ANTENNA SYNCHRONIZATION FOR COHERENT NETWORK MIMO

摘要

The invention relates to a method for synchronizing RF antenna signals (5a to 5i) of a plurality of RF antenna sites (3a to 3i) arranged at different locations of a radio transmission system (1b), the method comprising; generating a reference signal (7) in a reference oscillator (6) located at a central unit (2) of the radio transmission system (1b), transmitting the reference signal (7) as an optical signal from the central unit (2) to the RF antenna sites (3a to 3i) via a plurality of optical fiber links (9a" to 9i"), and using the transmitted reference signal (7) for synchronizing the RF antenna signals (5a to 5i) of the different RF antenna sites (3a to 3i), The invention also relates to a radio transmission system (1b).