At millimeter-waves, the home furniture and objects dimensions can be equal or superior to the wa... more At millimeter-waves, the home furniture and objects dimensions can be equal or superior to the wavelength. A comparison between propagation measurements conducted within a residential house for two configurations, furnished and empty, underscores the influence of the furniture on the millimeter-waves propagation.
This paper presents a brief overview of several studies concerning the indoor wireless communicat... more This paper presents a brief overview of several studies concerning the indoor wireless communications at 60 GHz performed by the IETR. The characterization and the modeling of the radio propagation channel are based on several measurement campaigns realized with the channel sounder developed at IETR. Some typical residential environments were also simulated by ray tracing and Gaussian Beam Tracking. The obtained results show a good agreement with the similar experimental results. Currently, the IETR is developing a high data rate wireless communication system operating at 60 GHz. The single-carrier architecture of this system is also presented.
Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152), 2000
This paper presents measurement results and models for 60 GHz channels. Multipath components were... more This paper presents measurement results and models for 60 GHz channels. Multipath components were resolved in time by using a sliding correlator with 10 ns resolution, and in space by sweeping a directional antenna with 7° half power azimuthal beamwidth around the azimuth. Power delay profiles (PDPs) and power angle profiles (PAPs) were measured in various indoor and short-range outdoor environments. Detailed multipath structure was retrieved from PDPs and PAPs, and compared with site-specific environments. Results show an excellent correlation between the propagation environments and the multi-path channel structures. The measurement results confirm that the majority of the multipath components can be determined from image based ray tracing techniques for LOS applications. For NLOS propagation through walls, the metallic structure of composite walls must be considered for propagation predictions. From the recorded PDPs and PAPs, received signal power and statistical parameters of angle-ofarrival (AOA) and time-of-arrival (TOA) were also calculated.
2009 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, 2009
This paper presents a contact-less heartbeat detection system and a cardiopulmonary modeling. Usi... more This paper presents a contact-less heartbeat detection system and a cardiopulmonary modeling. Using a vector network analyzer, our proposed microwave system shows the ability of detecting the heartbeat signal at different frequencies, as well as at different output power levels. Based on parameters extracted from real measurements, a model representing the heartbeat and the respiration signals is presented. Different processing techniques are used in order to separate the heartbeat and the respiration signals. For different signal to noise ratios, wavelet filters show higher accuracy over classic filters in determining both the heartbeat rate and the heart rate variability.
2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2013
Wireless propagation modeling is more and more needed for optimal indoor coverage in complex en... more Wireless propagation modeling is more and more needed for optimal indoor coverage in complex environment (such as offices, classrooms, etc.). Thus the need to predict electromagnetic propagation efficiently and accurately in the presence of obstacles, allowing engineers to planning efficiently the communicating devices. This paper will present a rigorous electromagnetic indoor propagation modeling based on the FDTD (3D) method taking into account the presence of various obstacles. A comparison between numerical results obtained by FDTD code and Ray Tracing software will be presented and compared with measurement results. Computational performance efficiency of these methods will also be discussed.
This paper presents some results of a study concerning the radio propagation at 60 GHz in residen... more This paper presents some results of a study concerning the radio propagation at 60 GHz in residential environments performed by the IETR (Electronic and Telecommunication Institute of Rennes, France). This study is part of a RNRT 1 project named "COMMINDOR" 2. This exploratory project concerns the very high data rate (155 Mbps) and small range (about 10 m) radio communication systems for future home networks, which will permit multimedia equipment interconnection and control. The study is based on several measurement campaigns realized with a channel sounder based on the sliding correlation technique. This channel sounder has a 500 MHz bandwidth and a 2.3 ns effective time resolution. The measurements have been performed in residential furnished environments. The study of the angles-of-arrival (AOA) emphases the importance of openings (such as doors, staircase, etc.) for the radio propagation between adjacent rooms. A particular attention is paid to the influence of human activity on radio propagation. It is shown that people movements can make the propagation channel unavailable during about one second. From the characterization study of the indoor radio propagation, several recommendations concerning the deployment of the very high data rate 60 GHz wireless networks are derived.
