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Adjacent channel suppression (ACS) in direct‐digital six‐port receivers
Author(s) -
Xu Yansheng,
Bosisio Renato G.
Publication year - 2001
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.1286
Subject(s) - port (circuit theory) , channel (broadcasting) , microwave , electrical engineering , qam , engineering , physics , electronic engineering , topology (electrical circuits) , telecommunications , quadrature amplitude modulation , bit error rate
System simulation results of a digital six‐port receiver operating with an ideal six‐port (120° between Q i points), over two adjacent channels, are compared with a second six‐port receiver operating with a special six‐port circuit possessing 120° separation between Q i points in the receiving channel and 0° separation between Q i points in the adjacent channel. Theoretical analysis and simulation results are given on adjacent channel suppression using 64‐QAM modulation. The implementation of special six‐port ACS requires a six‐port wave structure with constant phase velocity in the receiving channel and reduced phase velocity in the adjacent channel to decrease the angles of the two adjacent Q i points of the six‐port by 120°. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 265–270, 2001.
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