Exponential companding technique for PAPR reduction in OFDM systems

In this paper, a new nonlinear companding technique, called "exponential companding", is proposed to reduce the high Peak-to-Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) signals. Unlike the /spl mu/-law companding scheme, which enlarges only small signals...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on broadcasting 2005-06, Vol.51 (2), p.244-248
Main Authors: Jiang, T., Yang, Y., Song, Y.-H.
Format: Article
Language:English
Subjects:
Additive white noise
Applied sciences
AWGN
Baseband
Bit error rate
Channels
Companding
Computer simulation
Exact sciences and technology
Expansion
Format
Modulation
Non-linear companding transform
OFDM
Orthogonal Frequency Division Multiplexing
Orthogonal Frequency Division Multiplexing (OFDM)
Peak to average power ratio
Peak-to-Average Power Ratio (PAPR)
Phase error
Power amplifiers
Reduction
Solid state circuits
Solid State Power Amplifier (SSPA)
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, a new nonlinear companding technique, called "exponential companding", is proposed to reduce the high Peak-to-Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) signals. Unlike the /spl mu/-law companding scheme, which enlarges only small signals so that increases the average power, the schemes based on exponential companding technique adjust both large and small signals and can keep the average power at the same level. By transforming the original OFDM signals into uniformly distributed signals (with a specific degree), the exponential companding schemes can effectively reduce PAPR for different modulation formats and sub-carrier sizes. Moreover, many PAPR reduction schemes, such as /spl mu/-law companding scheme, cause spectrum side-lobes generation, but the exponential companding schemes cause less spectrum side-lobes. Computer simulations, which consider a baseband OFDM system with Additive White Gaussian Noise (AWGN) channels and a Solid State Power Amplifier (SSPA), show that the proposed exponential companding schemes can offer better PAPR reduction, Bit Error Rate (BER), and phase error performance than the /spl mu/-law companding scheme.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2005.847626