Pub Date : 2015-12-03DOI: 10.1109/PIMRC.2015.7343489
Thilina N. Weerasinghe, Alexandre Kanyeshuli, F. Li
One of the main challenges confronted by wireless sensor networks (WSNs) is to reduce energy consumption of nodes for the purpose of network lifetime extension. In the literature, many backbone based protocols such as connected dominating set (CDS) and broadcast or multicast based protocols are employed in order to improve network performance in terms of metrics like energy consumption, number of transmissions and dissemination delay. In this paper, we evaluate the performance of a recently proposed transmission protocol known as collective flooding (CF), which is based on link correlation, under various link correlation conditions. Through simulations and analyses we demonstrate that although CF performs well in most cases in comparison with CDS and multicast based protocols, weak link correlation could cause serious performance degradation for CF based data transmissions. Accordingly, we propose two techniques and demonstrate that they improve significantly the performance of CF under weak link correlation.
{"title":"Evaluation and improvement of collective flooding in WSNs with various link correlations","authors":"Thilina N. Weerasinghe, Alexandre Kanyeshuli, F. Li","doi":"10.1109/PIMRC.2015.7343489","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343489","url":null,"abstract":"One of the main challenges confronted by wireless sensor networks (WSNs) is to reduce energy consumption of nodes for the purpose of network lifetime extension. In the literature, many backbone based protocols such as connected dominating set (CDS) and broadcast or multicast based protocols are employed in order to improve network performance in terms of metrics like energy consumption, number of transmissions and dissemination delay. In this paper, we evaluate the performance of a recently proposed transmission protocol known as collective flooding (CF), which is based on link correlation, under various link correlation conditions. Through simulations and analyses we demonstrate that although CF performs well in most cases in comparison with CDS and multicast based protocols, weak link correlation could cause serious performance degradation for CF based data transmissions. Accordingly, we propose two techniques and demonstrate that they improve significantly the performance of CF under weak link correlation.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126757688","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343465
Jing Wang, Yan Zhang, Hui Hui, Ningbo Zhang
With the widespread application of wireless networks and the requirements of different user equipments (UEs), energy has become a scarcer resource as well as spectrum. In this paper, considering the actual scenarios of imperfect channel state information (CSI), we study a resource allocation scheme in the downlink orthogonal frequency division multiple access (OFDMA) systems. To balance between energy efficiency (EE) and proportional fairness (PF), the problem is formulated as maximizing average achievable EE with the constraints of PF of users and QoS assurance. To solve the optimal problem, we divide it into two layers. The sub-problem P1 of inner layer is solved to maximize PF, with the parameter of total transmit power which is updated by the sub-problem P2 of outer layer. In outer layer, with the allocation scheme from P1, a gradient-based adaptation resource allocation algorithm is proposed to achieve the maximum EE with total transmit power updated in every gradient iteration. Moreover, the impacts of the imperfect CSI on EE and PF are analysed. Simulation results are presented to show the superior performance of the proposed algorithms and verify the analytical findings.
{"title":"QoS-aware proportional fair energy-efficient resource allocation with imperfect CSI in downlink OFDMA systems","authors":"Jing Wang, Yan Zhang, Hui Hui, Ningbo Zhang","doi":"10.1109/PIMRC.2015.7343465","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343465","url":null,"abstract":"With the widespread application of wireless networks and the requirements of different user equipments (UEs), energy has become a scarcer resource as well as spectrum. In this paper, considering the actual scenarios of imperfect channel state information (CSI), we study a resource allocation scheme in the downlink orthogonal frequency division multiple access (OFDMA) systems. To balance between energy efficiency (EE) and proportional fairness (PF), the problem is formulated as maximizing average achievable EE with the constraints of PF of users and QoS assurance. To solve the optimal problem, we divide it into two layers. The sub-problem P1 of inner layer is solved to maximize PF, with the parameter of total transmit power which is updated by the sub-problem P2 of outer layer. In outer layer, with the allocation scheme from P1, a gradient-based adaptation resource allocation algorithm is proposed to achieve the maximum EE with total transmit power updated in every gradient iteration. Moreover, the impacts of the imperfect CSI on EE and PF are analysed. Simulation results are presented to show the superior performance of the proposed algorithms and verify the analytical findings.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124423375","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343382
M. Aloqlah, I. Atawi, M. Al-Mistarihi
This paper investigates the performance of an energy detector with single antenna reception operating over κ-μ shadowed fading. Novel accurate expressions for both the average detection probability and the average area under the receiver operating characteristic curve (average AUC) are derived using the well-known probability density function (PDF)-based method. The unified framework shows that the obtained results can be expressed as an infinite series form which converges steadily and rapidly. Based on this derived analytical formulas, the impact of key fading parameters on the performance of energy detector is discussed. Furthermore, the accuracy of the analytical expressions is substantiated by Monte Carlo simulation results.
