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In this paper, a power system having different loads which are switched at different instants is considered. We consider scenarios when the loads in a power system change at very fast rate. This switching causes impulsive noise in the associated power line communication (PLC) channel which limits the average bit error rate (BER) performance. The paper aims to analyze the performance of a PLC system...
Multiple-input-multiple-output (MIMO) technique for visible light communications (VLC) facilitates higher data rate thanks to parallel data transmission. However, full channel-state information (CSI) is a requirement in a MIMO system at all times for successful data recovery, which is a major challenging factor in mobility and shadowing scenarios. In this paper we introduce a novel approach for a...
This paper analyses the communication performance for visible light communication (VLC) with Manchester encoded amplitude modulation. In particular, it considers the ripple generated by the LED driver as an important noise contribution for VLC. The ripple depends on the oscillation frequency of the converter which typically is chosen to satisfy other performance criteria such as power conversion efficiency...
Efficient digital transmission of continuous-amplitude signals requires source coding which comes at the price of unavoidable quantization errors. Thus, even in clear channel conditions, the quality of the decoded signal is limited due to these source coding errors (quantization). Hybrid Digital-Analog (HDA) codes circumvent this limitation by additionally transmitting the source coding error with...
We consider GNSS meaconing detection with multiple COTS receivers. Recently proposed detectors that use the receivers' reported positions are extended, to allow for the use of additional metrics, such as pseudo range. An actual meaconing attack is performed to evaluate the performance of the proposed detectors, using either position or pseudo range data. The attack is performed with a GPS simulator,...
The localization, that allows to precisely know the orientation and position of a system in the environment, is still challenging in urban environments due to satellite occlusion. This phenomenon reduces the data redundancy and provides bad satellite geometry and reflected signals, called multipaths, that distort the measurements and make them erroneous. The RAIM method, integrated in most GPS receivers,...
In this paper, a particle filtering algorithm is proposed for the challenging problem of multiple target tracking in ultra-wideband (UWB) radar sensor networks. The particle weights are derived analytically for the case of one transmitter and several receivers. The performance of the proposed particle algorithm is then evaluated through numerical results with comparison to the well-known Kalman filter...
A wideband CMOS receiver front-end for radio applications operating between 300 MHz and 900 MHz is presented. In order to obtain channel selection with image-rejection and out-of-band interferers attenuation, both low-noise amplifier (LNA) and mixer incorporate a N-Path signal processing technique. The effectiveness of this N-Path filtering is investigated by comparing distinct combinations of clock...
Conventional threshold-based method, such as nulling or clipping, is simple and effective for mitigation of impulsive noise (IN) in power-line commnucations (PLC) environment. However, we raise two issues for the threshold-based approach. First, for orthogonal frequency division modulation (OFDM) broadband PLC systems, the high peak-to-average power ratio (PAPR) characteristics of the received OFDM...
The first (single-bit) feed-forward (FF) FIR DAC continuous-time (CT)-ΔΣ ADC is presented for cellular radio applications. It provides a robust loop delay compensation with no performance degradation in the presence of radio out-of-band blockers; a known drawback of FF CT-ΔΣ ADCs. At 20/30/40 MHz operation, the FOM is less than or equal to 36 fJ/conv. At 10 MHz operation, the FOM is 50 fJ/conv. The...
Recently, it has been shown that the electromagnetic interference generated by computer platforms like laptops, smart phones, tablets, or PDAs fits a double-sided K-distribution statistic. This kind of impulsive noise can severely degrade the performance of linear receivers intended for operation under additive gaussian noise. Therefore, we propose the use of a quasi-optimal detection scheme with...
Electromagnetic spectrum scarcity is undoubtedly an issue nowadays given the demand for quality of service of wireless communication systems and its development. It makes necessary to use this resource efficiently. One possible solution is the spectrum sensing task in cognitive radio networks. This paper aims to analyze some cooperative eigenvalue-based spectrum sensing techniques under correlated...
A highly digital, low-power, forwarded clock transceiver is presented. It employs source shunt terminated transmit driver and all-digital delay line based I/Q generator based clock deskew suitable for fast wakeup, low-voltage operation. A quad-lane test chip fabricated in 22nm CMOS process operates between 3-to-8 Gbps over a FR4 channel with 12dB loss and achieves BER<10−12 while consuming 385-to-790fJ/b.
In this paper a highly-linear software defined radio front-end (LNA and Mixer) for wireless sensor networks in the 5.8-to-13 GHz frequency range is presented. It is suitable to IEEE 802.15.4a and IEEE 802.15.4a and upcoming different standards. The RF front-end features a very high robustness to out-of-band interference (OBI) thanks to mixer-based RF blocker filtering. This allows to remove any dedicated...
In this paper, we consider the bacterial point-to-point communication problem with one transmitter and one receiver by considering the ligand receptor binding process. The most commonly investigated signalling model, referred to as the Level Scenario (LS), uses one type of a molecule with different concentration levels for signaling. An alternative approach is to employ multiple types of molecules...
Optimal signaling is studied over a power-limited Gaussian channel with intermittent feedback, where a random mechanism—whose outcome is unknown to the receiver—determines whether or not the output symbol is fed back to the encoder. If the output symbols are fed back with probability smaller than one half, then even the two-messages error probability cannot decay faster than exponentially in the blocklength...
In-Band Full-Duplex (FDX) and MultiPacket Reception (MPR) are two transmission technologies that can be used together to improve the overall network capacity. However, the FDX Self-Interference Cancellation (SIC) techniques only filter part of the transmitted signal from the reception. This paper analyses how the FDX SIC residual noise influences the performance of MPR systems. It considers power...
We consider a channel model based on the diffusion of particles in the medium which is motivated by the natural communication mechanisms between biological cells based on exchange of molecules. In this model, the transmitter secretes particles into the medium via a particle dissemination rate. The concentration of particles at any point in the medium is a function of its distance from the transmitter...
Motivated by the ongoing discussion of spectrum scarcity, this paper considers the K-user cognitive interference channel with K − 1 primary/licensed users and one cognitive/secondary user who has non-causal knowledge of the messages of all primary users. This message sharing mechanism is referred to as cognitive-only message sharing. For certain parameter regimes, the sum-capacity of the symmetric...
While a multi-letter limiting expression of the capacity region of the two-user Gaussian interference channel is known, capacity is generally considered to be open as this is not computable. Other computable capacity outer bounds are known to be achievable to within 1/2 bit using Gaussian inputs and joint decoding in the simplified Han and Kobayashi (single-letter) achievable rate region. This work...
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