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Optimal sample delay for OFDM error floor over small-delay dispersion channel 小延迟色散信道上OFDM误差层的最优采样延迟
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117290
Adriana Lipovac, V. Lipovac, B. Modlic
{"title":"Optimal sample delay for OFDM error floor over small-delay dispersion channel","authors":"Adriana Lipovac, V. Lipovac, B. Modlic","doi":"10.1109/WTS.2015.7117290","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117290","url":null,"abstract":"In this paper, the earlier developed error floor model for the peak performance estimation of OFDM transmission over multipath channel with small delay dispersion is enhanced by deriving a novel expression for estimating the optimal sampling delay in the power delay profile. The validity of the estimation is checked in the LTE FDD downlink environment by means of the industry-standard simulator that provided values close to the analytically predicted ones. Optimal sample time estimation can be used as a means to explore the ultimate error floor values, but the model can also be of practical use in adaptive sampling schemes.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117012211","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
Accurate performance evaluation of semi-blind dual-hop wireless relay systems under generalized fading 广义衰落下半盲双跳无线中继系统的精确性能评估
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117284
M. Aloqlah, I. Atawi
{"title":"Accurate performance evaluation of semi-blind dual-hop wireless relay systems under generalized fading","authors":"M. Aloqlah, I. Atawi","doi":"10.1109/WTS.2015.7117284","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117284","url":null,"abstract":"In current cooperative communication systems, a relay terminal is very often used as an intermediate node. Introducing this node may degrade or improve the overall system performance, depending on the power imbalance between the hops. In this paper a unified framework to estimate the performance of dual-hop fixed-gain relay system when each hop is subjected to κ-μ shadowed fading is presented. Specifically, new closed form expressions are derived for the outage probability, the generalized moments, the moment generating function (MGF), and the ergodic capacity. This unified analytical framework is obtained in terms of well-known and easily computable functions. The accuracy of the analytical results is verified through computer simulations.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116042107","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
Optimal wake-up scheduling for energy efficient fixed-rate wireless transmissions with real-time constraints 具有实时约束的高能效固定速率无线传输的最优唤醒调度
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117267
Lei Miao, Lijian Xu
{"title":"Optimal wake-up scheduling for energy efficient fixed-rate wireless transmissions with real-time constraints","authors":"Lei Miao, Lijian Xu","doi":"10.1109/WTS.2015.7117267","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117267","url":null,"abstract":"This paper studies the wake-up scheduling problem for fixed-rate wireless transmissions with real-time constraints. Our goal is to minimize the overall energy costs, including the operating cost and wake-up cost, while still guaranteeing the deadline of each individual task. In particular, we consider the homogeneous case in which it takes the same amount of time to serve each task and each task needs to be served by d seconds upon arrival. In this paper, we focus on both off-line and online control problems and determine the right time (a control variable) to wake up the system. For off-line control, we use sample path analysis to discover that the best time to wake up the system can be calculated based on task arrival information. For online control, we propose an iterative algorithm that dynamically adjusts the system wake-up time based on newly available and backlogged task information. We show that the online control and the off-line control return the same optimal wake-up time.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125789064","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: 4
QR codes and authentication protection 二维码和认证保护
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117256
J. Yang, Yue Zhang
{"title":"QR codes and authentication protection","authors":"J. Yang, Yue Zhang","doi":"10.1109/WTS.2015.7117256","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117256","url":null,"abstract":"The development of the Internet and telecommunication urges researchers to look for a better way to secure online users' private information. This study is rooted in online user account protection, measuring the effect of QR codes on fear appeals and authentication protection. This study contributes to the extant literature by integrating two theories - protection motivation theory and the theory of planned behavior. The main goal of this study is to investigate how the co-use of computers and mobile devices protect online users' online credentials. The results of the study also provide guidelines to IT developers for future directions in authentication protection.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125631516","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
