Pub Date : 2010-11-01DOI: 10.1109/ISABEL.2010.5702844
A. Paier, Daniele Faetani, C. Mecklenbrauker
We evaluate the physical layer of infrastructure-to-vehicle communications from real-world measurements. For the measurements, a prototypical implementation of IEEE 802.11p was deployed in two roadside units (RSUs) along a highway in Austria. The required signal-to-noise ratio (SNR) for achieving a frame-error-ratio (FER) less than 0.1 is estimated from measurements for various configurations of data rate, packet length, and vehicle speed. Evaluations show that for a RSU with an antenna mounted at a low height (1.8m) the required SNR depends on the packet length. This is not the case for a RSU, where the antenna is mounted higher (7.1 m). Further the averaged required SNR over all different parameter settings for the low RSU is 4.6 dB larger compared to the required SNR for the high RSU.
{"title":"Performance evaluation of IEEE 802.11p physical layer infrastructure-to-vehicle real-world measurements","authors":"A. Paier, Daniele Faetani, C. Mecklenbrauker","doi":"10.1109/ISABEL.2010.5702844","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702844","url":null,"abstract":"We evaluate the physical layer of infrastructure-to-vehicle communications from real-world measurements. For the measurements, a prototypical implementation of IEEE 802.11p was deployed in two roadside units (RSUs) along a highway in Austria. The required signal-to-noise ratio (SNR) for achieving a frame-error-ratio (FER) less than 0.1 is estimated from measurements for various configurations of data rate, packet length, and vehicle speed. Evaluations show that for a RSU with an antenna mounted at a low height (1.8m) the required SNR depends on the packet length. This is not the case for a RSU, where the antenna is mounted higher (7.1 m). Further the averaged required SNR over all different parameter settings for the low RSU is 4.6 dB larger compared to the required SNR for the high RSU.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121274876","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702867
K. Kwak, S. Ullah, N. Ullah
Wireless Body Area Networks (WBAN) has emerged as a key technology to provide real-time health monitoring of a patient and to diagnose and treat many life threatening diseases. WBAN operates in close vicinity to, on, or inside a human body and supports a variety of medical and non-medical applications. IEEE 802 has established a Task Group called IEEE 802.15.6 for the standardization of WBAN. The purpose of the group is to establish a communication standard optimized for low-power in-body/on-body nodes to serve a variety of medical and non-medical applications. This paper explains the most important features of the new IEEE 802.15.6 standard. The standard defines a Medium Access Control (MAC) layer supporting several Physical (PHY) layers. We briefly overview the PHY and MAC layers specifications together with the bandwidth efficiency of IEEE 802.15.6 standard. We also discuss the security paradigm of the standard.
{"title":"An overview of IEEE 802.15.6 standard","authors":"K. Kwak, S. Ullah, N. Ullah","doi":"10.1109/ISABEL.2010.5702867","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702867","url":null,"abstract":"Wireless Body Area Networks (WBAN) has emerged as a key technology to provide real-time health monitoring of a patient and to diagnose and treat many life threatening diseases. WBAN operates in close vicinity to, on, or inside a human body and supports a variety of medical and non-medical applications. IEEE 802 has established a Task Group called IEEE 802.15.6 for the standardization of WBAN. The purpose of the group is to establish a communication standard optimized for low-power in-body/on-body nodes to serve a variety of medical and non-medical applications. This paper explains the most important features of the new IEEE 802.15.6 standard. The standard defines a Medium Access Control (MAC) layer supporting several Physical (PHY) layers. We briefly overview the PHY and MAC layers specifications together with the bandwidth efficiency of IEEE 802.15.6 standard. We also discuss the security paradigm of the standard.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127800944","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702795
S. Kelly, P. Doyle, A. Priplata, Oscar Mendoza, J. Wyatt
A retinal prosthesis telemetry system is examined, and several methods are explored to optimize the size of the external primary telemetry coil to maximize the wireless delivery of power to an implanted secondary coil of constrained size. A simplified version of the Biot-Savart Law is used to give a first-pass optimal primary coil size for a small secondary coil. Numerical integration is then used to improve the optimization for larger secondary coils, and this calculation is repeated across a range of secondary coil radii. Finally, the effects of eye rotation angle are explored, with the future goal of expanding the optimization techniques to cover the predicted range of angular eye excursions.
