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A binaural algorithm to simultaneously detect the azimuth angle and the pitch of the sound source is proposed in this paper. This algorithm is extended from the stereausis model with two-dimensional coincidence detectors in the joint Space-Pitch domain. In our simulations, sounds from different locations are produced by passing through the Head-Related-Transfer-Function (HRTF). Simulation results...
We are presenting a progress in a construction and indoor tests of the photon counting detector for the European Laser Timing (ELT) experiment. ELT is an optical link prepared in the frame of the ESA mission "Atomic Clock Ensemble in Space" (ACES). The objective of this laser time transfer is the synchronization of the ground based clocks and the clock on board the space station with precision...
We propose a symbol-by-symbol (SBS) detector for Gaussian minimum shift keying (GMSK) signals in body area networks (BAN). Our detector exploits the orthogonality between adjacent GMSK-modulated symbols. By dividing the received signals into inphase-/quadrature-channels and odd-/even-streams, the strongest inter-symbol interference (ISI) from the adjacent symbols is removed. A whitened matched filter...
The distributed nature of the CSMA/CA based wireless protocols, e.g., the IEEE 802.11 distributed coordinated function (DCF), allows malicious nodes to deliberately manipulate their backoff parameters and thus unfairly gain a large share of the network throughput. The non-parametric cumulative sum (CUSUM) test is a promising method for real-time misbehavior detection due to its ability to quickly...
In this paper, a practical analog implementation of capacitor charge balance controller is presented, which is capable of achieving the optimal response for dc-dc Buck converters without relying on the knowledge of the nominal passive component (output inductor and capacitor) value. This ready-for-integration analog controller applies the output voltage curve analysis for deriving the formulas to...
Initial ranging (IR) involves detecting the binary phase shift keying (BPSK) code transmitted by the new subscriber station (SS). In this paper, we formulate a simple detector using the Neyman-Pearson theorem (NPT) for single-code detection in IEEE 802.16-compliant time division duplex (TDD) orthogonal frequency division multiple access (OFDMA) systems. Exploiting the BPSK structure in the ranging...
State-of-the-art digital fractional-N PLLs intended for modern wireless systems make use of high-resolution and high-linearity time-to-digital converters (TDCs) in order to meet the stringent integral phase noise requirements. Those high-performance TDCs complicate the synthesizer design and dissipate large part of the power budget, leading to poor jitter-power compromise. This paper introduces a...
This investigation presents a low power wake-up detector design to monitor wakening signals in a FlexRay-based car network. The detector is required to wake up the bus driver that is operated in the idle low power mode provided that a wakening signal appears. The proposed detector utilities two low-power comparators with hysteresis function to carry out the required wake-up function and state recognition...
Delay-insensitive asynchronous on-chip communication links are a key element to realize a highly reliable asynchronous Network-on-Chip system. However, even a single permanent fault, such as an interconnect fault, causes a deadlock state in the system. This paper presents an interconnect-fault-resilient delay-insensitive asynchronous communication link based on current-flow monitoring. Since current...
A time-localised iterative least square (TILS) based predictive zero-crossing detection (ZCD) algorithm for signals with slowly varying amplitudes and phases has been proposed in this paper. Useful for digital implementation, this technique predicts the zero crossing instant in advance so that further control decision based on ZCD could be performed without delay. The analytical formulation has been...
The purpose of this paper is to present a new peak-current injected digital control circuit for dc-dc converter and its dynamic characteristics. The proposed circuit is able to detect the peak point of the switch current in real time only by comparing two pulse trains. At the moment when the peak switch current is detected, the proposed circuit generates the turn off signal of the main switch. The...
With shrinking transistor sizes and supply voltages, errors in combinational logic due to radiation particle strikes are on the rise. A broad range of applications will soon require protection from this type of error, requiring an effective and inexpensive solution. Many previously proposed logic protection techniques rely on duplicate logic or latches, incurring high overheads. In this paper, we...
A compact polarization-diversity self-coherent receiver with reduced complexity is proposed. Requirements on input polarization tracking is relaxed by a variant CMA equalizer. Experiments are performed for 50 and 100 Gb/s PolMUX-NRZ-QPSK signals.
A linear self-referenced technique for temporal characterization of ultraweak pulse trains is presented. Shot-noise limited time-resolved single photon detection enables temporal resolution down to 10fs for pulse trains with ∼ 1 photon per pulse.
This paper introduces a power-aware behavioral modeling approach for analog components. A Verilog-A behavioral model, which considers the component's current consumption, is created using circuit information obtained from transistor-level simulation. Therefore, the model features high accuracy with the benefit of low computational effort. The concept can be applied to any analog component and enables...
Noncoherent receivers are the practical solutions for impulse radio (IR) ultra-wideband (UWB) systems due to their low-complexity and low-cost implementation. However, this simplicity is achieved at the expense of some performance degradation. In this paper, we propose the utilization of time reversal (TR) technique to improve the performance of a recently presented noncoherent detection scheme, called...
In a cognitive radio (CR) network, secondary users (SUs) are allowed to opportunistically access a licensed spectrum that is not currently being occupied by primary users. This paper is concerned with the problem of how to quickly and accurately locate an unoccupied channel or determine that there is no unoccupied channel, from multiple (yet finite) candidate channels for a SU with a single detector...
Spectrum sensing algorithms are developed for cognitive radios to support real-time traffic. Multiple bands are sensed in parallel to reduce sensing delay, while meeting a minimum rate requirement with a prescribed outage probability. Interference constraints are also imposed to protect primary user (PU) transmissions. Both fixed sample size (FSS) and sequential sensing algorithms are developed. In...
This paper describes a novel technique of phase detection using only non-sequential elements that can be used in clock and data recovery (CDR) circuits. CDR circuits typically employ a phase locked loop (PLL) or a delay locked loop (DLL) when a reference clock is available at exactly the same frequency of the transmitted data. CDR circuits using a PLL use either a linear phase detector or a non-linear...
An audio steganalysis technique to detect the existence of secret messages introduced by Echo Hiding (EH) is presented in this paper. After in-depth exploring the changing rule of the Sliding Window Cepstrum (SWC), we extract the sensitive statistical feature named Peak Location Aggregation Index (PLAI) in cepstrum domain to realize the echo detecting system. A rigorous mathematical derivation to...
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