TY  - JOUR
T1  - Adaptive Filter for a Memory HPA Distortion in OFDM Signals
AU - Shujaa, Mohamed I. AU - Falah Mohammed Hassan, Laith 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 15
SP  - 6225
EP  - 6231
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.6225.6231
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.6225.6231
KW  - Non-linear system identification
KW  -nonlinear amplifier
KW  -predistortion
KW  -HPA
KW  -OFDM
KW  -IBO
AB  - The Orthogonal Frequency Division Multiplexing (OFDM) technique is one of the recognized
technologies in the wireless communications because of its resistance to frequency selective fading channel.
The major element affecting nonlinearity is the High-Power Amplifier (HPA) when operated almost to a
saturation point. The memory HPA makes the OFDM signal to suffer from degradation in its performance. In
this study, the proposed Adaptive Filter Predistorter (AFP) and Simplicial Canonical Piecewise Linear (SCPWL)
digital predistorters are used to eliminate the side effects of the HPA. Signal to Noise Ratio (SNR) vs. Bit Error
Rate (BER) is taken as a normative of system performance. The results of the simulation present the strong
performance of the proposed method for eliminating the nonlinearity and the memory effects of the HPA over
SCPWL predistorter. The AFP has been provided a low BER under all situations. The SCPWL has been
produced a very high BER under a memory HPA and better BER under a memoryless HPA. The Input Back Off
(IBO) and Output Back Off (OBO) have been computed under memory HPA in three cases: without predistorter
with SCPWL and with proposed. The IBO has been equal to (0.3982), (0.2992) and (0.2074) and the OBO has
been equal to (0.1814), (0.1229) and (0.1252), respectively.
ER  -