{"title":"Optimal primary coil size for wireless power telemetry to medical implants","authors":"S. Kelly, P. Doyle, A. Priplata, Oscar Mendoza, J. Wyatt","doi":"10.1109/ISABEL.2010.5702795","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702795","url":null,"abstract":"A retinal prosthesis telemetry system is examined, and several methods are explored to optimize the size of the external primary telemetry coil to maximize the wireless delivery of power to an implanted secondary coil of constrained size. A simplified version of the Biot-Savart Law is used to give a first-pass optimal primary coil size for a small secondary coil. Numerical integration is then used to improve the optimization for larger secondary coils, and this calculation is repeated across a range of secondary coil radii. Finally, the effects of eye rotation angle are explored, with the future goal of expanding the optimization techniques to cover the predicted range of angular eye excursions.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128135965","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702904
S. Badillo, T. Vincent, P. Ciuciu
Inter-subject analysis of functional Magnetic Resonance Imaging (fMRI) data relies on single intra-subject studies, which are usually conducted using a massively univariate approach. In this paper, we investigate the impact of an improved intra-subject analysis on group studies. Our approach is based on the use of Adaptive Spatial Mixture Models within a joint detection-estimation (JDE) framework [1]. In this setting, spatial variability is achieved at a regional scale by the explicit characterization of the hemodynamic filter and at the voxel scale by an adaptive spatial correlation model between condition-specific effects. For the group statistics, we conducted several Random effect analyses (RFX) which relied either on SPM or JDE intra-subject analyses. We performed a comparative study on two different real datasets involving the same paradigm and the same 15 subjects but eliciting different noise levels by varying the acceleration factor (R=2 and R=4) in parallel MRI acquisition. We show that brain activations appear more spatially resolved using JDE instead of SPM and that a better sensitivity is achieved. Moreover, the JDE framework provides more robust detection performance by maintaining satisfying results on our most noisy real dataset.
{"title":"Spatially adaptive subject level analyses improve random effects fMRI group studies","authors":"S. Badillo, T. Vincent, P. Ciuciu","doi":"10.1109/ISABEL.2010.5702904","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702904","url":null,"abstract":"Inter-subject analysis of functional Magnetic Resonance Imaging (fMRI) data relies on single intra-subject studies, which are usually conducted using a massively univariate approach. In this paper, we investigate the impact of an improved intra-subject analysis on group studies. Our approach is based on the use of Adaptive Spatial Mixture Models within a joint detection-estimation (JDE) framework [1]. In this setting, spatial variability is achieved at a regional scale by the explicit characterization of the hemodynamic filter and at the voxel scale by an adaptive spatial correlation model between condition-specific effects. For the group statistics, we conducted several Random effect analyses (RFX) which relied either on SPM or JDE intra-subject analyses. We performed a comparative study on two different real datasets involving the same paradigm and the same 15 subjects but eliciting different noise levels by varying the acceleration factor (R=2 and R=4) in parallel MRI acquisition. We show that brain activations appear more spatially resolved using JDE instead of SPM and that a better sensitivity is achieved. Moreover, the JDE framework provides more robust detection performance by maintaining satisfying results on our most noisy real dataset.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303560","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702802
M. Lakshmanan, D. D. Ariananda, H. Nikookar
Wavelet packet transform is a recent addition to the rich arsenal of the signal processing tool box. In this article, we investigate the application of wavelet packet transform as a novel spectral analysis tool. The estimator is realized by a tree structure obtained by cascading a pair of half-band high and low pass filters. The main attraction for wavelet packets (WP) is the tradeoffs they offer in terms of satisfying various performance metrics such as frequency resolution, side lobe suppression and variance of the estimated power spectral density (PSD). Furthermore, the state of art in the application of wavelet transform for spectrum estimation is carried forward by bringing in a few optimizations which correct undesirable edge based artifacts that occur in the standard implementations. The systems are evaluated through simulation studies the results of which show that the proposed wavelet based approach offers great flexibility and adaptability apart from its performances which are significantly better than Fourier based estimates.
