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1. False Lock Performance in Polarity-Type Costas Receivers in the Presence of Periodic Data Patterns

Author

Dennis Teng-Tsun Lai, Veronica Siang-Gek Heng, James June-Ming Wang, and Robert D. Godfrey

Subjects
Periodic function, Record locking, Asynchronous communication, Computer science, Costas loop, Electronic engineering, Key (lock), Carrier recovery, Algorithm, Phase-shift keying, Data transmission
Abstract

This paper addresses the false lock performance of receivers which use polarity-type Costas loops for the carrier recovery of unbalanced QPSK, asynchronous QPSK or BPSK signals in the presence of periodic data patterns. The potential false lock frequencies are first identified. Expressions for both true lock and false lock components are also derived, thereby allowing numerical evaluation of various key parameters for cases of practical interest.

Published
1987

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