Influence of PAPR on Link Adaptation Algorithms in OFDM Systems

Author

Das, Suvra Sekhar ; Rahman, Muhhamad Imadur ; Pongsuwanich, Nidcha ; Wang, Yuanye ; Mahmood, Nurul Huda ; Flores, Carlos Leonel ; Jati, Bayu Anggoro ; Prasad, Ramjee

Author_Institution

Center for TeleInFrastruktur, Aalborg Univ.

fYear

2007

fDate

22-25 April 2007

Firstpage

1961

Lastpage

1965

Abstract

The impact of high power amplifier (HPA) on the performance of orthogonal frequency division multiplexing (OFDM) based wireless systems using link adaptation (LA) is analyzed in this work. LA maximizes throughput while maintaining a target bit error rate (BER) at the receiver. The non linear behaviour of the HPA introduces distortion in the OFDM signal which has high peak to average power ratio (PAPR). It is found in this work that this causes LA schemes to fail to meet the target BER. It is shown in this work that to make the LA system satisfy the BER constraint, the signal to noise ratio thresholds for changing the adaptive modulation needs to be updated.

Keywords

OFDM modulation; adaptive modulation; error statistics; power amplifiers; radio links; OFDM systems; PAPR; adaptive modulation; bit error rate; high power amplifier; link adaptation algorithms; orthogonal frequency division multiplexing; peak to average power ratio; wireless systems; Algorithm design and analysis; Bit error rate; Distortion; OFDM modulation; Peak to average power ratio; Performance analysis; Power amplifiers; Power distribution; Signal to noise ratio; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th

Conference_Location

Dublin

ISSN

1550-2252

Print_ISBN

1-4244-0266-2

Type

conf

DOI

10.1109/VETECS.2007.406

Filename

4212834