Carrier Synchronization of ICS-554 Software Radio Platform
Maoyin Chen · Ordnance Industry Automation · 2006
Implement carrier synchronization module in DSP based on ICS-554 was realized by adopting the cross-Product Automatically Frequency Tracking (CPAFT) algorithm and SPLL. The SPLL consists of calculation frequency error, updating loop middle variable, and output control signal. The two A/D sampling channel was used to send the original signal into ICS-554 output at the same time. The delay filter was added in A/D module of Channel 2. The corresponding signal passed mixer, bus transmission, the SPLL calculation and the frequency of fest control bus to transmit time. So, the frequency offset in the channel one was equaled to one in the channel two in real-time.