Pub Date : 2012-04-01DOI: 10.1109/WCNCW.2012.6215502
Yanxiang Jiang, Jun Xiao, X. You
In this paper, asynchronous cooperative relay systems based on distributed linear convolutional space-time codes are investigated. By utilizing the banded Toeplitz property of the equivalent channel matrix, a block minimum mean square error (MMSE) equalization method employing the Trench algorithm to solve the Toeplitz linear equations is proposed, which avoids the high order matrix inversion operation in the traditional MMSE equalization method. The computation of the equalization operation is further simplified greatly by converting the high order banded Toeplitz linear equations to the low order ones. Simulation results show that satisfactory system performance can be achieved by employing non-minimum-order non-trace-orthogonal generator polynomials.
{"title":"A simplified equalization method for asynchronous cooperative relay systems","authors":"Yanxiang Jiang, Jun Xiao, X. You","doi":"10.1109/WCNCW.2012.6215502","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215502","url":null,"abstract":"In this paper, asynchronous cooperative relay systems based on distributed linear convolutional space-time codes are investigated. By utilizing the banded Toeplitz property of the equivalent channel matrix, a block minimum mean square error (MMSE) equalization method employing the Trench algorithm to solve the Toeplitz linear equations is proposed, which avoids the high order matrix inversion operation in the traditional MMSE equalization method. The computation of the equalization operation is further simplified greatly by converting the high order banded Toeplitz linear equations to the low order ones. Simulation results show that satisfactory system performance can be achieved by employing non-minimum-order non-trace-orthogonal generator polynomials.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123793421","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215511
G. Liebl, T. M. D. Moraes, Arturo Gonzalez Rodriguez, M. D. Nisar
In this work, we investigate the issue of interference coordination in relay-enhanced networks. We focus on Type 1 in-band relays as proposed for LTE-Advanced, where the base station and the relay nodes share the same frequency for the backhaul and relay access link. While using full-buffer traffic for the downstream, we propose a centralized interference coordination algorithm to mitigate interference between the relay nodes and their serving base station. Furthermore, we study an off-loading strategy which consists of combining our proposed algorithm with an extension of the relay's coverage region.
{"title":"Centralized interference coordination in relay-enhanced networks","authors":"G. Liebl, T. M. D. Moraes, Arturo Gonzalez Rodriguez, M. D. Nisar","doi":"10.1109/WCNCW.2012.6215511","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215511","url":null,"abstract":"In this work, we investigate the issue of interference coordination in relay-enhanced networks. We focus on Type 1 in-band relays as proposed for LTE-Advanced, where the base station and the relay nodes share the same frequency for the backhaul and relay access link. While using full-buffer traffic for the downstream, we propose a centralized interference coordination algorithm to mitigate interference between the relay nodes and their serving base station. Furthermore, we study an off-loading strategy which consists of combining our proposed algorithm with an extension of the relay's coverage region.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125880242","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215544
Ming-Ruan Huang, Wen Xu
In LTE-A or Rel. 10+, heterogeneous network deployments are supported to improve the user experienced link performance. However, such deployments give rise to new interference problems. In this study, macro-femto-cell interference scenarios for LTE-A downlink are investigated. We focus on the critical interference scenario of colliding cell-specific reference signals (CRSs). As conventional receivers with channel estimation based on the interfered CRSs fail to work properly, we present advanced interference mitigation schemes for user equipment (UE), such as the received-power dependent interference cancellation (IC), decision-directed channel estimation and IC-assisted channel estimation. Numerical simulation results showed that the proposed schemes are able to significantly reduce the inter-cell interference so that high throughput can be ensured even under the harsh macro-femto interferences.
