Adjacent channel suppression (ACS) in direct-digital six-port receivers

✍ Scribed by Yansheng Xu; Renato G. Bosisio

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 263 KB
• Volume: 30
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.1286

✦ Synopsis

Abstract

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.