Non-Linear Analysis of a Modied QPSK Costas Loop

Nikolay Kuznetsov1, Mikhail Blagov2, Elena Kudryashova2, Janos Ladvanszky3, Marat Yuldashev2, Renat Yuldashev4

  • 1Saint-Petersburg State Univ.
  • 2Saint Petersburg State University
  • 3Ericsson
  • 4St. Petersburg State University

Details

11:40 - 12:00 | Wed 4 Sep | Room FH 1 | WeB1.6

Session: Lyapunov-Based Methods in Control I

Abstract

The Costas loop is one of the classical phase-locked loop based circuits, which demodulates data and recovers carrier from the input signal. The Costas loop is essentially a nonlinear control system and its nonlinear analysis is a challenging task. In this article for a modified QPSK Costas loop we analyze the hold-in, pull-in and lock-in ranges. New procedure for estimation of the lock-in range is considered and compared with previously known approach. s.