Decoding of short LT codes over BIAWGN channels with Gauss-Jordan elimination-assisted belief propagation method 高斯-约当消去辅助信念传播方法在BIAWGN信道上解码短LT码
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117268
Amrit Kharel, Lei Cao
{"title":"Decoding of short LT codes over BIAWGN channels with Gauss-Jordan elimination-assisted belief propagation method","authors":"Amrit Kharel, Lei Cao","doi":"10.1109/WTS.2015.7117268","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117268","url":null,"abstract":"Belief propagation (BP) algorithm has been widely used for decoding LT codes. It is well known that the premature termination of the BP decoding due to the lack of degree one symbols in the ripple impairs the decoding performance of the code. This problem has been well studied and tackled for binary erasure channel (BEC). However, for binary input additive white Gaussian noise (BIAWGN) channels, the issue still remains unaddressed. In this paper, we propose Gauss-Jordan elimination (GJE)-assisted BP algorithm to address this problem and study its decoding performance for short LT codes over BIAWGN channels. The use of GJE can effectively help the BP decoder continue the decoding process whenever it gets stuck due to the premature termination. Simulation results show that, under the same channel conditions and transmission overheads, the bit error rate (BER) performance obtained using the GJE-assisted BP method significantly outperforms the one obtained using the traditional BP algorithm.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133124060","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: 7
WLAN covert timing channel detection WLAN隐蔽定时通道检测
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117246
Hong Zhao, Min-Xiu Chen
{"title":"WLAN covert timing channel detection","authors":"Hong Zhao, Min-Xiu Chen","doi":"10.1109/WTS.2015.7117246","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117246","url":null,"abstract":"Wireless LANs have been widely used to carry out a system to access Internet. WLAN security becomes mission one, especially a new type of attacks called covert channel based attack surfaced over the past few years. This attack uses different data rates provided in WLAN to transmit a secret message. Detecting this covert channel could be difficult due to existence of rate diversity in 802.11 WLAN. Multiple transmission data rates are supported to exploit the trade-off between obtaining the highest possible data rate and trying to minimize the number of communication errors. In this paper, a feature modal is proposed to form possible hypotheses and then statistic hypothesis testing is applied. Simulation results on publicly available WLAN traffic show that our proposed approach could achieve 100% detection rate.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"223 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121352506","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
Link adaptive relaying with noncoherent BFSK and DPSK modulations in multiple access relay channels 在多接入中继信道中采用非相干BFSK和DPSK调制的链路自适应中继
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117265
Muhammet Ali Karabulut, Ö. Özdemir, H. Ilhan
{"title":"Link adaptive relaying with noncoherent BFSK and DPSK modulations in multiple access relay channels","authors":"Muhammet Ali Karabulut, Ö. Özdemir, H. Ilhan","doi":"10.1109/WTS.2015.7117265","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117265","url":null,"abstract":"Network coding has recently received significant attention as an innovative approach to improve the throughput of wireless communication systems. The multiple access relay channel (MARC), in which multiple users communicate with a common destination via a relay, is one of the important network coding applications for wireless cooperative communications. In this paper, link adaptive relaying (LAR) approach which combats performance degradation due to error propagation in digital relaying based wireless networks has been applied to the MARC model with noncoherent binary frequency shift keying (BFSK) and differential binary phase shift keying (DPSK) signalings which are among the prominent techniques for eliminating the need for channel estimation by training sequences. Simulation results for Nakagami-m fading channels have shown that the proposed MARC model with LAR scheme outperforms the noncooperative system that involves direct transmissions and overcome the diversity gain reduction due to error propagation.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123768277","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
Revisit on maximum ratio combining reception practically attained across correlated Nakagami-m branches 重新讨论在相关的Nakagami-m分支中实际获得的最大接收比
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117282
Jia-Chin Lin
