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An in-vivo body network is an interconnection of implanted medical devices without a wired or wireless connection. In this paradigm, the body's own circulatory network is utilized as the channel. Instead of electrical or electromagnetic signals, inert nano particles are used as the signal carrier. A framework for in-vivo communication along with a computer based model is developed. Simulation results...
In this paper, we describe a novel design of a Peak-to-Average-Power-Ratio (PAPR) reducing system, which exploits the relative temporal sparsity of Orthogonal Frequency Division Multiplexed (OFDM) signals to detect the positions and amplitudes of clipped peaks, by partial observation of their frequency content at the receiver. This approach uses recent advances in reconstruction of sparse signals...
The paper presents the design, implementation of the a unique type of computer controlled wireless mobile surveillance robot equipped with intelligence. Building an experimental autonomous mobile wireless vehicle, which has the ability to perform in real time environments is both a technical and scientific challenge and demands the development of systems for perception, modeling, planning and navigation...
In this paper, a novel hardware design along with software design for developing an efficient radio communication system w.r.t. a mobile robotic system is presented. The developed hardware & software to control the mobile robotic system using an efficient communication link shows the effectiveness of the developed method.
This paper focuses on a simple beamforming problem and compares the MIMO and SIMO radar systems for the case where the transmitter and receiver are collocated. The simplicity of the application allows one to see clearly where the advantages of MIMO radar come from, and what the tradeoffs are. The comparison also includes a third system called the IFIR radar (interpolated FIR radar). The MIMO radar...
Bistatic SAR uses separated transmitter and receiver flying on different platforms, and has the ability of the exploitation of additional information contained in the bistatic reflectivity of targets. This paper provides an efficient Nonlinear-Chirp Scaling (NLCS) algorithm for arbitrary bistatic SAR configure, which is based on the bistatic-to-monostatic application (BTMA). The method described is...
Communication systems must maintain tight timing synchronization between the transmitter and receiver. Systems typically pull-in timing from a large timing offset and then track timing once it has been sufficiently pulled in. When timing errors are large, additional reference symbols are needed to pull-in time. In some frequency hopping systems, the time pull-in step must be repeated for every hop...
This paper presents a method for searching the exact rays between a Transmitter and a Receiver when a ray interacts with a material inside which multiple reflections can occur. Indeed, when considering building materials with a certain thickness, the ray-tracing algorithms often consider that the transmitted rays are not deflected, and the reflected rays are only subject to specular reflection. Therefore,...
This paper deals with the network spectral efficiency/capacity analysis of multiple-input multiple-output (MIMO) ad hoc network with K simultaneous communicating transceiver pairs in two scenarios; quantized beamforming for achieving finite rate feedback and imperfect channel state information at the transmitter (CSIT). In the quantized beam forming, each receiver chooses the best beamforming vector...
In this paper, we consider the problem of functional compression for an arbitrary tree network. Suppose we have k possibly correlated source processes in a tree network, and a receiver in its root wishes to compute a deterministic function of these processes. Other nodes of this tree (called intermediate nodes) are allowed to perform some computations to satisfy the node's demand. Our objective is...
We introduce Advanced T-DMB system based on hierarchical modulation to increase data rate. As the requests for the mobile broadcasting services grow rapidly and become diverse, the technology competition among mobile broadcasting systems also becomes intense. For this, we developed the Advanced T-DMB system to satisfy various requests of viewers' by increasing data rate of T-DMB maximally in double...
We have developed a remote measurement and control system based on GPRS for multi-frequency IP instrument to resolve the problem that the receiver cannot control the transmitter and controller remotely in electrical exploration. The system is composed of communication module, host apparatus and slave apparatus. Communication module contains three DTUs inserted with three SIM cards, respectively, which...
A novel real-time monitoring method using the oblique incidence sonar is proposed to realize the in situ measurement of water depth in harbour channel. Making use of the multipath propagation structure of underwater acoustic channel, the method obtains the depth values by calculating the relative time delay of acoustic signals between the direct and the shortest bottom reflected paths. Bistatic transducer...
Measurements in two different mature forests have been performed, considering a pine forest and a eucalyptus forest. The peer-to-peer scenario used responds to the current needing of radio data for network planning: there exist much information about propagation in vegetation in base station to mobile terminal (master-slave) configurations, but there is a lack in peer-to-peer configurations. The current...
The two-curve MIMO performance model provides network planners with an intuitive model for MIMO system performance that not only incorporates the site-specific effects of multipath correlation, but also improves prediction accuracy compared to a single-curve lookup table. Most notably, the 2CMPM improved the standard deviation of the prediction by 8 Mbps in the 5.2 GHz band. Further, analysis of the...
We fabricated a multiband transceiver for mobile WiMAX in 90-nm CMOS technology. It operates at three RF bands (2.3/2.5/3.5 GHz) with a large dynamic range. We adopted a double conversion receiver that can switch lower and upper local modes. An image rejection ratio (IRR) tunable single side-band (SSB) mixer was used to achieve over 50 dB IRR. The RCE for 2.5 GHz at -71.5 dBm input was -28.7 dB and...
In this paper we present a quad-band single-chip GSM/GPRS radio in 90 nm digital CMOS process based on the digital RF Processor (DRPtrade) technology. This chip integrates all functions from physical layer to the protocol stack and peripheral support in a single chip RF SoC. The transmitter uses a low-area small-signal digital polar architecture merging amplitude and phase information directly in...
Migrating solutions to the most advance CMOS process node addresses cost reduction but increases RF interference within a SoC. In this paper we address the issue of design verification of single-chip RF SOCs in the presence of unintentional cross-couplings and leakages due to proximity of aggressors and victims. We will extend a previously presented VHDL based simulation methodology that accepts RF...
This paper considers spectrally efficient anti-jamming system design based on message-driven frequency hopping (MDFH). We first analyze the performance of the MDFH system under different jamming scenarios. It is observed that MDFH is particularly robust under strong jamming. However, it experiences a performance bottleneck under disguised jamming, for which the jamming power is close to the signal...
In many network communication scenarios, a relay in the network may only need to recover and retransmit an equation of the transmitted messages. In previous work, it has been shown that if each transmitter employs the same lattice code, the interference structure of the channel can be exploited to recover an equation much more efficiently than possible with standard multiple-access strategies. Here,...
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