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2010
This paper presents a system for touch-less heartbeat detection and a cardiopulmonary signal mode... more This paper presents a system for touch-less heartbeat detection and a cardiopulmonary signal modeling approach. Using a vector network analyzer, a microwave system is tested for the detection of the heartbeat signal at a distance of 1 m from a person. The proposed system shows the ability of detecting the heartbeat signals with the possibility of tuning both frequency and power. Measurements are performed at 2.4, 5.8, 10, 16, and 60 GHz, as well as at different power levels between 0 and -27 dBm. Based on measurements performed for both respiration and heart beatings, a model of the measured signals representing the cardiopulmonary activity is presented. The heartbeat rate and the heart rate variability are extracted from the modeling signal using wavelet and classic filters, for SNR between 0 and -20 dB.
2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2013
Wireless propagation modeling is more and more needed for optimal indoor coverage in complex en... more Wireless propagation modeling is more and more needed for optimal indoor coverage in complex environment (such as offices, classrooms, etc.). Thus the need to predict electromagnetic propagation efficiently and accurately in the presence of obstacles, allowing engineers to planning efficiently the communicating devices. This paper will present a rigorous electromagnetic indoor propagation modeling based on the FDTD (3D) method taking into account the presence of various obstacles. A comparison between numerical results obtained by FDTD code and Ray Tracing software will be presented and compared with measurement results. Computational performance efficiency of these methods will also be discussed.
This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless com... more This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless communications system. The system uses a simple single carrier architecture. The receiver architecture is based on a differential demodulation which minimizes the intersymbol interference (ISI) effect and a signal processing unit composed of a joint frame and byte synchronization block and a
In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the conte... more In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the context of an indoor residential environment. Using an optimized 3D ray tracing tool, the multipleinput multiple-output (MIMO) propagation channel is simulated. The algorithm of singular value decomposition is applied and a new transmission scheme is considered. Comparisons of cases with/without TxBF are realized by analyzing the received power, the signal to noise ratio () of each spatial stream and the channel capacity. It is shown that the TxBF capacity gain increases when the MIMO channel correlation at the transmit side reaches high values, especially when only the dominant eigen mode is selected. The main result concerns the antenna spacing: a judicious choice of the transmitting antenna spacing can improve the effective transmission range by more than 45% in non-line of sight (NLOS) conditions. Several MIMO configurations (number of antennas and spatial streams) are also compared to determine the relevance of a possible activation of TxBF. The interference influence is studied and it is shown that under some conditions, TxBF improves the signal to interference ratio (SIR).
IEEE 802.11n standard came as a rescue; the existing standards are increasingly seen as inadequat... more IEEE 802.11n standard came as a rescue; the existing standards are increasingly seen as inadequate since applications become more complex and require more bandwidth. Several techniques have been put into operation to meet two basic requirements: significantly greater bit rate and radio coverage. However, studies have shown that the theoretical limit in terms of throughput is far from being reached and that the received power does not explain the performance degradation. A list of suspect parameters is analyzed in this paper to assess their effect on performance of the IEEE 802.11n physical layer taken as an application of MIMO technology in indoor context. It is shown that for values of angular spread below 27°, the data rate cannot exceed 117 Mbps and the antennas spacing can compensate the performance degradation caused by other parameters. Results are given in terms of correlation coefficient, other channel characteristics and the packet error rate.
Proceedings of IEEE Antennas and Propagation Society International Symposium
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless com... more This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless communications system. The system uses a simple single carrier architecture. The receiver architecture is based on a differential demodulation which minimizes the intersymbol interference (ISI) effect and a signal processing unit composed of a joint frame and byte synchronization block and a
In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the conte... more In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the context of an indoor residential environment. Using an optimized 3D ray tracing tool, the multipleinput multiple-output (MIMO) propagation channel is simulated. The algorithm of singular value decomposition is applied and a new transmission scheme is considered. Comparisons of cases with/without TxBF are realized by analyzing the received power, the signal to noise ratio () of each spatial stream and the channel capacity. It is shown that the TxBF capacity gain increases when the MIMO channel correlation at the transmit side reaches high values, especially when only the dominant eigen mode is selected. The main result concerns the antenna spacing: a judicious choice of the transmitting antenna spacing can improve the effective transmission range by more than 45% in non-line of sight (NLOS) conditions. Several MIMO configurations (number of antennas and spatial streams) are also compared to determine the relevance of a possible activation of TxBF. The interference influence is studied and it is shown that under some conditions, TxBF improves the signal to interference ratio (SIR).
