IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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An anti-alias harmonic-reject phase modulation for digital outphasing transmitter
Yang WangLin-lin XieYong-sen WangYong HeiShu-shan Qiao
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2018 Volume 15 Issue 3 Pages 20171258

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Abstract

This paper proposes a sufficient anti-alias and harmonic-reject phase modulation (PM) technique for digital outphasing transmitter. Instead of using complicated spectrum shaping modulation or power-hungry digital-to-analog (DAC) and high-order filters, the proposed less-complex modulation employs cross point estimation (CPE) algorithm to improve the adjacent channel leakage ratio (ACLR) performance and adopts harmonic rejection algorithm to achieve out-of-band (OOB) noise attenuation. When evaluated with a 10 dB peak-to-average power ratio (PAPR) 16 QAM orthogonal-frequency-division-multiplexing (OFDM) signal with a 30 MHz intermediate frequency (IF) carrier, the proposed modulation achieves an ACLR of −65 dBc, providing 17 dB improvement compared with −48 dBc for conventional modulation. Moreover, 56 dB and 57 dB extra attenuations for the 2rd and 3rd images are achieved, respectively.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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