Distributed radio communication base station system, base band unit, remote radio unit, and method for operating distributed radio communication base station system

A base band unit (BBU) of a distributed radio communication base station system, wherein the BBU comprises:

• a sampling frequency conversion section, wherein a sampling frequency of an optical signal is converted from a predetermined value to a reduced value RoF signal according to an allocated band of the radio signal, and transmitted through an optical fiber that connects the BBU and a remote radio unit (RRU);
• and
• a sampling frequency restoration section, wherein the sampling frequency is restored to the predetermined value when the reduced value RoF signal is received through the optical fiber and an aliasing noise generated in the restoration of the sampling frequency is removed.

A remote radio unit (RRU) of a distributed radio communication base station system, wherein the RRU comprises:

• a sampling frequency conversion section, wherein a sampling frequency of an optical signal is converted from a predetermined value to a reduced value RoF signal according to an allocated band of the radio signal, and transmitted through an optical fiber that connects the RRU and a base band unit (BBU);
• and
• a sampling frequency restoration section, wherein the sampling frequency is restored to the predetermined value when the reduced value RoF signal is received through the optical fiber and an aliasing noise generated in the restoration of the sampling frequency is removed.