The baseband unit (BBU) is the baseband processing unit of telecom systems. The BBU has the advantage of modular design, small size, high integration, low power consumption and easy deployment. A typical wireless base station consists of the baseband processing unit (BBU) and the RF processing unit (remote radio unit - RRU). The BBU is placed in the equipment room and connected with the RRU via optical fiber. The BBU is responsible for communication through the physical interface.

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Wireless Base Station - Baseband Unit (BBU) Block Diagram