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We propose a modified diffusion strategy for parameter estimation in sensor networks where nodes exchange information over fading wireless channels. We show that the effect of fading can be mitigated by incorporating local equalization coefficients into the diffusion process. We explain how the equalization coefficients are chosen and show that the (mean) stability of the network continues to be insensitive...
Tone injection (TI) mitigates the high peak-to-average power ratio problem without incurring data rate loss or extra side information. However, optimal TI requires an exhaustive search over all possible constellations, which is a hard optimization problem. In this paper, a novel TI scheme that uses the clipping noise to find the optimal equivalent constellations is proposed. By minimizing the mean...
The knowledge of the propagation environment can greatly improve the performance of indoor wireless localization systems, since it can be exploited to cancel out, at least to some extent, the effects of physical obstructions (e.g., walls) degrading the radio signals employed for localization. In indoor localization systems, the propagation environment can be described by maps (e.g., floor plans),...
We report on terahertz wireless communication experiments at 0.2 THz, using a commercial GaAs field-effect-transistor as detector. For the first time, we will present the transmission of pseudo-random bit sequence at 0.2 THz using this commercial transistor and demonstrate open eye-patterns up to 1.5 Gbps. This transistor is integrated into a machined horn, so that its sensitivity is improved to 1...
Broadband penetration in developing countries such as India is still very low, especially in rural areas, because of the prohibitive cost of laying cable and fiber. Recently, wireless solutions based on Wi-Fi have been proposed as a cost-effective solution to bridge the last-mile problem. However, Wi-Fi normally operates in the 2.4 GHz band and above, where signal propagation is not as good as in...
There is a growing interest in energy efficient or so-called “green” wireless communication to reduce the energy consumption in cellular networks. Since today's wireless terminals are typically equipped with multiple network access interfaces such as Bluetooth, Wi-Fi, and cellular networks, this paper investigates user terminals cooperating with each other in transmitting their data packets to a base...
Localization is the crucial problem for mobile robot navigation. For indoor mobile robot, since a global positioning system (GPS) is incapable, another promising technique to detect the position is the received signal strength indicator (RSSI) from wireless communication. To improve the precision and robustness of mobile unit localization, an inertial measurement unit (IMU) is normally used. In this...
Thermal management is a significant issue in the design of high power light emitting diodes (LEDs). In this letter, the effect of practical changes in the LED junction temperature on the performance of indoor optical wireless (OW) communication system based orthogonal frequency division multiplexing (OFDM) modulation is studied and analyzed. Junction temperature changes occur due to variations in...
This paper proposes a wearable device for recording various biopotentials for analysis and transmission of analyzed signals from a portable terminal to remote servers. This facilitates the experts to provide guidance from the places they are currently available to where it is required immediately. Portable device is designed using CC2540 network processor supported by wireless sensors for recording...
A high gain and low-power down conversion mixer for short range wireless applications is designed in 0.18 μm complementary metal oxide semiconductor (CMOS) technology. During the design, we have adopted current-bleeding technique and a folded Gilbert topology. The mixer is tested at two frequencies e.g., 2.4 GHz and 5.2 GHz. Simulation results revealed that under 1.8 V power supply, the proposed mixer...
This paper proposes a novel amplify-and-forward with cooperative-jamming (ACJ) scheme. In order to make a balance between secrecy capacity (SC) and energy consumption, we use RSE which is defined as the maximum equivalent SC for each unit of energy consumption to evaluate the performance of wireless communications. This paper shows that although SC increases with energy consumption, RSE is not a monotone...
We describe and discuss some of the current challenges facing radar that result from continued spectral encroachment, which necessitating enhanced robustness to interference, agile waveform-diverse operation, and greater synergy between the signal processing and the physical radar/environment. Subsequently, specific research topics are suggested in which spectrum engineering and waveform diversity...
Video source identification is very important in validating video evidence, tracking down video piracy crimes and regulating individual video sources. With the prevalence of wireless communication, wireless video cameras continue to replace their wired counterparts in security / surveillance systems and tactical networks. However, wirelessly streamed videos usually suffer from blocking and blurring...
It is always desired to have high transmission rates over severe time-dispersive multi-path channels without usage of a complex receiver implementation. In this case the Multicarrier Code Division Multiple Access (MC-CDMA) is used which is a combination of conventional Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing (OFDM). Better BER performances are achieved by...
A crucial component of vehicular network security is to establish a secure wireless channel between any two vehicles. In this paper, we propose a scheme to allow two cars to extract a secret key from RSSI (Received Signal Strength Indicator) values in such a way that nearby cars cannot obtain the same secret. Our solution can be executed in noisy, outdoor vehicular environments. We also propose an...
We investigate the problem of image sensing under unfavorable photographic conditions in a wireless image sensor network. In the scenes with deflective and/or reflective medium such as fogs, mirrors, glasses, degraded images are captured by those image sensors. Such degraded images often lack perceptual vividness and they offer a poor visibility of the scene contents. Notably, computation-intensive...
The performance of an uplink radio signal on millimeter-wave-over-fiber using RF self-homodyned is numerically analyzed. The maximum wireless distance is derived considering the effects of fading in wireless channel and noise, distortion in radio-over-fiber link.
In this work, we study a special kind of primary user emulation (PUE) attack, named wireless microphone user emulation (WMUE) attack in white space cognitive radio networks. In WMUE attacks, a malicious user emulates wireless microphone (WM) signals in order to block secondary users. Existing work on WMUE attack detection deals with single channel senario. Although multi-channel WM (MCWM) systems...
This paper presents hovering control of an indoor micro helicopter only using single visual sensor feedback. The control technique is based on the parallel tracking and mapping (PTAM), a kind of visual simultaneous localization and mapping, using a small single wireless camera on the helicopter. The six degree of freedom of the helicopter is detected via the PTAM. The nonlinear dynamics of the helicopter...
A low cost ECG machine and research on ECG features with its implementation has been presented in this paper. The features presented can help in classifying the signals. This paper attempts to achieve the same functionality as a traditional ECG machine but based on three leads, hence reducing the size and cost as compared to a 12-lead ECG machine. The live data was obtained on the PC using a sound...
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