At millimeter-waves, the home furniture and objects dimensions can be equal or superior to the wa... more At millimeter-waves, the home furniture and objects dimensions can be equal or superior to the wavelength. A comparison between propagation measurements conducted within a residential house for two configurations, furnished and empty, underscores the influence of the furniture on the millimeter-waves propagation.
This paper presents a brief overview of several studies concerning the indoor wireless communicat... more This paper presents a brief overview of several studies concerning the indoor wireless communications at 60 GHz performed by the IETR. The characterization and the modeling of the radio propagation channel are based on several measurement campaigns realized with the channel sounder developed at IETR. Some typical residential environments were also simulated by ray tracing and Gaussian Beam Tracking. The obtained results show a good agreement with the similar experimental results. Currently, the IETR is developing a high data rate wireless communication system operating at 60 GHz. The single-carrier architecture of this system is also presented.
Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152), 2000
This paper presents measurement results and models for 60 GHz channels. Multipath components were... more This paper presents measurement results and models for 60 GHz channels. Multipath components were resolved in time by using a sliding correlator with 10 ns resolution, and in space by sweeping a directional antenna with 7° half power azimuthal beamwidth around the azimuth. Power delay profiles (PDPs) and power angle profiles (PAPs) were measured in various indoor and short-range outdoor environments. Detailed multipath structure was retrieved from PDPs and PAPs, and compared with site-specific environments. Results show an excellent correlation between the propagation environments and the multi-path channel structures. The measurement results confirm that the majority of the multipath components can be determined from image based ray tracing techniques for LOS applications. For NLOS propagation through walls, the metallic structure of composite walls must be considered for propagation predictions. From the recorded PDPs and PAPs, received signal power and statistical parameters of angle-ofarrival (AOA) and time-of-arrival (TOA) were also calculated.
2009 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, 2009
This paper presents a contact-less heartbeat detection system and a cardiopulmonary modeling. Usi... more This paper presents a contact-less heartbeat detection system and a cardiopulmonary modeling. Using a vector network analyzer, our proposed microwave system shows the ability of detecting the heartbeat signal at different frequencies, as well as at different output power levels. Based on parameters extracted from real measurements, a model representing the heartbeat and the respiration signals is presented. Different processing techniques are used in order to separate the heartbeat and the respiration signals. For different signal to noise ratios, wavelet filters show higher accuracy over classic filters in determining both the heartbeat rate and the heart rate variability.
2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2013
Wireless propagation modeling is more and more needed for optimal indoor coverage in complex en... more Wireless propagation modeling is more and more needed for optimal indoor coverage in complex environment (such as offices, classrooms, etc.). Thus the need to predict electromagnetic propagation efficiently and accurately in the presence of obstacles, allowing engineers to planning efficiently the communicating devices. This paper will present a rigorous electromagnetic indoor propagation modeling based on the FDTD (3D) method taking into account the presence of various obstacles. A comparison between numerical results obtained by FDTD code and Ray Tracing software will be presented and compared with measurement results. Computational performance efficiency of these methods will also be discussed.
This paper presents some results of a study concerning the radio propagation at 60 GHz in residen... more This paper presents some results of a study concerning the radio propagation at 60 GHz in residential environments performed by the IETR (Electronic and Telecommunication Institute of Rennes, France). This study is part of a RNRT 1 project named "COMMINDOR" 2. This exploratory project concerns the very high data rate (155 Mbps) and small range (about 10 m) radio communication systems for future home networks, which will permit multimedia equipment interconnection and control. The study is based on several measurement campaigns realized with a channel sounder based on the sliding correlation technique. This channel sounder has a 500 MHz bandwidth and a 2.3 ns effective time resolution. The measurements have been performed in residential furnished environments. The study of the angles-of-arrival (AOA) emphases the importance of openings (such as doors, staircase, etc.) for the radio propagation between adjacent rooms. A particular attention is paid to the influence of human activity on radio propagation. It is shown that people movements can make the propagation channel unavailable during about one second. From the characterization study of the indoor radio propagation, several recommendations concerning the deployment of the very high data rate 60 GHz wireless networks are derived.
