Telecommunications and Networks Research Leader. Member of the Mexican Academy of Sciences, Member of the Academy of Engineering of Mexico, Member SNI level II
Due to the importance of call generation and mobility in a CDMA network, a model to quantify the ... more Due to the importance of call generation and mobility in a CDMA network, a model to quantify the effects on the handoff and new calls when resources such as capacity, reservation, demand, and mobility vary is needed. In this paper a new simulation and analytical approximation model for performance evaluation of soft handoff and new calls in a CDMA environment system is proposed in order to characterize the behavior of the user's mobility.
A semi-blind algorithm based on expectation propagation (EP) is proposed for multi-cell massive M... more A semi-blind algorithm based on expectation propagation (EP) is proposed for multi-cell massive MIMO systems with spatially and temporally correlated channels. The performance of the algorithm in channel estimation and data detection is obtained from simulations and compared to other approaches. The results show that with only K pilots, where K is the number of users in the cell, the channel estimation performance of the proposed method approaches a lower bound as the number of BS antennas or the number of data symbols per frame increase. As expected, for time-varying channels, the proposed algorithm clearly outperforms those designed for block-fading channel models.
In this chapter, different applications of vehicular communications will be shown. The different ... more In this chapter, different applications of vehicular communications will be shown. The different methodologies covered in previous chapters will be applied to specific scenarios with different applications, analysing the results of each of the different case studies, and presenting the advantages and disadvantages of each of them for different applications. The significance of radio wave propagation modelling will be described with different case studies of complex scenarios in vehicular environments.
One of the most relevant challenge of Smart Cities is an effective transport service in terms of ... more One of the most relevant challenge of Smart Cities is an effective transport service in terms of safety, mobility, environment and data. In this sense, it is important to investigate the vehicular propagation by means of 3D deterministic tools in urban scenarios, for Intelligent Transportation System (ITS) applications. In this work, the vehicle-to-infrastructure (V2I) radio wave propagation for an urban infrastructure wireless communication system has been assessed for 5.9 Ghz. A realistic urban scenario has been implemented in an in-house 3D Ray Launching algorithm and Large-Scale and Small-Scale analysis are presented and discussed. Results and analysis provide useful information for optimal node location in the planning phase of radio communication deployment.
The interest for making vehicular transportation safer and more efficient has increased exponenti... more The interest for making vehicular transportation safer and more efficient has increased exponentially in recent years. To develop such vehicular communication systems, accurate models for the propagation channel are needed. This work analyzes the channel properties of different wireless communication systems within a vehicular communication environment with deterministic modeling. Three different frequencies have been analyzed: 868MHz, 2.4GHz and 5.9GHz. An in-house 3D Ray Launching code has been used for that purpose, taking into account the movement of the vehicles, leading to time and space-frequency models. Results present the great influence of multipath propagation in these type of environments, leading to a great aid in the identification of the optimal location of the transceivers, in order to minimize power consumption and increase overall service performance.
Due to the importance of call generation and mobility in a CDMA network, a model to quantify the ... more Due to the importance of call generation and mobility in a CDMA network, a model to quantify the effects on the handoff and new calls when resources such as capacity, reservation, demand, and mobility vary is needed. In this paper a new simulation and analytical approximation model for performance evaluation of soft handoff and new calls in a CDMA environment system is proposed in order to characterize the behavior of the user's mobility.
A semi-blind algorithm based on expectation propagation (EP) is proposed for multi-cell massive M... more A semi-blind algorithm based on expectation propagation (EP) is proposed for multi-cell massive MIMO systems with spatially and temporally correlated channels. The performance of the algorithm in channel estimation and data detection is obtained from simulations and compared to other approaches. The results show that with only K pilots, where K is the number of users in the cell, the channel estimation performance of the proposed method approaches a lower bound as the number of BS antennas or the number of data symbols per frame increase. As expected, for time-varying channels, the proposed algorithm clearly outperforms those designed for block-fading channel models.
In this chapter, different applications of vehicular communications will be shown. The different ... more In this chapter, different applications of vehicular communications will be shown. The different methodologies covered in previous chapters will be applied to specific scenarios with different applications, analysing the results of each of the different case studies, and presenting the advantages and disadvantages of each of them for different applications. The significance of radio wave propagation modelling will be described with different case studies of complex scenarios in vehicular environments.
One of the most relevant challenge of Smart Cities is an effective transport service in terms of ... more One of the most relevant challenge of Smart Cities is an effective transport service in terms of safety, mobility, environment and data. In this sense, it is important to investigate the vehicular propagation by means of 3D deterministic tools in urban scenarios, for Intelligent Transportation System (ITS) applications. In this work, the vehicle-to-infrastructure (V2I) radio wave propagation for an urban infrastructure wireless communication system has been assessed for 5.9 Ghz. A realistic urban scenario has been implemented in an in-house 3D Ray Launching algorithm and Large-Scale and Small-Scale analysis are presented and discussed. Results and analysis provide useful information for optimal node location in the planning phase of radio communication deployment.
The interest for making vehicular transportation safer and more efficient has increased exponenti... more The interest for making vehicular transportation safer and more efficient has increased exponentially in recent years. To develop such vehicular communication systems, accurate models for the propagation channel are needed. This work analyzes the channel properties of different wireless communication systems within a vehicular communication environment with deterministic modeling. Three different frequencies have been analyzed: 868MHz, 2.4GHz and 5.9GHz. An in-house 3D Ray Launching code has been used for that purpose, taking into account the movement of the vehicles, leading to time and space-frequency models. Results present the great influence of multipath propagation in these type of environments, leading to a great aid in the identification of the optimal location of the transceivers, in order to minimize power consumption and increase overall service performance.
Radio Frequency Identification (RFID) plays an important role in Warehouse Management, especially... more Radio Frequency Identification (RFID) plays an important role in Warehouse Management, especially during the automatic identification of items. Unfortunately, a warehouse environment has electromagnetic interferences causing read failures in the RFID system. We propose a method for the identification of multiple RFID tags based on accumulated Hamming distances.
Uploads