A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS

Tomoyuki FURUICHI  Yang GUI  Mizuki MOTOYOSHI  Suguru KAMEDA  Takashi SHIBA  Noriharu SUEMATSU  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.10   pp.1078-1085
Publication Date: 2020/10/01
Publicized: 2020/03/27
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019CBP0008
Type of Manuscript: Special Section PAPER (Special Section on New Era of Satellite Communication/Broadcasting/Application Technologies)
high throughput satellite,  broadband,  direct RF,  undersampling,  receiver,  filter design,  

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In this paper, we propose a radio frequency (RF) anti-aliasing filter design method considering the effect of a roll-off characteristic on a noise figure (NF) in the direct RF undersampling receiver. The proposed method is useful for broadband reception that a system bandwidth (BW) has nearly half of the sampling frequency (1/2 fs). When the system BW is extended nearly 1/2 fs, the roll-off band is out of the desired Nyquist zone and it affects NF additionally. The proposed method offers a design target regarding the roll-off characteristic not only the rejection ratio. The target is helpful as a design guide to meet the allowed NF. We design the filter based on the proposed method and it is applied to the direct RF undersampling on-board receiver for Ka-band high throughput satellite (HTS). The measured NF value of the implemented receiver almost matched the designed value. Moreover, the receiver achieved the reception bandwidth which is 90% of 1/2 fs.