A simple and robust carrier frequency recovery scheme for DVB-S2 systems

We propose a simple and robust carrier frequency recovery (CFR) scheme for DVB-S2 receivers. The proposed coarse CFR scheme employs a modified Mengali and Morelli (M&M) algorithm and recovers a coarse carrier frequency offset (CFO) accurately. After coarse CFR, a fine CFR scheme that employs a simple pilot block correlation algorithm recovers a residual CFO. The proposed scheme shows a bit error rate (BER) performance that is almost the same as the conventional scheme, and reduces the hardware complexity. In addition, when a normalized CFO is larger than 25%, the proposed scheme could achieve carrier synchronization (the conventional scheme might not achieve carrier synchronization).