60-GHz Self-Heterodyne Through-Repeater Systems with Suppressed Third-Order Intermodulation Distortions

Chang-Soon CHOI
Hiroki OHTA

IEICE TRANSACTIONS on Electronics   Vol.E93-C    No.1    pp.94-100
Publication Date: 2010/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.94
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
millimeter-wave,  wireless repeater,  digital broadcasting,  self-heterodyne,  intermodulation distortion,  

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We present a 60-GHz wireless through-repeater system based on self-heterodyne transmission scheme with the potential to optimize the carrier-to-interference and noise ratio (CINR) performance according to the transmission distance. The phase-noise degradation through a 60-GHz repeater link is not a serious concern when we employ the self-heterodyne transmission scheme. Multichannel interferences caused by third-order intermodulation distortions are efficiently suppressed by setting a high power ratio of LO carrier to RF signals in the self-heterodyne transmission. However, this high power ratio results in a lower carrier-to-noise ratio (CNR) and becomes unsuitable for improving link performance if the transmission distance increases. In order to facilitate a solution, we propose and make an embodiment of 60 GHz self-heterodyne transmitters that provide flexible control over the power ratio of LO to RF in a range of 10 dB ranges. With them, we successfully demonstrate terrestrial digital broadcasting signals on five channels and optimize their performance for wireless through-repeater applications.