AM/AM AM/PM estimation on IEEE 802.11a packet with OFDM demodulator

Author

Hsu, Oliver ; Jian, Hengyi

Author_Institution

Broadcom Corp., San Diego, CA, USA

fYear

2014

fDate

6-6 June 2014

Firstpage

1

Lastpage

4

Abstract

Nowadays, accurately characterizing linearity of power amplifier (PA) becomes difficult in system-on-chip (SoCs) solutions because the PA input is not accessible. This paper introduces a methodology to characterize AM-AM/AM-PM distortion on 802.11a OFDM packets without knowing input signals or synchronizing device under test (DUT) Xtal to reference clock of equipment. Reference samples for AM-AM/AM-PM calculation are derived from captured samples with channel response added for cancellation. Frequency and timing offset are compensated on captured samples. Measured AM-AM/AM-PM results are correlated to EVM of the DUT.

Keywords

OFDM modulation; amplitude modulation; demodulators; distortion; phase modulation; power amplifiers; system-on-chip; telecommunication standards; wireless LAN; AM-AM distortion; AM-PM distortion; IEEE 802.11a packet; OFDM demodulator; SoC; channel response; frequency offset; power amplifier; system-on-chip; timing offset; Baseband; Clocks; Demodulation; Distortion measurement; OFDM; System-on-chip; Time-domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Measurement Conference (ARFTG), 2014 83rd ARFTG

Conference_Location

Tampa, FL

Type

conf

DOI

10.1109/ARFTG.2014.6899505

Filename

6899505