{"title":"Further performance results for energy detector operating over k-μ shadowed fading","authors":"M. Aloqlah, I. Atawi, M. Al-Mistarihi","doi":"10.1109/PIMRC.2015.7343382","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343382","url":null,"abstract":"This paper investigates the performance of an energy detector with single antenna reception operating over κ-μ shadowed fading. Novel accurate expressions for both the average detection probability and the average area under the receiver operating characteristic curve (average AUC) are derived using the well-known probability density function (PDF)-based method. The unified framework shows that the obtained results can be expressed as an infinite series form which converges steadily and rapidly. Based on this derived analytical formulas, the impact of key fading parameters on the performance of energy detector is discussed. Furthermore, the accuracy of the analytical expressions is substantiated by Monte Carlo simulation results.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127774249","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343643
L. Khalil, P. Jung
Location services gained attraction with the recent advancements in context and location-aware technologies. Furthermore, location information becomes important with the deployment of wireless communication networks and the mobility that characterizes the wireless communication users. Within indoor environments, coverage of the explicit sensors based on Global Positioning System (GPS) is limited. Building an indoor location tracking system based on the Received Signal Strength Indicator (RSSI) of the widely deployed Wireless Local Area Network (WLAN) is considered cost effective. Extended Kalman Filter (EKF) is the most implemented algorithm for obtaining location information out of the RSSI measurements. In this paper, we propose the Spherical Simplex Unscented Kalman Filter (SSUKF) to work over WLAN IEEE 802.11n networks for indoor positioning and tracking. SSUKF exploits the RSSI measurements and the knowledge of anchor nodes' positions for location estimation. SSUKF is proposed for easy of implementation and reduced computational cost compared with EKF. Comparative results are illustrated using Monte Carlo simulations in MATLAB.
{"title":"Spherical simplex unscented Kalman filter for RSSI-Based WLAN IEEE 802.11n positioning and tracking","authors":"L. Khalil, P. Jung","doi":"10.1109/PIMRC.2015.7343643","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343643","url":null,"abstract":"Location services gained attraction with the recent advancements in context and location-aware technologies. Furthermore, location information becomes important with the deployment of wireless communication networks and the mobility that characterizes the wireless communication users. Within indoor environments, coverage of the explicit sensors based on Global Positioning System (GPS) is limited. Building an indoor location tracking system based on the Received Signal Strength Indicator (RSSI) of the widely deployed Wireless Local Area Network (WLAN) is considered cost effective. Extended Kalman Filter (EKF) is the most implemented algorithm for obtaining location information out of the RSSI measurements. In this paper, we propose the Spherical Simplex Unscented Kalman Filter (SSUKF) to work over WLAN IEEE 802.11n networks for indoor positioning and tracking. SSUKF exploits the RSSI measurements and the knowledge of anchor nodes' positions for location estimation. SSUKF is proposed for easy of implementation and reduced computational cost compared with EKF. Comparative results are illustrated using Monte Carlo simulations in MATLAB.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127974268","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343422
Yu Cao, Ming Jia, Jianglei Ma, Mohammad Javad Abdoli
An adjustable pulse bandwidth single carrier waveform for asynchronous low-cost low-power 5G M2M applications is proposed. The solution uses ultra narrow-band pulse to improve coverage, which is a much more efficient coverage enhancement solution than existing repetition solutions. Frequency localized pulse shaping is used, which allows asynchronous transmission and packing more machine-type devices (MTDs) for the same spectrum resources. In addition, bandwidth of each MTD is configurable based on long term channel quality and system load, which supports higher throughput and lower power consumption. Performance comparison with the repetition solution of 3GPP LTE demonstrates significant gain in terms of number of supported connections.
