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IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)最新文献

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Turbo decoder assisted frame error rate estimation Turbo解码器辅助的帧误码率估计
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957198
Jung-Fu Cheng
{"title":"Turbo decoder assisted frame error rate estimation","authors":"Jung-Fu Cheng","doi":"10.1109/VTC.2001.957198","DOIUrl":"https://doi.org/10.1109/VTC.2001.957198","url":null,"abstract":"In modern digital communication systems, quality of service is specified in terms of average frame error rates (FER). Accurate and fast estimation of the FER is thus a crucial element of these power control or adaptive systems. This paper proposes an accurate and fast FER estimation method for any receivers equipped with iterative processors and the ability to stop the iterative processing early. Based on the observation that the average number of processing iterations is strongly correlated to the operating FER, the proposed method estimates the FER through the average number of actual processing iterations. As confirmed by extensive simulation results, the proposed estimation algorithm is much more accurate and responsive to changing operating conditions than traditional methods.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125171201","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
Reduced-rank equalization for EDGE via conjugate gradient implementation of multi-stage nested Wiener filter 利用共轭梯度实现多阶段嵌套维纳滤波器的EDGE降阶均衡
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956534
G. Dietl, M. Zoltowski, M. Joham
{"title":"Reduced-rank equalization for EDGE via conjugate gradient implementation of multi-stage nested Wiener filter","authors":"G. Dietl, M. Zoltowski, M. Joham","doi":"10.1109/VTC.2001.956534","DOIUrl":"https://doi.org/10.1109/VTC.2001.956534","url":null,"abstract":"The Wiener filter solves the Wiener-Hopf equation and may be approximated by the multi-stage nested Wiener filter (MSNWF) which lies in the Krylov subspace of the covariance matrix of the observation and the cross-correlation vector between the observation and the desired signal. Moreover, since the covariance matrix is Hermitian, the Lanczos algorithm can be used to compute the Krylov subspace basis. The conjugate gradient (CG) method is another approach to solving a system of linear equations. We derive the relationship between the CG method and the Lanczos based MSNWF and finally transform the formulas of the MSNWF into those of the CG algorithm. Consequently, we present a CG based MSNWF where the filter weights and the mean square error (MSE) are updated at each iteration step. The resulting algorithm is used for linear equalization of the received signal in an enhanced data rates for GSM evolution (EDGE) system. Simulation results demonstrate the ability of the MSNWF to reduce receiver complexity while maintaining the same level of system performance.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128040693","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
Radio channel description and quality of service for TETRA direct mode operation in forest environments 森林环境中TETRA直接模式操作的无线电信道描述和服务质量
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957088
I. Kovács, P. Eggers, K. Olesen, Leif G. Petersen
{"title":"Radio channel description and quality of service for TETRA direct mode operation in forest environments","authors":"I. Kovács, P. Eggers, K. Olesen, Leif G. Petersen","doi":"10.1109/VTC.2001.957088","DOIUrl":"https://doi.org/10.1109/VTC.2001.957088","url":null,"abstract":"This paper describes radio channel and BER investigations performed in various scenarios typical to the TETRA direct mode operation (DMO), in a forest area. The data from radio channel sounding measurements was analysed in terms of average fade duration and envelop CDF. The same data was used to evaluate the unprotected BER on a TETRA communication link. The BER level distribution was compared to the distribution obtained when simulating a pedestrian speed TETRA DMO radio channel. The dynamics of the mobiles can have a strong influence on the radio link quality. As a general tendency, higher practical BER values can be expected as compared to the simulations when using the simple TETRA radio channel model.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128035109","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
Resource sharing for data services (RSDS) 数据服务的资源共享(RSDS)
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956923
F. A. Cruz-Pérez, L. Ortigoza-Guerrero
{"title":"Resource sharing for data services (RSDS)","authors":"F. A. Cruz-Pérez, L. Ortigoza-Guerrero","doi":"10.1109/VTC.2001.956923","DOIUrl":"https://doi.org/10.1109/VTC.2001.956923","url":null,"abstract":"We present a new flexible resource allocation (FRA) strategy, called resource sharing for data services (RSDS), that dynamically averages the allocated resources to the call requests based on the number of calls in a cell. RSDS accommodates the maximum number of requests while providing acceptable quality to the admitted request through the use of. degradation and compensation techniques. An analytical model (validated by computer simulations) is developed to model RSDS in a scenario with multiple types of service, each of them with different priorities. Preliminary results indicate that the RSDS strategy outperforms some strategies already reported in the literature.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122387905","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
Asymmetric energy allocation strategies to improve turbo codes performance 提高turbo码性能的非对称能量分配策略
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956518
F. Cabarcas, J. Garcia-Frías
{"title":"Asymmetric energy allocation strategies to improve turbo codes performance","authors":"F. Cabarcas, J. Garcia-Frías","doi":"10.1109/VTC.2001.956518","DOIUrl":"https://doi.org/10.1109/VTC.2001.956518","url":null,"abstract":"We study the effect of asymmetric energy allocations to the output bits of turbo codes. We show that the error floor improves as more energy is given to the non-systematic bits. The standard (symmetric) energy allocation scheme achieves the best results in the waterfall region. However, the degradation observed in the waterfall region is practically non-existent when asymmetric energy allocation schemes close to the standard one are utilized. This implies that by using an appropriate energy allocation strategy, significant improvement in the error floor can be achieved with no practical degradation in the waterfall region.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122612240","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: 5
Fundamental limits on symbol rate in frequency selective continuous fading channels 频率选择性连续衰落信道中符号速率的基本限制
