TIMING CONTROL IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEX SYSTEMS BASED ON EFFECTIVE SIGNAL-TO-NOISE RATIO

摘要

A SPREAD-SPECTRUM COMMUNICATION SYSTEM PROVIDES AN EFFECTIVE SIGNAL-TO-NOISE RATIO (SNR) OF RECEIVED ORTHOGONAL FREQUENCY DIVISION MULTIPLEX (OFDM) SLOTS IN THE PRESENCE OF TIMING ERRORS. EFFECTIVE SNR CAN SERVE AS A DIAGNOSTIC TOOL FOR DETERMINING WHETHER THERE WAS A TIMING ERROR WHEN A MEASURED PACKET ERROR RATE (PER) REMAINS HIGH, AND A PREDICTED PER FROM THE EFFECTIVE SNR REMAINS LOW. A LOOP CAN USE THE EFFECTIVE SNR TO CONTROL A TIME REFERENCE USED BY AN OFDM DECODER.