{"title":"Adjustable ultra narrow-band pulse for asynchronous 5G M2M communications","authors":"Yu Cao, Ming Jia, Jianglei Ma, Mohammad Javad Abdoli","doi":"10.1109/PIMRC.2015.7343422","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343422","url":null,"abstract":"An adjustable pulse bandwidth single carrier waveform for asynchronous low-cost low-power 5G M2M applications is proposed. The solution uses ultra narrow-band pulse to improve coverage, which is a much more efficient coverage enhancement solution than existing repetition solutions. Frequency localized pulse shaping is used, which allows asynchronous transmission and packing more machine-type devices (MTDs) for the same spectrum resources. In addition, bandwidth of each MTD is configurable based on long term channel quality and system load, which supports higher throughput and lower power consumption. Performance comparison with the repetition solution of 3GPP LTE demonstrates significant gain in terms of number of supported connections.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127350570","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343332
Myung-Don Kim, Jinyi Liang, Heon-Kook Kwon, Juyul Lee
Millimeter-wave propagation characteristics and channel models are being recently studied for applicability of the fifth generation (5G) mobile communication systems. To overcome the larger path loss on the higher frequency band above 6 GHz, highly directive antennas or beamforming techniques using large array antennas can be used to establish a reliable communication link between a transmitter and a receiver. In this paper, a recently conducted channel measurement campaign is introduced which makes use of a direction-scanning-sounding technique to study channel characteristics of 28 GHz millimeter-wave propagation in indoor environments. The measurement campaign has been conducted in passenger terminals at Seoul Railway Station and Incheon International Airport, which are representative indoor hotspot regions in Korea. Based on our experimental data, we investigate the relationship between the beamwidth of antenna and r.m.s. delay spread characteristics.
{"title":"Directional delay spread characteristics based on indoor channel measurements at 28GHz","authors":"Myung-Don Kim, Jinyi Liang, Heon-Kook Kwon, Juyul Lee","doi":"10.1109/PIMRC.2015.7343332","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343332","url":null,"abstract":"Millimeter-wave propagation characteristics and channel models are being recently studied for applicability of the fifth generation (5G) mobile communication systems. To overcome the larger path loss on the higher frequency band above 6 GHz, highly directive antennas or beamforming techniques using large array antennas can be used to establish a reliable communication link between a transmitter and a receiver. In this paper, a recently conducted channel measurement campaign is introduced which makes use of a direction-scanning-sounding technique to study channel characteristics of 28 GHz millimeter-wave propagation in indoor environments. The measurement campaign has been conducted in passenger terminals at Seoul Railway Station and Incheon International Airport, which are representative indoor hotspot regions in Korea. Based on our experimental data, we investigate the relationship between the beamwidth of antenna and r.m.s. delay spread characteristics.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133539402","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343324
Daiki Cho, S. Narieda
This paper presents a feature detection based spectrum sensing technique by some test statistics sharing among multiple receive antennas. In conventional feature (signal cyclostationarity) detection based spectrum sensing techniques with multiple antenna systems, computational complexity is not low, and it increases in proportion to the number of receive antennas. In this paper, test statistics are shared among multiple receive antennas for improving computational efficiency. The results are compared with results obtained using some conventional techniques and they show that 1) the presented technique can obtain favorable results even though the presented technique has a low computational complexity in comparison with the conventional techniques; 2) the performances and computational complexity of the presented technique are better and lower than that of conventional techniques in proportion to the number of receive antennas; 3) when noise variances at each of the RF chains are different, degradation of performance can be suppressed by adjusting computational complexity.
