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Your search keyword '"Rouabah, Khaled"' showing total 33 results
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33 results on '"Rouabah, Khaled"'

20. Spreading codes performances comparison in terms of Bit-Error-Rate in additive white Gaussian noise channel

Author

Mlle. Boukerma Sabrina, Rouabah Khaled, Chikouche Djamel, and Atia Salim

Subjects
Block code, Concatenated error correction code, Data_CODINGANDINFORMATIONTHEORY, Serial concatenated convolutional codes, Luby transform code, Linear code, Computer Science::Performance, Turbo code, Electronic engineering, Low-density parity-check code, Hamming code, Algorithm, Computer Science::Information Theory, Mathematics
Abstract

In this paper, we present the performances comparison, in terms of Bit Error Rate (BER), of different spreading codes largely used in Direct Sequence Code Division Multiple Access system DS-CDMA. Different tests were performed on AWGN Channel with BPSK modulation. In fact, orthogonal and Pseudo Noise (PN) codes were tested using synchronous communication model. Their performances were compared based on the code length and number of users. It has been found that the performances of the orthogonal codes are much better than PN codes. However, among all orthogonal sequences, Walsh-Hadamard sequence has the best performances in terms of BER. For PN codes, large set of Kasami has poor performances.

Published
2015

25. GNSS Signals Acquisition and Tracking in Unfavorable Environment.

Author

CHEBIR, Saifeddine, AIDEL, Salih, ROUABAH, Khaled, ATIA, Salim, and FLISSI, Mustapha

Subjects
GLOBAL Positioning System, SIGNAL processing, MULTIPATH channels, GALILEO satellite navigation system, COMPUTER simulation
Abstract

In this paper, we propose a method based on applying specific transformations to the Global Navigation Satellite System (GNSS) signals received in unfavorable environment. As a result, one simple classical receiver including these adjustments becomes sensitive to several Multi-Constellation and Multi-Frequency (MC/MF) GNSS signals and achieves efficiently their collective acquisition. The proposed method consists of three variants each dedicated to a particular type of Binary Offset Carrier (BOC) family signals; the primary is based on undersampling process, the second is founded on time expansion and the last one permits the acquisition of more than five different GNSS signals by a single local Composite Binaiy Coded Symbols (CBCS) waveform replica. Hence, the proposed scheme, by avoiding the use of multiple demodulators in the baseband, allows less receiver complexity and accordingly better realization cost. The simulation results showed that the proposed method presents an effective solution for the reception of MC/MF signals in unfavorable environments. [ABSTRACT FROM AUTHOR]

Published
2018
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