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A direct conversion receiver for satellite communication systems
Author(s) -
Huang Xinping
Publication year - 2005
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.810
Subject(s) - computer science , baseband , direct conversion receiver , radio receiver design , electronic engineering , quadrature (astronomy) , superheterodyne receiver , telecommunications , bandwidth (computing) , transmitter , channel (broadcasting) , radio frequency , detector , engineering
A direct receiver is an alternative to the well‐established super‐heterodyne receiver. It is especially attractive to highly integrated low‐cost terminals since it eliminates the need for components at intermediate frequencies. There is increasingly more interest in using it in various ground/space‐based systems. This article presents a new direct quadrature receiver that uses three channels with different phase shifts and a novel technique to derive the in‐phase and quadrature baseband signals independent of the actual gains and phases in the receiver chains. The new technique relies on the property that the in‐phase and quadrature signals are orthogonal, and its implementation involves the signal subspace decomposition and projection. Computer simulations and a 90 Mbps Ka‐band prototype receiver have demonstrated that the performance of the receiver closely matches the theory. Copyright © 2005 John Wiley & Sons, Ltd.