{"title":"Macro-femto inter-cell interference mitigation for 3GPP LTE-A downlink","authors":"Ming-Ruan Huang, Wen Xu","doi":"10.1109/WCNCW.2012.6215544","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215544","url":null,"abstract":"In LTE-A or Rel. 10+, heterogeneous network deployments are supported to improve the user experienced link performance. However, such deployments give rise to new interference problems. In this study, macro-femto-cell interference scenarios for LTE-A downlink are investigated. We focus on the critical interference scenario of colliding cell-specific reference signals (CRSs). As conventional receivers with channel estimation based on the interfered CRSs fail to work properly, we present advanced interference mitigation schemes for user equipment (UE), such as the received-power dependent interference cancellation (IC), decision-directed channel estimation and IC-assisted channel estimation. Numerical simulation results showed that the proposed schemes are able to significantly reduce the inter-cell interference so that high throughput can be ensured even under the harsh macro-femto interferences.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129949586","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215541
Ville Syrjälä, V. Lehtinen, M. Valkama
This article addresses some implementation challenges in the potentially very energy-efficient charge-sampling radios. Alternative ways to implement charge sampler in charge sampling radio are considered, and the impacts and spectral shape characteristics of the sampling jitter induced signal distortion are analytically studied in these cases. The analysis shows that the spectrum of the distortion caused by the sampling jitter in a charge sampling receiver is not necessary flat, which in turn has direct impacts on the receiver design and dimensioning. The validity of the analytical results is verified with computer simulations. In simulations, both white Gaussian noise-type clock jitter and clock jitter generated by a phase-locked-loop oscillator are considered.
{"title":"Sampling jitter in charge sampling radio","authors":"Ville Syrjälä, V. Lehtinen, M. Valkama","doi":"10.1109/WCNCW.2012.6215541","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215541","url":null,"abstract":"This article addresses some implementation challenges in the potentially very energy-efficient charge-sampling radios. Alternative ways to implement charge sampler in charge sampling radio are considered, and the impacts and spectral shape characteristics of the sampling jitter induced signal distortion are analytically studied in these cases. The analysis shows that the spectrum of the distortion caused by the sampling jitter in a charge sampling receiver is not necessary flat, which in turn has direct impacts on the receiver design and dimensioning. The validity of the analytical results is verified with computer simulations. In simulations, both white Gaussian noise-type clock jitter and clock jitter generated by a phase-locked-loop oscillator are considered.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129952977","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215486
M. Beale
This paper describes issues related to one of the most significant challenges that 3GPP faces in supporting M2M communications over LTE: facilitating the support for low cost M2M devices. The paper considers the requirements for low cost M2M devices and the most significant contributors to device cost. System bandwidth is identified as being a significant cost contributor and backwards compatible approaches to reducing system bandwidth are identified.
{"title":"Future challenges in efficiently supporting M2M in the LTE standards","authors":"M. Beale","doi":"10.1109/WCNCW.2012.6215486","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215486","url":null,"abstract":"This paper describes issues related to one of the most significant challenges that 3GPP faces in supporting M2M communications over LTE: facilitating the support for low cost M2M devices. The paper considers the requirements for low cost M2M devices and the most significant contributors to device cost. System bandwidth is identified as being a significant cost contributor and backwards compatible approaches to reducing system bandwidth are identified.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130040909","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215530
M. I. Akram, A. Sheikh
This paper presents statistical properties of the mobile to mobile Nakagami Hoyt channel model with diffused Line of Sight (LOS) under isotropic condition. The envelop and phase probability density functions (pdf), spatial-time autocorrelation function(STACF), power spectral density, level crossing rate (LCR), the average fade duration (AFD) and mean square error (MSE) of time autocorrelation function of the Nakagami Hoyt channel have been derived under the assumption that both the transmitter and receiver are non-stationary having omnidirectional antennas and a diffused line of sight (LOS) component is present. The Inverse Fast Fourier Transform (IFFT) based simulator has been developed to validate this model. The simulator and analytical results corroborate.