{"title":"Feature detection based computationally efficient spectrum sensing by test statistics sharing among multiple receive antennas","authors":"Daiki Cho, S. Narieda","doi":"10.1109/PIMRC.2015.7343324","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343324","url":null,"abstract":"This paper presents a feature detection based spectrum sensing technique by some test statistics sharing among multiple receive antennas. In conventional feature (signal cyclostationarity) detection based spectrum sensing techniques with multiple antenna systems, computational complexity is not low, and it increases in proportion to the number of receive antennas. In this paper, test statistics are shared among multiple receive antennas for improving computational efficiency. The results are compared with results obtained using some conventional techniques and they show that 1) the presented technique can obtain favorable results even though the presented technique has a low computational complexity in comparison with the conventional techniques; 2) the performances and computational complexity of the presented technique are better and lower than that of conventional techniques in proportion to the number of receive antennas; 3) when noise variances at each of the RF chains are different, degradation of performance can be suppressed by adjusting computational complexity.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130509746","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}
Device-to-Device communication (D2D) integrated in cellular networks emerges as a new trend in response to notable rise in traffic demand. Resource allocation is one of the important challenges in deployment of D2D networks. In this paper, we formulate an optimization problem for optimal resource allocation and then propose a novel algorithm namely maximum clique based resource allocation (MCRA) for improving the spectral reuse based on graph theoretic concept of maximum clique. Practical application of D2D communications requires each node to receive and transmit signals during the communication process. We have considered this issue in constructing the interference graph and mathematical formulations in our system model. We have proposed an efficient algorithm called binary code-based maximum clique detector (BCMD) to find the maximum clique solution with reduced complexity in interference graphs. Finally, to mitigate the overall interference and complexity of the problem, a two level resource allocation algorithm (TLRA) is suggested. The results demonstrate that substantial gains are achieved in terms of sum rate, time and computational complexity compared to the existing approaches in literature.
{"title":"Maximum clique-based resource allocation in device-to-device communications","authors":"Golnoosh Elhami, Mona Zehni, Mohammadreza Pakravan","doi":"10.1109/PIMRC.2015.7343480","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343480","url":null,"abstract":"Device-to-Device communication (D2D) integrated in cellular networks emerges as a new trend in response to notable rise in traffic demand. Resource allocation is one of the important challenges in deployment of D2D networks. In this paper, we formulate an optimization problem for optimal resource allocation and then propose a novel algorithm namely maximum clique based resource allocation (MCRA) for improving the spectral reuse based on graph theoretic concept of maximum clique. Practical application of D2D communications requires each node to receive and transmit signals during the communication process. We have considered this issue in constructing the interference graph and mathematical formulations in our system model. We have proposed an efficient algorithm called binary code-based maximum clique detector (BCMD) to find the maximum clique solution with reduced complexity in interference graphs. Finally, to mitigate the overall interference and complexity of the problem, a two level resource allocation algorithm (TLRA) is suggested. The results demonstrate that substantial gains are achieved in terms of sum rate, time and computational complexity compared to the existing approaches in literature.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130511680","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343613
Yibo He, T. Ratnarajah, E. G. Yousif, J. Xue, M. Sellathurai
This paper investigates the optimization of the generalized likelihood ratio test (GLRT) eigenvalue-based spectrum sensing detector in terms of decision thresholds and sensing time. In order to guarantee the interests of primary and secondary users simultaneously, the sensing performance is assessed using the total error rate, i.e., the summation of probabilities of false alarm and missed detection. Therefore, the generalized statistical distributions of the test statistic are derived under the absence and presence of primary users, assuming an arbitrary number of receive antennas. These distributions are necessary for the analyses of the total error rate performance and the optimization. The optimization consists of two parts. Firstly, the optimal decision threshold is numerically obtained, which can minimize the total error rate under the constraints of target probabilities of false alarm and missed detection. Secondly, the optimal sensing time is obtained when a target total error rate is guaranteed, so that the spectrum sensing process can be accelerated without the loss of sensing accuracy. Furthermore, the simulation and theoretical results reveal that the chosen optimal decision thresholds benefit the primary and secondary users simultaneously and the chosen optimal sensing time improves the speed of spectrum sensing.
