Danilo-Lemoine, H. Leib","doi":"10.1109/PIMRC.1995.480914","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480914","url":null,"abstract":"In this paper we present single pulse performance of detection structures for fading multipath channels with common modulation formats such as FSK and DPSK. The multipath components are assumed to be unresolved, with known delays. These delays could have been estimated, for example, by sounding the channel with a pulse of much wider bandwidth than that of the information conveying signal. This paper shows that it is possible to have diversity-like gains over multipath fading channels with unresolved components even if the channel is not fully tracked. However the required SNR to achieve such diversity gains is highly dependent on the modulation formats. Properly designed receivers for unresolved multipath channels may reduce the SNR, where the diversity gains are achieved, and lower significantly the error floors. It is shown that a quadratic decorrelation receiver performs well over unresolved multipath channels.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128583870","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}
Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.476881
Y. Bar-Ness, N. Sezgin
Using a one-shot matched filter followed by a decorrelating detector, results in outputs corresponding to the main user and the left (earlier bit) and right (current bit) portion of the code of the other users. Due to reduced power, these outputs will result in a degradated probability of error. The purpose of this paper is to propose a method of combining for the data of the split code users. We suggest to use combining gain in proportion to the relative user delays. The resulting decorrelating detector always performs better than the split-output detector. Such diversity data combining eliminates the need for the multiple one-shot filters, one for each user.
{"title":"Maximum signal-to-noise ratio data combining for one-shot asynchronous multiuser CDMA detector","authors":"Y. Bar-Ness, N. Sezgin","doi":"10.1109/PIMRC.1995.476881","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.476881","url":null,"abstract":"Using a one-shot matched filter followed by a decorrelating detector, results in outputs corresponding to the main user and the left (earlier bit) and right (current bit) portion of the code of the other users. Due to reduced power, these outputs will result in a degradated probability of error. The purpose of this paper is to propose a method of combining for the data of the split code users. We suggest to use combining gain in proportion to the relative user delays. The resulting decorrelating detector always performs better than the split-output detector. Such diversity data combining eliminates the need for the multiple one-shot filters, one for each user.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127455405","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}
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