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956967
Qinfang Sun, D. Cox
{"title":"Fundamental limits on symbol rate in frequency selective continuous fading channels","authors":"Qinfang Sun, D. Cox","doi":"10.1109/VTC.2001.956967","DOIUrl":"https://doi.org/10.1109/VTC.2001.956967","url":null,"abstract":"We consider fundamental limits on the symbol rate in frequency selective continuous fading channels. We show the relationship between the upper and lower bounds on the symbol rate set by the delay spread and the Doppler frequency of the channel respectively. We assume training-based channel estimation without tracking, and coherent detection without equalization. An approximation is derived for simulating channels with small delay spread using symbol period spaced samples. Simulation results with a two-path channel model are presented, including bit error rate (BER) and maximum throughput as functions of normalized delay spread for fixed products of delay spread and Doppler frequency. We also discuss the general implications of these results.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122691177","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
A comparison of differential detection techniques for parallel interference cancellation 并行干扰消除的差分检测技术比较
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.956446
B. Woerner, N. Hayashi
{"title":"A comparison of differential detection techniques for parallel interference cancellation","authors":"B. Woerner, N. Hayashi","doi":"10.1109/VTC.2001.956446","DOIUrl":"https://doi.org/10.1109/VTC.2001.956446","url":null,"abstract":"This paper examines the performance achieved in AWGN channels and flat Rayleigh fading channels by combining non-coherent multistage parallel interference cancellation with multiple symbol differential detection algorithms for DS/SS CDMA systems using DBPSK and DQPSK modulation. We compare the performance of this multiuser receiver conjugated with traditional differential detection, multiple symbol detection, Viterbi differential decoding, and multiple phase shift differential detection.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122825813","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
Evolution of EDGE to higher data rates using QAM 使用QAM将EDGE进化为更高的数据速率
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957149
Hiiseyin Arslan, Jung-Fu Cheng, K. Balachandran
{"title":"Evolution of EDGE to higher data rates using QAM","authors":"Hiiseyin Arslan, Jung-Fu Cheng, K. Balachandran","doi":"10.1109/VTC.2001.957149","DOIUrl":"https://doi.org/10.1109/VTC.2001.957149","url":null,"abstract":"EDGE has enabled GSM networks to offer third generation services as part of the UMTS core network. This has been possible through two steps: the introduction of 8PSK modulation and the specification of interfaces from the GERAN (GSM/EDGE radio access network) to the UMTS core network. This paper studies further improvements to spectral efficiency and capacity for EDGE through the use of more sophisticated adaptive modulation schemes, and the use of newer coding schemes (see Nanda, S. et al., IEEE Commun. Mag., p.54-64, 2000; Ikeda, T. et al., IEEE Trans. Vehic. Tech., vol.49, p.404-12, 2000). It is possible to use theoretical predictions of outage analysis to predict the gain in performance due to the use of higher order modulations.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131126961","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
A subspace blind channel estimation method for OFDM systems without cyclic prefix 一种无循环前缀OFDM系统的子空间盲信道估计方法
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957124
Sumit Roy, Chengyang Li
{"title":"A subspace blind channel estimation method for OFDM systems without cyclic prefix","authors":"Sumit Roy, Chengyang Li","doi":"10.1109/VTC.2001.957124","DOIUrl":"https://doi.org/10.1109/VTC.2001.957124","url":null,"abstract":"We propose a subspace based blind channel estimation method for OFDM systems over a time-dispersive channel. Our approach is motivated by the resemblance of the multichannel signal model resulting from oversampling (or use of multiple receive sensors) of the received OFDM signal to that in a conventional single carrier system (Moulines et al. 1995). The proposed algorithm distinguishes itself from many previously reported channel estimation methods by the elimination of the cyclic prefix (CP), thereby leading to higher channel utilization. Comparison of the proposed method with other two reported subspace channel estimation methods (Heath and Giannakis 1999; Xiaodong Cai and Akansu 2000) is presented by computer simulations to support its effectiveness.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131146636","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: 122
An MGF-derivative based unified analysis of incoherent diversity reception of M-ary orthogonal signals over fading channels 基于mgf导数的衰落信道正交信号非相干分集接收的统一分析
IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211) Pub Date : 2001-10-07 DOI: 10.1109/VTC.2001.957180
A. Annamalai, C. Tellambura
{"title":"An MGF-derivative based unified analysis of incoherent diversity reception of M-ary orthogonal signals over fading channels","authors":"A. Annamalai, C. Tellambura","doi":"10.1109/VTC.2001.957180","DOIUrl":"https://doi.org/10.1109/VTC.2001.957180","url":null,"abstract":"Exact error probability expressions for noncoherent M-ary frequency-shift-keying (MFSK) systems that employ postdetection equal-gain diversity over Rayleigh, Rician and Nakagami-m channels are derived using a Laplace derivative formula. Both independent and generically correlated fading cases are considered. For independent fading, closed-form solutions are also derived for both Nakagami-q fading (either with identical or dissimilar fading statistics) and mixed fading cases. Previous results are shown to be specific instances of our general expressions. Additionally, a new concise, derivative formula is obtained for calculating the bit error rate of square-law detected multichannel binary differential phase-shift-keying (BDPSK) signals. All these expressions are applicable in many cases of practical interest and provide accurate predictions of the performance of both binary and M-ary orthogonal signalling over generalized fading channels (with arbitrary fading parameters). Several numerical examples are presented to illustrate the application of the theory, including the investigation into optimal diversity order in energy-sharing communications, characterization of block orthogonal codes with soft-decision decoding (i.e., MFSK may also be viewed as a form of repetition coding) and analysis of MFSK with space (antenna) diversity.","PeriodicalId":129008,"journal":{"name":"IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131566877","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
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