Evolium S.a.s.

Uwe Sulzberger

Keld Knut Lange

A radio base station has a baseband unit (BB) and multiple RF heads (RH, RH), which are interconnected by means of a bi-directional two-fiber optical ring (R). Each RF head (RH, RH) has a delay counter () for determining a propagation delay (tL) on the ring (R) and a variable delay circuit () for compensating a difference between the propagation delay on the ring and a predefined target delay (tRR). The delay counter counts () the delay between a test signal sent on the first fiber (F) of the ring to the baseband unit and a received test signal looped back by the baseband unit on the second fiber (F) of the ring.

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Stuttgart, Germany

Uwe Sulzberger