2013

1. •Dissertation: Hooman Javaheri, “Wireless Transfer of Energy Alongside of Information: From Wireless Sensor Networks to Bio-Enabled Wireless Networks”. [pdf]
   Publisher links: UMI, IRis, ACM Digital Library
   

2012

1. •Thesis Proposal: Hooman Javaheri, “Wireless Transfer of Energy Alongside of Information: From Wireless Sensor Networks to Bio-Enabled Wireless Networks”. [pdf]
   

2. •Hooman Javaheri, Bernardo Barbiellini, Guevara Noubir, “On the Energy Transfer Performance of Mechanical Nanoresonators Coupled with Electromagnetic Fields: Applications with magnetic nanoparticles”, in proceedings of APS March Meeting, March 2012, Boston. [Abstract | Presentation]
   

2011

1. •Hooman Javaheri, Bernardo Barbiellini, and Guevara Noubir, “On the Energy Transfer Performance of Mechanical Nanoresonators Coupled with Electromagnetic Fields” (under review). [arXiv preprint]
   
   Abstract. The energy transfer performance in electrically and magnetically coupled mechanical nanoresonators is studied. Using the resonant scattering theory, we show that magnetically coupled resonators can achieve the same energy transfer performance as for their electrically coupled counterparts, or even outperform them within the scale of interest. Magnetic and electric coupling are compared in the Nanotube Radio, a realistic example of a nano-scale mechanical resonator. The energy transfer performance is discussed for magnetic coupling in magnetic nanoparticles.
   

2. •Hooman Javaheri, Bernardo Barbiellini, Guevara Noubir, “Efficient Magnetic Torque Transduction in Biological Environments using Tunable Nanomechanical Resonators”, in proceedings of 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC ’11), Aug-Sept 2011. [pdf]
   
   Abstract. Electromagnetic interactions with biological systems promise new possibilities in medical applications and synthetic biology. Creating a controlled action in biological systems requires an efficient transduction of the electromagnetic energy to thermal or mechanical biosignals. In this paper, we present the design and optimization for a nanoscale magnetic torque transducer based on a tunable nanomechanical resonator. Operating in resonance regime allows the presented system to efficiently absorb a large amount of energy from the source. In addition, systems tuned on well separated resonance frequencies may operate simultaneously with- out any interference. We describe the theoretical model of the system and show the possibility of achieving the resonance in biological settings for a system with reasonable dimensions.
   

2010

1. •Hooman Javaheri, Guevara Noubir, "iPoint: A Platform-independent Passive Information Kiosk for Cell Phones", in proceedings of 7th Annual IEEE Communications Society Conference on Sensor Mesh and Ad Hoc Communications and Networks (SECON ’10), June 2010. [pdf]    
   
   Abstract. We introduce iPoint, a passive device that can interact and deliver information to virtually any mobile phone equipped with a WiFi network interface and a camera. The iPoint does not need any battery but harvests energy from the phone WiFi transmissions. The iPoint delivers information to the mobile phone through a low power LCD display that can be captured and processed by a software application. We introduce a mechanism of Packet Width Modulation (PWM) to encode the phone requests in the length of WiFi packets. This allows the use of phones not equipped with RFID readers, and still allows the ultralow-power microcontroller to decode the information. In this paper, we describe the architecture of iPoint, discuss the design choices of each component, and report on the experimental evaluation of our prototype. Various Radio-Frequency energy harvesters are discussed and a WiFi tailored, modified Greinacher voltage multiplier, a highly efficient parallel full-wave rectifier, is designed, prototyped and fully characterized. It features an energy-harvesting efficiency of up to 72% and collecting up to 2.5mW from a phone WiFi transmission. An ultralow-power micro-controller with LCD capability (TI MSP430F417) is optimized, and customized to interface with our RF Front End (RF-FE). A PWM demodulator is designed, as an integral part of the energy-harvester, and interfaced with the microcontroller. Finally, the mobile phone application for decoding the LCD output is presented. The evaluation is based on actual measurements carried on the third generation of prototypes we built.
   
   A demo version of this paper (doi: 10.1109/SECON.2010.5508220) and a designed prototype were presented in the demonstration session of the conference.
   

