64-qam Carrier Synchronization by an Extended Kalman Filtering
نویسندگان
چکیده
High Order Quadrature Amplitude Modulation (QAM) is a high-bandwidth-efficient modulation scheme employed in the wireless communications. For this type of modulation, one of the most important problems is carrier recovery to allow a coherent demodulation. To extract correctly the transmitted symbols as the carrier frequency offset between the transmitter and receiver is inevitable, the receiver must to provide blind fast carrier frequency synchronization. In order to track the frequency of the received signal, the receiver uses commonly a PhaseLocked-Loop (PLL) technique. An alternative to PLL carrier recovery is the use of Kalman filter algorithms.
منابع مشابه
Kalman Filtering Applied to Carrier Recovery of High- Order Qam Signals
A carrier synchronization algorithm for high-order QAM modulated signals that uses Kalman filtering techniques shows fast acquisition times and good frequency tracking performances. The algorithm relies on a decision directed extended Kalman filter combined with a lock detector which determines the status of the synchronization process, modifying consequently the filter parameters. Simulations ...
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