{"title":"Modeling Nakagami Hoyt mobile to mobile fading channel with diffused Line of Sight","authors":"M. I. Akram, A. Sheikh","doi":"10.1109/WCNCW.2012.6215530","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215530","url":null,"abstract":"This paper presents statistical properties of the mobile to mobile Nakagami Hoyt channel model with diffused Line of Sight (LOS) under isotropic condition. The envelop and phase probability density functions (pdf), spatial-time autocorrelation function(STACF), power spectral density, level crossing rate (LCR), the average fade duration (AFD) and mean square error (MSE) of time autocorrelation function of the Nakagami Hoyt channel have been derived under the assumption that both the transmitter and receiver are non-stationary having omnidirectional antennas and a diffused line of sight (LOS) component is present. The Inverse Fast Fourier Transform (IFFT) based simulator has been developed to validate this model. The simulator and analytical results corroborate.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116987261","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215519
Armir Bujari, C. Palazzi, D. Maggiorini, C. Quadri, G. P. Rossi
The growing number of mobile devices equipped with a wireless interface and the end-user trend to shift toward wireless technology is opening new possibilities for networking. In particular, opportunistic communication embodies a feasible solution for environments with scarce or costly infrastructure-based connectivity. In this context we provide a delay-tolerant solution that provides service opportunistic connectivity. Our approach follows the Delay/Disruption Tolerant Network (DTN) paradigm by implementing a store-carry-and-forward communication model among mobile users and buses, the latter embodying carrier entities. A user can delegate the carrier a request which involves Internet access. This request is then forwarded to the bus station's Internet Gateway (IG) in an opportunistic fashion, including both data muling and multi-hop transmission through other buses. Once the request is served at the bus station's IG, the result is opportunistically sent back toward the bus line where the user expects the result. In this paper we present our idea and discuss results obtained through simulations in a realistic urban scenario.
{"title":"A solution for mobile DTN in a real urban scenario","authors":"Armir Bujari, C. Palazzi, D. Maggiorini, C. Quadri, G. P. Rossi","doi":"10.1109/WCNCW.2012.6215519","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215519","url":null,"abstract":"The growing number of mobile devices equipped with a wireless interface and the end-user trend to shift toward wireless technology is opening new possibilities for networking. In particular, opportunistic communication embodies a feasible solution for environments with scarce or costly infrastructure-based connectivity. In this context we provide a delay-tolerant solution that provides service opportunistic connectivity. Our approach follows the Delay/Disruption Tolerant Network (DTN) paradigm by implementing a store-carry-and-forward communication model among mobile users and buses, the latter embodying carrier entities. A user can delegate the carrier a request which involves Internet access. This request is then forwarded to the bus station's Internet Gateway (IG) in an opportunistic fashion, including both data muling and multi-hop transmission through other buses. Once the request is served at the bus station's IG, the result is opportunistically sent back toward the bus line where the user expects the result. In this paper we present our idea and discuss results obtained through simulations in a realistic urban scenario.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117117412","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215496
M. Siekkinen, M. Hiienkari, J. Nurminen, Johanna Nieminen
Ultra low power communication mechanisms are essential for future Internet of Things deployments. Bluetooth Low Energy (BLE) is one promising candidate for such deployments. We study the energy consumption of BLE by measuring real devices with a power monitor and derive models of the basic energy consumption behavior observed from the measurement results. We investigate also the overhead of Ipv6-based communication over BLE, which is relevant for future IoT scenarios. We contrast our results by performing similar measurements with ZigBee/802.15.4 devices. Our results show that when compared to ZigBee, BLE is indeed very energy efficient in terms of number of bytes transferred per Joule spent. In addition, IPv6 communication energy overhead remains reasonable. We also point out a few specific limitations with current stack implementations and explain that removing those limitations could improve energy utility significantly.
{"title":"How low energy is bluetooth low energy? Comparative measurements with ZigBee/802.15.4","authors":"M. Siekkinen, M. Hiienkari, J. Nurminen, Johanna Nieminen","doi":"10.1109/WCNCW.2012.6215496","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215496","url":null,"abstract":"Ultra low power communication mechanisms are essential for future Internet of Things deployments. Bluetooth Low Energy (BLE) is one promising candidate for such deployments. We study the energy consumption of BLE by measuring real devices with a power monitor and derive models of the basic energy consumption behavior observed from the measurement results. We investigate also the overhead of Ipv6-based communication over BLE, which is relevant for future IoT scenarios. We contrast our results by performing similar measurements with ZigBee/802.15.4 devices. Our results show that when compared to ZigBee, BLE is indeed very energy efficient in terms of number of bytes transferred per Joule spent. In addition, IPv6 communication energy overhead remains reasonable. We also point out a few specific limitations with current stack implementations and explain that removing those limitations could improve energy utility significantly.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126823659","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215529
Han Deng, Jia Li, Liuqing Yang, T. Talty
In wireless communication, MIMO technology can improve performance by offering larger channel capacity without additional bandwidth or transmitting power. This paper presents the measurement of intra-vehicle ultra wideband (UWB) multiple-input multiple-output (MIMO) channels and evaluates channel capacity. The measurement was carried out in time domain for three scenarios: (1) in the car compartment, (2) beneath the chassis, and (3) inside the engine compartment. The results show that MIMO channel capacities increase while using more antennas and the capacity achieved by water filling is larger than that achieved by equal power distribution.
