Proper

Abstract

In the world of digital communication, carrier synchronization and symbol synchronization are fundamentally important. The accuracy in estimation of two quantities has a direct effect on received data error rates. Costas receiver is a synchronous receiver system, appropriate for demodulating DSB-SC waves. Carrier recovery is essential for the operation of a coherent demodulator. For good reception, the transmitter and receiver should be perfectly matched in frequency and phase. To fulfill this purpose, Costas loop is commonly used in wireless communication and also in microwave systems. Costas loop is a non-linear based Phase Locked Loop. In this paper we explain about the different ways in which Costas loop is employed for different applications.