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A Baseband Digital Predistorter design is proposed in this paper for a UHF 8 MHz Power Amplifier (PA) for DVB-T transmitter. A Memory Polynomial (MP) model is considered for the PA characterization and its coefficients are estimated based on Least Square Estimation (LSE) algorithm. The Indirect Learning Architecture (ILA) approach is used to estimate the coefficients of the predistorter. Simulation...
This paper deals with Field Programmable Gate Array (FPGA) implementation design of a Predistorter real-time processing. The corresponding Baseband Digital Predistortion (DPD) is based on Memory Polynomial (MP) modelling of a UHF 8 MHz LDMOS Power Amplifier (PA). The PA MP model coefficients are estimated based on Least Square Estimation (LSE) algorithm. The proposed DPD design is using Look Up Table...
This paper focuses on the characterization and modelling of impulse noise in narrowband power line communication. Two modelling approaches of the measured noise are studied and compared: the memoryless Middleton class-A model and the Markov-Middleton model with memory. Model comparisons with measurements show that Markov-Middleton is compliant with the impulse noise temporal structure since it considers...
Fault-tolerant control, and fault detection and identification take into account, at the early design stage, unexpected system failures. For this reason, the ability of a sensor system to tolerate a fault must be taken from designing. This paper deals with the problem of fault tolerant sensor placement in wind turbine systems. A wind turbine sensor system analysis for fault tolerance capacity based...
This paper investigates adaptive Beamforming techniques used in concatenation with a ppSNR-based switching algorithm in multi-user MIMO OFDM systems. The performance's equivalence of SM adaptive beamforming and STBC adaptive one is shown analytically and by simulation, and a complexity study is carried out and allows selecting the beamforming adapted to SM. The effect of the MIMO architecture (with...
In this paper, we propose two methods to perform a switching between spatial multiplexing and MIMO diversity in order to improve performances of a 2×2 OFDM-MIMO system. Each method is defined depending on the granularity of the spatial processing. The comparison of BER performances of the two schemes leads to the choice of the sub-carrier based switching processing which gives the most significant...
This paper deals with the problem of fault tolerant actuator network design. Multi criteria based algorithm is proposed to provide a fault tolerant architecture. These criteria are strong redundancy degree and a new criterion based on the number of admissible losses situations. The new criterion, computed for each actuator, guarantees some robustness for operating safety. An oriented graph is used...
This paper proposes an advanced OFDM-MIMO reconfigurable architecture that uses an adaptive switching algorithm between diversity and spatial multiplexing. The transmitter blocs' specifications such as the MIMO technique and the modulation scheme are adjusted according to the channel state, which gives a practical cognitive radio strategy. The system cost- efficiency is performed by the application...
This paper presents a study of switching algorithm performances when combined to several beamforming techniques in a multi-user MIMO communication system. The study of three beamforming solutions shows that the beamforming processing has an important influence in the decision criterion of the switching algorithm. The STBC adaptive beamforming, which is better than Zero forcing (ZF) and Singular Value...
This paper presents an extra processing added to conventional LS estimation to improve its performances in OFDM-MIMO systems. The new technique is based on the knowledge of the power delay profile. The application of the improved estimator is useful when employing advanced MIMO adaptation techniques such switching algorithms and leads to significant improvement in decision criterion precision and...
Low amplitude impulsive noise measurements have been carried out in the time domain on a vehicle power line network. These measurements were made on a stationary vehicle and the motor idling. The characteristics of the measured low amplitude pulses were studied in terms of amplitude, frequency, duration and time interval between successive pulses. Stochastic models based on mathematical distribution...
This paper presents a technique for maintaining good broadband transmission quality in the face of impulsive noise in OFDM-PLC systems. The proposed technique is based on adding one zero between two signal samples in order to estimate the noise power in every transmitted signal sample. Simulation results of complete PLC system highlight good improvement in BER and correction ability performances for...
This paper presents a novel coding procedure to correct error bursts generated by impulsive noise corruption in broad-band PLC systems. The coding technique is based on a turbo code structure that uses RS coding and hard decision iterative decoding with erasure process in the decoder. The application of the new coding technique instead of simple RS in the HomePlug 1.0 FEC stage leads to significant...
This paper proposes an improved decoding technique to remove impulsive noise effects on broadband powerline communication systems. Presented contribution deals with Home Plug 1.0 OFDM-based PLC scheme in presence of impulsive noise modeled by a stochastic distribution approximation. In order to improve receiver BER regarding impulsive noise effect and to reduce the complexity processing, a decoding...
The object of this work is to investigate measurements and modelling of impulsive noise over in-house power lines. This paper presents details of impulsive noise characteristics determined from experiments. Statistical study helps to propose a noise model based on Markov theory. The comparison of the model, first to measures, and secondly to a previous validated model, prove the validation of the...
The data that is transmitted in PLC systems is subject to corruption by impulsive noise. Many techniques were proposed to correct its effect. In this paper, we propose the use of a modified erasure algorithm to shield PLC system from noise bursts. Apart its performance to correct burst errors, this algorithm presents the advantage of reducing the end- to-end delay of the system.
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