{"title":"Intra-vehicle UWB MIMO channel capacity","authors":"Han Deng, Jia Li, Liuqing Yang, T. Talty","doi":"10.1109/WCNCW.2012.6215529","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215529","url":null,"abstract":"In wireless communication, MIMO technology can improve performance by offering larger channel capacity without additional bandwidth or transmitting power. This paper presents the measurement of intra-vehicle ultra wideband (UWB) multiple-input multiple-output (MIMO) channels and evaluates channel capacity. The measurement was carried out in time domain for three scenarios: (1) in the car compartment, (2) beneath the chassis, and (3) inside the engine compartment. The results show that MIMO channel capacities increase while using more antennas and the capacity achieved by water filling is larger than that achieved by equal power distribution.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":" 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113947405","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 : 2012-04-01DOI: 10.1109/WCNCW.2012.6215492
Rina Wu, Yuan Cao, C. Liu, Pan Hui, Li Li, Erwu Liu
Unlike traditional opportunistic networks characterized by relatively very short connectivity period among mobile devices during their contacts, in this paper, we explicitly consider the underground/bus scenario where the inherited structured mobility pattern enforces more stable passenger behaviors. If with the aid of potential formation of Bluetooth-enabled multi-hop wireless networks, one can expect a type of new emerging applications for passengers on the move. In particular, we conducted a thorough experimental study on passenger dynamics and connectivities in Beijing Underground during peak hours, via building an information collection application in an Android-based smartphone. From the total of 41,806 records for 120 days, we have performed extensive analysis on a variety of statistics for the number of neighbors, the lifetime of the neighbors, the received signal strength indicator (RSSI) and its derived physical distance, flow speed of the nearby passengers, battery usage rate, etc. Then, we further prove our justification that Bluetooth is the perfect technology to build up a relatively small multi-hop wireless network with the network size of four nodes, and in particular it is applicable and may fundamentally drive new applications in an underground environment during the peak hour, where two notable examples are music album sharing and neighborhood gaming.
{"title":"Exploring passenger dynamics and connectivities in Beijing underground via bluetooth networks","authors":"Rina Wu, Yuan Cao, C. Liu, Pan Hui, Li Li, Erwu Liu","doi":"10.1109/WCNCW.2012.6215492","DOIUrl":"https://doi.org/10.1109/WCNCW.2012.6215492","url":null,"abstract":"Unlike traditional opportunistic networks characterized by relatively very short connectivity period among mobile devices during their contacts, in this paper, we explicitly consider the underground/bus scenario where the inherited structured mobility pattern enforces more stable passenger behaviors. If with the aid of potential formation of Bluetooth-enabled multi-hop wireless networks, one can expect a type of new emerging applications for passengers on the move. In particular, we conducted a thorough experimental study on passenger dynamics and connectivities in Beijing Underground during peak hours, via building an information collection application in an Android-based smartphone. From the total of 41,806 records for 120 days, we have performed extensive analysis on a variety of statistics for the number of neighbors, the lifetime of the neighbors, the received signal strength indicator (RSSI) and its derived physical distance, flow speed of the nearby passengers, battery usage rate, etc. Then, we further prove our justification that Bluetooth is the perfect technology to build up a relatively small multi-hop wireless network with the network size of four nodes, and in particular it is applicable and may fundamentally drive new applications in an underground environment during the peak hour, where two notable examples are music album sharing and neighborhood gaming.","PeriodicalId":392329,"journal":{"name":"2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114237781","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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