{"title":"Revisit on maximum ratio combining reception practically attained across correlated Nakagami-m branches","authors":"Jia-Chin Lin","doi":"10.1109/WTS.2015.7117282","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117282","url":null,"abstract":"First- and second-order statistics that can be attained at a practical receiver via maximum-ratio combining (MRC) reception across correlated Nakagami-m branches are studied in this paper. A lump sum of the branch weight squares is employed in the conventional analysis of the MRC reception. The conventional MRC reception whose first- and second-order statistics were only derived on a noise-free condition can never be achieved in practice because the branches, which are smeared by crosscorrelation and are corrupted by noise, can only be statistically specified and they must be considered of as stochastic processes at the receiver, instead of deterministic time functions. The proposed method, in fact, considers the branch weights as stochastic processes and effectively restores diversity by the assistance from a linear transformation. Significant component selection combining (SCSC) can hence be applied not only to simplify the inner receiver but also to reduce the estimation error and the thermal noise. The MRC reception is then conducted with assistance from estimates of the decorrelated branches that are selected by the SCSC methods. The performance merit figures, i.e., first- and second-order statistics, must be redefined in the post-inner-receiving sense to provide sufficient and accurate information required for the design or the derivations of the outer receiving techniques or algorithms. The first- and second-order statistics of the MRC reception over the significant decorrelated diversity branches were verified by computer simulations.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126128469","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
Cell sectorization-based pilot assignment scheme in massive MIMO systems 大规模MIMO系统中基于小区扇区的导频分配方案
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117245
Zheng Zhao, Zhigang Chen, Yitao Liu
{"title":"Cell sectorization-based pilot assignment scheme in massive MIMO systems","authors":"Zheng Zhao, Zhigang Chen, Yitao Liu","doi":"10.1109/WTS.2015.7117245","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117245","url":null,"abstract":"Pilot contamination has become a major capacity bottleneck in massive MIMO systems. To mitigate pilot contamination, a novel cell sectorization-based pilot assignment (CS-PA) scheme is proposed in this paper. By separating the users that transmit the same pilot in physical space, the pilot transmitted by the user in each sector is orthogonal with pilots transmitted by the users in adjacent sectors. Due to the advantages of cell sectorization and pilot assignment, the proposed CS-PA scheme can effectively suppress pilot contamination. In addition, the proposed CS-PA scheme achieves higher system throughput as the number of base station antennas tends to infinity. The closed-form expression for the achieved rates is derived to verify the advantages of the proposed scheme. Numerical results show that the proposed CS-PA scheme significantly outperforms the typical pilot contamination mitigation methods.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133890321","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
Improved reliability information for OFDM systems on time-varying frequency-selective fading channels 改进了时变频率选择性衰落信道OFDM系统的可靠性信息
2015 Wireless Telecommunications Symposium (WTS) Pub Date : 2015-04-15 DOI: 10.1109/WTS.2015.7117241
O. Ogundile, D. Versfeld
{"title":"Improved reliability information for OFDM systems on time-varying frequency-selective fading channels","authors":"O. Ogundile, D. Versfeld","doi":"10.1109/WTS.2015.7117241","DOIUrl":"https://doi.org/10.1109/WTS.2015.7117241","url":null,"abstract":"Recently, soft reliability information derived from the Channel State Information (CSI) using Distance Metric (DM) method was shown to improve the performance of rectangular M-ary Quadrature Amplitude Modulation (M-QAM) systems over flat Rayleigh fading channels. In this paper, we extend this method to Orthogonal Frequency Division Multiplexing (OFDM) systems on time-varying frequency-selective Rayleigh fading channels. In particular, we derive the soft reliability information from the frequency domain CSI. The performance of the OFDM system is verified using the Koetter and Vardy, Reed-Solomon (KV-RS) algebraic soft decision decoding algorithm. We compare the Codeword Error Rate (CER) performance of the OFDM system with 16-QAM as the modulation schemes. In addition, the OFDM system performance is documented for different values of normalized Doppler frequency, and frame length size. From the computer simulation results, the proposed method offers superior CER performance in comparison with the conventionally used DM method in the literature with no significant increase in computational time complexity.","PeriodicalId":300798,"journal":{"name":"2015 Wireless Telecommunications Symposium (WTS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133197825","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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