An Outphasing Scheme for Reducing Spectral Regrowth of Multi-Tone Signal in LINC Transmitter

Hyunchul KU
Youngcheol PARK

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B    No.2    pp.651-654
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.651
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
outphasing,  LINC,  path mismatch,  error vector magnitude,  spectral regrowth,  multi-tone,  

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Summary: 
This paper suggests an outphasing scheme to reduce adjacent channel spectral regrowth triggered by the gain and phase mismatch between two signal paths in linear amplification with nonlinear component (LINC) systems. The error vector magnitude and power spectral density of the output signal considering path mismatch are described analytically using path mismatch factor. An outphasing scheme is proposed to reduce the spectral regrowth. The proposed outphasing scheme reshapes the phases of the separated signals in LINC systems to reduce the changes of the phases. Its performance is verified by performing simulations with multi-tone signals. The result shows that the scheme can reduce the spectral regrowth of the multi-tone signals significantly compared to the conventional outphasing scheme for LINC systems with path imbalance.