{"title":"On the edge based artifact mitigation in wavelet packet transform for enhancement of spectral estimation","authors":"M. Lakshmanan, D. D. Ariananda, H. Nikookar","doi":"10.1109/ISABEL.2010.5702802","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702802","url":null,"abstract":"Wavelet packet transform is a recent addition to the rich arsenal of the signal processing tool box. In this article, we investigate the application of wavelet packet transform as a novel spectral analysis tool. The estimator is realized by a tree structure obtained by cascading a pair of half-band high and low pass filters. The main attraction for wavelet packets (WP) is the tradeoffs they offer in terms of satisfying various performance metrics such as frequency resolution, side lobe suppression and variance of the estimated power spectral density (PSD). Furthermore, the state of art in the application of wavelet transform for spectrum estimation is carried forward by bringing in a few optimizations which correct undesirable edge based artifacts that occur in the standard implementations. The systems are evaluated through simulation studies the results of which show that the proposed wavelet based approach offers great flexibility and adaptability apart from its performances which are significantly better than Fourier based estimates.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134014618","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702810
A. Bernardino, E. Bernardino, J. M. Sánchez-Pérez, J. Gómez-Pulido, M. A. Vega-Rodríguez
When managed properly, the ring networks are uniquely suited to deliver a large amount of bandwidth in a reliable and inexpensive way. An optimal load balancing is very important, because it increases the system capacity and improves the overall ring performance. An important optimisation problem in this context is the Weighted Ring Arc Loading Problem (WRALP). It consists of the design, in a communication network of a transmission route (direct path) for each request, such that high load on the ring arcs will be avoided. WRALP asks for a routing scheme such that the maximum load on the ring arcs will be minimum. In this paper we study WRALP without demand splitting and we propose a Hybrid Population-based Incremental Learning (HPBIL) to solve it. We show that HPBIL is able to achieve good solutions, improving the results obtained by previous approaches.
{"title":"A Hybrid Population-Based Incremental Learning algorithm for load balancing in RPR","authors":"A. Bernardino, E. Bernardino, J. M. Sánchez-Pérez, J. Gómez-Pulido, M. A. Vega-Rodríguez","doi":"10.1109/ISABEL.2010.5702810","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702810","url":null,"abstract":"When managed properly, the ring networks are uniquely suited to deliver a large amount of bandwidth in a reliable and inexpensive way. An optimal load balancing is very important, because it increases the system capacity and improves the overall ring performance. An important optimisation problem in this context is the Weighted Ring Arc Loading Problem (WRALP). It consists of the design, in a communication network of a transmission route (direct path) for each request, such that high load on the ring arcs will be avoided. WRALP asks for a routing scheme such that the maximum load on the ring arcs will be minimum. In this paper we study WRALP without demand splitting and we propose a Hybrid Population-based Incremental Learning (HPBIL) to solve it. We show that HPBIL is able to achieve good solutions, improving the results obtained by previous approaches.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134561469","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702894
P. Brady, Martin Hill, Joseph Connell, John Barrett, B. Fennessy, P. O'sullivan, D. O'Hare
This paper investigates the effects of drill speed, burr type, burr style, and stroke speed on the acoustics that are generated from a surgical drill when dissecting the squamous temporal bone region. Multivariate regression is used to analyse and predict the Mel frequency cepstrum of the audio that is generated during the procedure. It is seen that each of drilling parameters along with their higher order interaction terms has a significant affect on the acoustic drilling signature of the squamous temporal bone. Furthermore, it was established, for the first time, that a categorical multivariate regressive model could consistently predict the Mel frequency cepstrum of the squamous temporal bone with accuracy of 97.78% with only 2 seconds of audio training data. This represents a significant advance on previously reported work.