2. •Yin Wang, Hooman Javaheri, Guevara Noubir, “Distributed Link Bonding for Hybrid Wireless Networks”, IEEE Transactions of Mobile Computing. (under review)
   

3. •Hooman Javaheri, Yin Wang, Guevara Noubir, “Distributed Cooperation and Diversity for Hybrid Wireless Networks", in Proceedings of WWIC 2010. (Also, Lecture Notes in Computer Science, 2010, Volume 6074, Pages 27-39) [pdf]
   
   Abstract. In this paper, we propose a new Distributed Cooperation and Diversity Combining framework. Our focus is heterogeneous networks with devices equipped with two types of radio frequency (RF) links: short-range high-rate interface (e.g., IEEE802.11), and a long-range low-rate interface (e.g., cellular) communicating in fading channels. Within this framework, we propose and evaluate a set of distributed cooperation techniques operating at different hierarchical levels with resource constraints such as short-range RF bandwidth. We propose a Priority Maximum-Ratio Combining (PMRC) for pre-demodulation combining, a post soft-demodulation combining, and a decode-and-forward technique. We show that the proposed techniques achieve significant improvements on Signal to Noise Ratio (SNR), Bit Error Rate (BER) and throughput through analysis, simulation, and experimentation on our platform prototype. Our results also indicate that, under several communication scenarios we are considering, PMRC can improve the throughput performance by over an order of magnitude.
   

2009

1. •Hooman Javaheri, Guevara Noubir, Sanna Noubir, “RF Control of Biological Systems: Applications to Wireless Sensor Networks”, in Proceedings of Nano-Net 2009. (Also, Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 1, Volume 20, Part 1, Pages 39-45) [pdf]
   
   Abstract. We present a vision and preliminary results for a combined RF-Biological Systems where the Electro-Magnetic energy of RF signals transduced into control-signals for biological signaling-processes. We show how such systems can be used to build extremely low-power sensor networks. We present our approach and propose a system architecture constituted of a passive RF Front End (RF-FE), Bio-Mechanical Signal Interpreter (BMSI), and a Low Power Sensor Node. We show preliminary results for the performance of our RF-FE prototype, outline design alternatives for the BMSI, and summarize theoretical results for characterizing the BMSI components performance.
   

2007

1. •Hooman Javaheri, Yin Wang, Guevara Noubir, "Cross-Layer Distributed Diversity for Heterogeneous Wireless Networks", in Proceedings of WWIC 2007. (Also, Lecture Notes in Computer Science, 2007, Volume 4517, Pages 259-270) [pdf]
   
   Abstract. In this paper, we introduce a cross-layer diversity framework for multi-air interface wireless communication devices. As an initial step, we focus on devices, of the cellular phones type, that have both long-range relatively low-rate communication air-interface (e.g., GSM) and short-range high-rate communication air-interface (e.g., IEEE802.11). The devices can cooperate through the energy-efficient high-rate interface to improve the performance of the long-range interface. Within this framework we propose a distributed signal-combining technique that accounts for the limited bandwidth of the short-range communication: Threshold Maximum Ratio Combining. We analytically derive the probability distribution function of the signal to noise ratio (SNR) of the combined signals as a function of the number of involved devices and show that significant improvement of the SNR is achievable which translates into a reduction of the overall system outage probability.
   

2005

1. •M. Tabesh, A. Arbabian, H. Javaheri, A. Jalali, “Rural Telecommunications in Iran: A Hybrid Solution" in Proceedings of the First International Conference on Internet Technologies and Applications (ITA05), Wrexham, UK, 7-9 Sept. 2005, pp 530-540 [pdf].
   
   Abstract. The necessity of the development of ICT in rural areas has become a major issue in the developing countries for some time now. Iran, one of the participants of this movement, plans to take some significant short-term steps in this field, steps which will revolve the situation of it’s rural ICT extensively. One of the main related issues in Iran is the large number of geographical situations present in rural parts demanding distinct telecommunication solutions. Having studied thoroughly the current situation of rural telecommunication in Iran and also the available and the newly introduced technical solutions, in this article we propose a complete telecommunication plan for rural Iran that covers the majority of villages. As an example a typical rural scenario present is introduced and a brief discussion is dedicated to clearly discuss a suitable access solution. The proposed guidelines are currently being utilized in some parts of the country and the outcome is being analyzed by the authors to judge on the performance of the proposal.