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This paper proposes an effective method, based on the concept of phase cancellation and filtering, to suppress interference containing multiple linear frequency modulated (LFM) sinusoidal components for direct sequence spread spectrum (DSSS) communications. Since the recently reported Lv distribution (LVD) provides a better concentration of signal energy in the domain of frequency and chirp rate,...
Many anti-jamming techniques have been proposed such as adaptive temporal filtering (ATF), spatial adaptive processing (SAP), space-time adaptive processing (STAP), power spectrum excision, and etc. The performance of each specific anti-jamming technique is often evaluated in terms of tracking thresholds not in terms of range or position error. And several techniques can be combined together to provide...
A new direction of arrival(DOA) estimator in the presence of interference is presented in this paper. To suppress interference, the oblique projection is constructed with the prior knowledge of interference sources, which is used to filter undesired signals out. After filtering, DOAs of signals are estimated by the improved L1-SVD algorithm, in which the noise power is estimated to solve the optimization...
A robust constrained set-membership (SM) affine-projection adaptive-filtering algorithm is proposed that works with two error bounds. One of the error bounds works during transience and the other works during steady state and in this way a faster convergence and significantly reduced steady-state misalignment can be achieved relative to what can be achieved with the constrained normalized least mean-squares...
We propose a novel rank-selection criterion for the Krylov-subspace-based filtering techniques such as the well-known multistage Wiener filter. We provide two necessary and sufficient conditions for the low-dimensional Krylov subspace to contain the optimal filter. The first condition is that the subspace is invariant under the transformation by the autocorrelation matrix associated with the subspace...
The basic issue of our solution is a noise generated by the transformer operation. If we ignore the constructional intervention to the transformers, we can proceed to the problem with active and passive solution. The passive solution can be covers, rubber silent blocks and elimination due to construction of the building. Our proposed solution for this problem is on active base by sending an identical...
Low voltage power lines are attractive for communications in smart metering, but they are subject to many kinds of interferences. One important source of interference is the one which is synchronous with the power network frequency. This noise shares the mean periodicity with the mains, but it also usually has some sort of time drift or jitter that shifts the position and phase of the signal from...
This paper introduced the technical requirements and the realization method of multi-channel data acquisition circuit, proposed some solutions to eliminate channel crosstalk. The design can finish to sampling 32 channel analog signals and convert them based FPGA as a core-logic controller, this device has been successfully applied in a comprehensive telemetry device.
In this paper, we propose to apply power control to self-encoded spread spectrum (SESS) in multirate and multimedia applications. The transmitter employs power control to to combat dynamic channel fading and the receiver employs decorrelation to reduce interference from multiple applications. We show that iterative detection can significantly improve the system performance. The proposed approach also...
Ultra Wide Band (UWB) is foreseen to support a physical layer in Body Area Networks (BAN). The nature of the channel leads to the spread of the signal energy through the numerous paths from the reflexions in the environment. With such a multipath channel, inter-pulses interference (IPI) may occur if the channel delay spread is longer than the interval between two consecutive pulses. An energy detector...
This paper discusses EMI filter design methodology for DC-fed three-phase motor drive system. An analysis of noise source and propagation path impedances of motor drive systems is conducted, a new filter design model for both AC side and DC side filter is proposed based on the impedance mismatching between the EMI filter impedances and noise source/load impedances. Using this model, the in circuit...
This paper characterized the CM noise generation and coupling mechanism to predict the CM noise in Flyback converter. The spectrum of noise sources are analyzed using bandwidth-effects-FFT and the CM noise coupling paths are identified to build up a new CM noise analysis method. With this CM noise analysis method, the total CM noise and the contributions of all the coupling paths in the converter...
Wake-up radio technology is a means to improve energy efficiency in low-power wireless sensor networks. In such radios, low-power low-complexity designs are considered, often based on narrow-band transmission, simple modulation techniques, noncoherent detection and matched filter receivers. In order to improve the performance of wake-up radios in interference limited scenarios, while keeping the power...
This paper considers the problem of uplink scheduling in wireless networks supporting successive interference cancellation (SIC) at the physical layer. By allowing concurrent interfering transmissions, SIC enables multi-packet reception at the receiver resulting in increased network throughput. Specifically, we consider maximum throughput scheduling and proportional fair scheduling problems and study...
Many wireless sensor network datasets suffer from the effects of acquisition noise, channel noise, fading, and fusion of different nodes with huge amounts of data. At the fusion center, where decisions relevant to these data are taken, any deviation from real values could affect the decisions made. We have developed computationally low power, low bandwidth, and low cost filters that will remove the...
A new adaptive signal-preserving technique for noise suppression in gene expression data is proposed based on spectral subtraction. The proposed technique estimates a parametric model for the power spectrum of random noise from the acquired data based on the characteristics of the Rician statistical model. The new technique is tested using computer simulations from DREAM3 competition dataset. The...
The law of the time to transmit a packet from a node to its intended receiver, in a wireless network with randomly deployed, multiple-antennas equipped nodes, whose communication is impaired by fading and interference, is investigated. SINR-based coverage at the physical layer is assumed, and the useful signal strength is shaped through either cooperative or non-cooperative beamforming. In particular,...
We consider the role of independent single antenna relays in allowing for interference cancellation and for multiplexing of uplink and downlink communications, in the presence of multiple interfering users. For a specific practical scenario of interest, we construct interference neutralization schemes that are simple, distributed and which encode over both space and time, to achieve performance improvements...
Multiple access interference is the major limiting factor for the channel capacity especially when it is desired to have an overloaded code division multiple access system, in which the number of users is larger than the dimension of signal space. To resolve the problem of overloading we exploit the multicarrier communication and a proposed scheme, which uses pseudo-user along with parallel interference...
A wide band Low Noise Amplifier (LNA) in 0.18 μm CMOS technology, employing noise cancellation and current reuse, which receives different wireless standards over a frequency range of 900 MHz to 6 GHz, is designed, analyzed and simulated. The LNA provides a power gain of 17.5 dB with a power dissipation of 13.7 mW, and a noise figure (NF) of 2.6 to 3.5 dB over a bandwidth of 0.9 GHz to 6 GHz.
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