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The system is based on the platform of Altera DE2 SOPC and RS232 interface using a wireless channel environment. NIOS_II processor and FPGA hardware co-design methodology is adopted. The soft-core processor asks for a request to send codec allocation and other operations and FPGA is responsible for the major hardware codec. The LDPC codec system can achieve a two-way communication with flexible configuration, which is particularly suitable for satellite communications.