Combined coding and companding to reduce both PAPR and BER in OFDM systems
A major problem in telecommunications is to adapt the
information to transmit to the propagation channel. For frequency
selective channels, a technique is to use multi-carrier modulation
such as OFDM (Orthogonal Frequency Division Multiplexing) in
which an information block is modulated by a Fourier transform.
But one of the main disadvantages of OFDM is its high PAPR
(Peak to Average Power Ratio).
In this paper we propose a method for reducing PAPR using
encoding and companding techniques. Companding is used to
reduce PAPR while coding is used to reduce the Bit Error Rate
(BER). BCH codes and #956;-law compander have been used for this
purpose. The effects of modulation have been studied too.
Keywords: block coding, BCH, OFDM, PAPR, Companding
Download Full-Text
ABOUT THE AUTHORS
Hervé Koudougnon
H. Koudougnon received his license in Computer Science and Engineering in Jun 2001 and Master in Computer Science and telecommunication from University of Mohammed V - Agdal, Rabat, Morocco in 2006. Currently he is doing his PhD in Computer Science and Engineering at ENSIAS (Ecole National d’Informatique et Anlyse des Systmes), Rabat, Morocco. Herareas of interest are Signal Processing and Information Theory
Idriss Chana
I. Chana received his license in Computer Science and Engineering in Jun 2001 and Master in Computer Science and telecommunication from University of Mohammed V - Agdal, Rabat, Morocco in 2006. Currently he is doing his PhD in Computer Science and Engineering at ENSIAS (Ecole National d’Informatique et Anlyse des Systmes), Rabat, Morocco. Herareas of interest are Information and Coding Theory.
Mostafa Belkasmi
M. Belkasmi is recently a professor at ENSIAS (Ecole National d’Informatique et Anlyse des Systme), head of Telecom and Embedded Systems Team at SIME Lab .He had PhD at Toulouz University in 1991. His current research interests include mobile and wireless communications, 3G and 4G networks, and Information and Coding Theory.
Hervé Koudougnon
H. Koudougnon received his license in Computer Science and Engineering in Jun 2001 and Master in Computer Science and telecommunication from University of Mohammed V - Agdal, Rabat, Morocco in 2006. Currently he is doing his PhD in Computer Science and Engineering at ENSIAS (Ecole National d’Informatique et Anlyse des Systmes), Rabat, Morocco. Herareas of interest are Signal Processing and Information Theory
Idriss Chana
I. Chana received his license in Computer Science and Engineering in Jun 2001 and Master in Computer Science and telecommunication from University of Mohammed V - Agdal, Rabat, Morocco in 2006. Currently he is doing his PhD in Computer Science and Engineering at ENSIAS (Ecole National d’Informatique et Anlyse des Systmes), Rabat, Morocco. Herareas of interest are Information and Coding Theory.
Mostafa Belkasmi
M. Belkasmi is recently a professor at ENSIAS (Ecole National d’Informatique et Anlyse des Systme), head of Telecom and Embedded Systems Team at SIME Lab .He had PhD at Toulouz University in 1991. His current research interests include mobile and wireless communications, 3G and 4G networks, and Information and Coding Theory.