Adaptive PTS approach for reduction of peak-to-average power ratio of OFDM signal

Author

Jayalath, A.D.S. ; Tellambura, C.

Author_Institution

Sch. of Comput. Sci. & Software Eng., Monash Univ., Clayton, Vic., Australia

Volume

36

Issue

14

fYear

2000

fDate

7/6/2000 12:00:00 AM

Firstpage

1226

Lastpage

1228

Abstract

An adaptive partial transmit sequence (PTS) technique is presented for the reduction of the peak-to-average power ratio (PAP) of an orthogonal frequency division multiplexing (OFDM) signal. The main problem for PTS is how to minimise the number of iterations necessary for locating the optimal weighting factors (which increases exponentially with the number of sub-blocks). In the proposed adaptive PTS approach, the iterations are stopped once the PAP drops below a preset threshold. For an OFDM system with 256 subcarriers and QPSK data symbols, adaptive PTS reduces the 0.1% PAP by 4 dB, while PTS (non-adaptive) reduces it by 4.1 dB. The complexity of adaptive PTS is just 2% of that of PTS

Keywords

OFDM modulation; adaptive signal processing; communication complexity; data communication; digital radio; quadrature phase shift keying; OFDM signal; QPSK data symbols; adaptive PTS approach; adaptive partial transmit sequence technique; complexity reduction; iterations; optimal weighting factors; orthogonal FDM signal; orthogonal frequency division multiplexing; peak-to-average power ratio reduction; preset threshold;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20000881

Filename

852257