Title :
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
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;
Conference_Titel :
Microwave Measurement Conference (ARFTG), 2014 83rd ARFTG
Conference_Location :
Tampa, FL
DOI :
10.1109/ARFTG.2014.6899505