{"title":"The effects of drilling parameters on the acoustic drilling signature of the squamous temporal bone: A categorical multivariate regressive analysis","authors":"P. Brady, Martin Hill, Joseph Connell, John Barrett, B. Fennessy, P. O'sullivan, D. O'Hare","doi":"10.1109/ISABEL.2010.5702894","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702894","url":null,"abstract":"This paper investigates the effects of drill speed, burr type, burr style, and stroke speed on the acoustics that are generated from a surgical drill when dissecting the squamous temporal bone region. Multivariate regression is used to analyse and predict the Mel frequency cepstrum of the audio that is generated during the procedure. It is seen that each of drilling parameters along with their higher order interaction terms has a significant affect on the acoustic drilling signature of the squamous temporal bone. Furthermore, it was established, for the first time, that a categorical multivariate regressive model could consistently predict the Mel frequency cepstrum of the squamous temporal bone with accuracy of 97.78% with only 2 seconds of audio training data. This represents a significant advance on previously reported work.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125451174","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702793
A. Beriain, A. Vaz, I. Rebollo, I. Zalbide, J. F. Sevillano, R. Berenguer
There is a strong motivation for the implementation of electronic identification systems and wireless sensors in hospitals. This work presents a sensor enabled passive RFID tag for patient monitorization. Special attention is paid to the analog FE, which has been designed and implemented in a low cost 0.35µm CMOS standard process. The proposed front-end architecture allows the implementation of power management techniques that, together with the power optimized blocks and the use of Schottky diodes in the voltage multiplier, achieves a long reading range. The fabricated analog front-end, assembled to a matched dipole antenna, is able to provide a wireless communication up to 2.4m from a 2W EIRP output power reader to a digital module+sensor with an average power consumption up to 37.5µW. The system has been tested with a temperature sensor. Successful ID and temperature communication with a commercial RFID reader over a distance of approximately 2m has been reported. The results demonstrate the capacity of the proposed system for wireless patient monitorization.
在医院实施电子识别系统和无线传感器有很强的动机。这项工作提出了一种用于患者监测的传感器使能的无源RFID标签。特别关注模拟有限元，它已经在低成本的0.35 μ m CMOS标准工艺中设计和实现。所提出的前端架构允许实现电源管理技术，以及功率优化模块和在电压乘法器中使用肖特基二极管，从而实现较长的读取范围。预制的模拟前端与匹配的偶极子天线组装在一起，能够提供从2W EIRP输出功率读取器到数字模块+传感器之间长达2.4m的无线通信，平均功耗高达37.5 μ W。该系统已经用温度传感器进行了测试。据报道，在大约2米的距离上，成功地与商用RFID读取器进行ID和温度通信。实验结果证明了所提出的无线病人监护系统的能力。
{"title":"Wireless patient monitorization using full passive devices","authors":"A. Beriain, A. Vaz, I. Rebollo, I. Zalbide, J. F. Sevillano, R. Berenguer","doi":"10.1109/ISABEL.2010.5702793","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702793","url":null,"abstract":"There is a strong motivation for the implementation of electronic identification systems and wireless sensors in hospitals. This work presents a sensor enabled passive RFID tag for patient monitorization. Special attention is paid to the analog FE, which has been designed and implemented in a low cost 0.35µm CMOS standard process. The proposed front-end architecture allows the implementation of power management techniques that, together with the power optimized blocks and the use of Schottky diodes in the voltage multiplier, achieves a long reading range. The fabricated analog front-end, assembled to a matched dipole antenna, is able to provide a wireless communication up to 2.4m from a 2W EIRP output power reader to a digital module+sensor with an average power consumption up to 37.5µW. The system has been tested with a temperature sensor. Successful ID and temperature communication with a commercial RFID reader over a distance of approximately 2m has been reported. The results demonstrate the capacity of the proposed system for wireless patient monitorization.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134089718","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702842
C. Spiegel, Sebastian Rickers, G. Bruck, P. Jung
In practical communication systems, frequency offsets between transmitters and receivers cannot be avoided. Both transmitter and receiver require local clocks which are usually derived from independent crystal oscillators. Typical low-cost crystals show a relative frequency tolerance of 20 ppm. Though devices with less tolerance are available, they are too expensive for most mass market devices. It is rather desirable to attempt to estimate and correct the frequency offset at the receiver side, preferably in digital domain. For regular sampling based receivers, such algorithms can be considered well-known [1]. However, for irregular sampling schemes such as zero-crossing demodulation, neither the impact on the receiver performance nor ways of estimating and correcting frequency offsets are widely known. This manuscript is a first attempt to close this gap.