{"title":"Optimization of multi-antenna GLRT-based spectrum sensing for cognitive radio","authors":"Yibo He, T. Ratnarajah, E. G. Yousif, J. Xue, M. Sellathurai","doi":"10.1109/PIMRC.2015.7343613","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343613","url":null,"abstract":"This paper investigates the optimization of the generalized likelihood ratio test (GLRT) eigenvalue-based spectrum sensing detector in terms of decision thresholds and sensing time. In order to guarantee the interests of primary and secondary users simultaneously, the sensing performance is assessed using the total error rate, i.e., the summation of probabilities of false alarm and missed detection. Therefore, the generalized statistical distributions of the test statistic are derived under the absence and presence of primary users, assuming an arbitrary number of receive antennas. These distributions are necessary for the analyses of the total error rate performance and the optimization. The optimization consists of two parts. Firstly, the optimal decision threshold is numerically obtained, which can minimize the total error rate under the constraints of target probabilities of false alarm and missed detection. Secondly, the optimal sensing time is obtained when a target total error rate is guaranteed, so that the spectrum sensing process can be accelerated without the loss of sensing accuracy. Furthermore, the simulation and theoretical results reveal that the chosen optimal decision thresholds benefit the primary and secondary users simultaneously and the chosen optimal sensing time improves the speed of spectrum sensing.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132529573","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 : 2015-12-03DOI: 10.1109/PIMRC.2015.7343276
P. Aggarwal, Anubha Gupta, V. Bohara
IEEE 802.11p standard is a wireless vehicular communication standard meant for outdoor applications. This standard suffers from the challenge of robust channel estimation due to rapid time-varying nature of the channel This paper proposes a novel scheme of channel estimation by utilizing the guard interval of every orthogonal frequency division multiplexing (OFDM) symbol. For a typical vehicular wireless communication where the channel fades quite rapidly, inter-symbol-interference (ISI) may not be as significant a problem as time varying nature of the channel due to Doppler effect. Hence, the proposed scheme utilizes the redundant space of guard interval (GI) (other than that required for cyclic prefix (CP) to combat ISI) to insert pseudo-random sequence (PRS)for channel estimation. A decision-directed time-domain least squares channel estimation method is proposed using the inserted PRS with CP. Simulation results show that the proposed scheme can considerably improve the bit error rate (BER) performance compared to the existing techniques.
{"title":"A guard interval assisted OFDM symbol-based channel estimation for rapid time-varying scenarios in IEEE 802.lip","authors":"P. Aggarwal, Anubha Gupta, V. Bohara","doi":"10.1109/PIMRC.2015.7343276","DOIUrl":"https://doi.org/10.1109/PIMRC.2015.7343276","url":null,"abstract":"IEEE 802.11p standard is a wireless vehicular communication standard meant for outdoor applications. This standard suffers from the challenge of robust channel estimation due to rapid time-varying nature of the channel This paper proposes a novel scheme of channel estimation by utilizing the guard interval of every orthogonal frequency division multiplexing (OFDM) symbol. For a typical vehicular wireless communication where the channel fades quite rapidly, inter-symbol-interference (ISI) may not be as significant a problem as time varying nature of the channel due to Doppler effect. Hence, the proposed scheme utilizes the redundant space of guard interval (GI) (other than that required for cyclic prefix (CP) to combat ISI) to insert pseudo-random sequence (PRS)for channel estimation. A decision-directed time-domain least squares channel estimation method is proposed using the inserted PRS with CP. Simulation results show that the proposed scheme can considerably improve the bit error rate (BER) performance compared to the existing techniques.","PeriodicalId":274734,"journal":{"name":"2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128457714","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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