Paper Info
Title
Mac Controlled Linc Calibration Using Pilot-Aided Lse Channel Estimator For Ofdm Systems
Abstract
With the overwhelming adoption of Orthogonal Frequency Division Multiplexing (OFDM) technique in many recent wireless communications standards, there have been extensive approaches to tackle the high Peak-to-Average Power Ratio (PAPR) problem that yields low efficiency in RF power amplifiers, which is the major drawback of OFDM systems. One of the approaches is to replace power amplifiers with the Linear Amplification using Nonlinear Components (LINC) block. However, this produces additional nonlinear distortions caused by amplitude or phase mismatch between two power amplifiers inside the LINC block. In this paper, we introduce a noble LINC calibration technique that utilizes the channel estimator block that is initiated by the Media Access Control (MAC) layer during the Distributed Interframe Space (DIFS) or Short Interframe Space (SIFS). For DIFS or SIFS, pilot symbols are allocated in a payload field and then the outputs of the transmitter are internally forwarded to the receiver to characterize the LINC channel with a pilot-aided Least Square Error (LSE) channel estimator. By applying a reverse distortion onto information symbols after the LINC channel distortion is obtained by channel estimation, we can significantly improve the Symbol Error Rate (SER) and Error Vector Magnitude (EVM) of the OFDM system with the LINC transmitter.
Year
DOI
Venue
2009
10.1109/VETECS.2009.5073661
2009 IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5
Keywords
Field
DocType
Orthogonal Frequency Division Multiplexing (OFDM), Linear Amplification using Nonlinear Components (LINC), Peak-to-Average Power (PAPR), Calibration, Channel Estimation, Least Square Error (LSE), Media Access Control (MAC) layer, Distributed Interframe Space (DIFS), Short Interframe Space (SIFS)
Transmitter,Computer science,Communication channel,Electronic engineering,Phase distortion,Short Interframe Space,RF power amplifier,Nonlinear distortion,Distortion,Orthogonal frequency-division multiplexing
Conference
ISSN
Citations 
PageRank 
1550-2252
0
0.34
References 
Authors
4
5
Name
Order
Citations
PageRank
Sangwook Suh141.14
Kwan-woo Kim28710.47
Joonhoi Hur3557.62
Kyutae Lim418530.31
Joy Laskar518431.26