An anti-alias harmonic-reject phase modulation for digital outphasing transmitter

: This paper proposes a su ffi cient 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 fi lters, 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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