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2010
This paper presents a system for touch-less heartbeat detection and a cardiopulmonary signal mode... more This paper presents a system for touch-less heartbeat detection and a cardiopulmonary signal modeling approach. Using a vector network analyzer, a microwave system is tested for the detection of the heartbeat signal at a distance of 1 m from a person. The proposed system shows the ability of detecting the heartbeat signals with the possibility of tuning both frequency and power. Measurements are performed at 2.4, 5.8, 10, 16, and 60 GHz, as well as at different power levels between 0 and -27 dBm. Based on measurements performed for both respiration and heart beatings, a model of the measured signals representing the cardiopulmonary activity is presented. The heartbeat rate and the heart rate variability are extracted from the modeling signal using wavelet and classic filters, for SNR between 0 and -20 dB.
2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), 2013
Wireless propagation modeling is more and more needed for optimal indoor coverage in complex en... more Wireless propagation modeling is more and more needed for optimal indoor coverage in complex environment (such as offices, classrooms, etc.). Thus the need to predict electromagnetic propagation efficiently and accurately in the presence of obstacles, allowing engineers to planning efficiently the communicating devices. This paper will present a rigorous electromagnetic indoor propagation modeling based on the FDTD (3D) method taking into account the presence of various obstacles. A comparison between numerical results obtained by FDTD code and Ray Tracing software will be presented and compared with measurement results. Computational performance efficiency of these methods will also be discussed.
This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless com... more This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless communications system. The system uses a simple single carrier architecture. The receiver architecture is based on a differential demodulation which minimizes the intersymbol interference (ISI) effect and a signal processing unit composed of a joint frame and byte synchronization block and a
In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the conte... more In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the context of an indoor residential environment. Using an optimized 3D ray tracing tool, the multipleinput multiple-output (MIMO) propagation channel is simulated. The algorithm of singular value decomposition is applied and a new transmission scheme is considered. Comparisons of cases with/without TxBF are realized by analyzing the received power, the signal to noise ratio () of each spatial stream and the channel capacity. It is shown that the TxBF capacity gain increases when the MIMO channel correlation at the transmit side reaches high values, especially when only the dominant eigen mode is selected. The main result concerns the antenna spacing: a judicious choice of the transmitting antenna spacing can improve the effective transmission range by more than 45% in non-line of sight (NLOS) conditions. Several MIMO configurations (number of antennas and spatial streams) are also compared to determine the relevance of a possible activation of TxBF. The interference influence is studied and it is shown that under some conditions, TxBF improves the signal to interference ratio (SIR).
IEEE 802.11n standard came as a rescue; the existing standards are increasingly seen as inadequat... more IEEE 802.11n standard came as a rescue; the existing standards are increasingly seen as inadequate since applications become more complex and require more bandwidth. Several techniques have been put into operation to meet two basic requirements: significantly greater bit rate and radio coverage. However, studies have shown that the theoretical limit in terms of throughput is far from being reached and that the received power does not explain the performance degradation. A list of suspect parameters is analyzed in this paper to assess their effect on performance of the IEEE 802.11n physical layer taken as an application of MIMO technology in indoor context. It is shown that for values of angular spread below 27°, the data rate cannot exceed 117 Mbps and the antennas spacing can compensate the performance degradation caused by other parameters. Results are given in terms of correlation coefficient, other channel characteristics and the packet error rate.
Proceedings of IEEE Antennas and Propagation Society International Symposium
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless com... more This paper presents the study and the realization at IETR of a high data rate 60 GHz wireless communications system. The system uses a simple single carrier architecture. The receiver architecture is based on a differential demodulation which minimizes the intersymbol interference (ISI) effect and a signal processing unit composed of a joint frame and byte synchronization block and a
In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the conte... more In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the context of an indoor residential environment. Using an optimized 3D ray tracing tool, the multipleinput multiple-output (MIMO) propagation channel is simulated. The algorithm of singular value decomposition is applied and a new transmission scheme is considered. Comparisons of cases with/without TxBF are realized by analyzing the received power, the signal to noise ratio () of each spatial stream and the channel capacity. It is shown that the TxBF capacity gain increases when the MIMO channel correlation at the transmit side reaches high values, especially when only the dominant eigen mode is selected. The main result concerns the antenna spacing: a judicious choice of the transmitting antenna spacing can improve the effective transmission range by more than 45% in non-line of sight (NLOS) conditions. Several MIMO configurations (number of antennas and spatial streams) are also compared to determine the relevance of a possible activation of TxBF. The interference influence is studied and it is shown that under some conditions, TxBF improves the signal to interference ratio (SIR).
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