A radio communication system comprising: a transmitter includes a plurality of sectors and a first and second communication unit (150-1,150-2) in each of the sectors; and a receiver, wherein the first communication unit includes: a control information generation unit configured to transmit information for generating a common scrambling code by the first and second communication units, to the second communication unit, the first and second communication units include: a process unit configured to perform a scrambling process to a transmission data by using the common scrambling code respectively, when the transmission data in each of sectors is transmitted to the receiver respectively; and a transmission unit configured to transmit the scrambled transmission data to the receiver respectively, and the receiver includes: a reception unit configured to receive the scrambled transmission data and perform descrambling process to the scrambled transmission data by using the common scrambling code. a transmitter includes a plurality of sectors and a first and second communication unit (150-1,150-2) in each of the sectors; and a receiver, wherein the first communication unit includes: a control information generation unit configured to transmit information for generating a common scrambling code by the first and second communication units, to the second communication unit, the first and second communication units include: a process unit configured to perform a scrambling process to a transmission data by using the common scrambling code respectively, when the transmission data in each of sectors is transmitted to the receiver respectively; and a transmission unit configured to transmit the scrambled transmission data to the receiver respectively, and the receiver includes: a reception unit configured to receive the scrambled transmission data and perform descrambling process to the scrambled transmission data by using the common scrambling code. a control information generation unit configured to transmit information for generating a common scrambling code by the first and second communication units, to the second communication unit, the first and second communication units include: a process unit configured to perform a scrambling process to a transmission data by using the common scrambling code respectively, when the transmission data in each of sectors is transmitted to the receiver respectively; and a transmission unit configured to transmit the scrambled transmission data to the receiver respectively, and the receiver includes: a reception unit configured to receive the scrambled transmission data and perform descrambling process to the scrambled transmission data by using the common scrambling code. a process unit configured to perform a scrambling process to a transmission data by using the common scrambling code respectively, when the transmission data in each of sectors is transmitted to the receiver respectively; and a transmission unit configured to transmit the scrambled transmission data to the receiver respectively, and the receiver includes: a reception unit configured to receive the scrambled transmission data and perform descrambling process to the scrambled transmission data by using the common scrambling code. a reception unit configured to receive the scrambled transmission data and perform descrambling process to the scrambled transmission data by using the common scrambling code.