{"title":"Impact of frequency offsets on zero crossing demodulation based receivers","authors":"C. Spiegel, Sebastian Rickers, G. Bruck, P. Jung","doi":"10.1109/ISABEL.2010.5702842","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702842","url":null,"abstract":"In practical communication systems, frequency offsets between transmitters and receivers cannot be avoided. Both transmitter and receiver require local clocks which are usually derived from independent crystal oscillators. Typical low-cost crystals show a relative frequency tolerance of 20 ppm. Though devices with less tolerance are available, they are too expensive for most mass market devices. It is rather desirable to attempt to estimate and correct the frequency offset at the receiver side, preferably in digital domain. For regular sampling based receivers, such algorithms can be considered well-known [1]. However, for irregular sampling schemes such as zero-crossing demodulation, neither the impact on the receiver performance nor ways of estimating and correcting frequency offsets are widely known. This manuscript is a first attempt to close this gap.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133551031","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 : 2010-11-01DOI: 10.1109/ISABEL.2010.5702883
Mohieddine El Soussi
We1 consider the problem of two transmitters would like to communicate with a destination with the help of a half-duplex relay. In this work, we are presenting the advantages of using nested lattices for the AWGN channels. The sources map their messages using lattice code and then broadcast them to the relay and the destination. The relay receives two independent symbols at the same channel. The relay either combines the two symbols using lattice modulo and then decode or decode the two symbols separately also using modulo lattice, then forwards the new symbol to the destination. The destination tries to recover the two messages using different decoding strategies. One of the strategies is to recover two linear equations in function of the two received symbols with integer coefficients then, solve these equations to recover the two messages. The integer coefficients need to be optimally selected to reduce the noise at the receivers. The other strategy is to use successive decoding at the relay and the destination. This strategy outperforms the first when two integer coefficients are zero. The strategies are discussed and compared with the traditional DF (Decode and Forward). The simulation results show the advantages of using lattice codes and the improvement in rates for certain regimes.
{"title":"Network coding for the Multiple Access Relay channel using lattices","authors":"Mohieddine El Soussi","doi":"10.1109/ISABEL.2010.5702883","DOIUrl":"https://doi.org/10.1109/ISABEL.2010.5702883","url":null,"abstract":"We1 consider the problem of two transmitters would like to communicate with a destination with the help of a half-duplex relay. In this work, we are presenting the advantages of using nested lattices for the AWGN channels. The sources map their messages using lattice code and then broadcast them to the relay and the destination. The relay receives two independent symbols at the same channel. The relay either combines the two symbols using lattice modulo and then decode or decode the two symbols separately also using modulo lattice, then forwards the new symbol to the destination. The destination tries to recover the two messages using different decoding strategies. One of the strategies is to recover two linear equations in function of the two received symbols with integer coefficients then, solve these equations to recover the two messages. The integer coefficients need to be optimally selected to reduce the noise at the receivers. The other strategy is to use successive decoding at the relay and the destination. This strategy outperforms the first when two integer coefficients are zero. The strategies are discussed and compared with the traditional DF (Decode and Forward). The simulation results show the advantages of using lattice codes and the improvement in rates for certain regimes.","PeriodicalId":165367,"journal":{"name":"2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116719471","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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