Synchronization for RF carrier frequency hopped OFDM: analysis and simulation

8 July 2004

proceedings article
Published by Institute of Electrical and Electronics Engineers (IEEE)

Vol. 2, 1237-1242
https://doi.org/10.1109/milcom.2003.1290382

Abstract

In this work, we apply RF carrier frequency hopping to Orthogonal Frequency Division Multiplexing (FH OFDM) and study the hop rate capability using realistic performance of signal acquisition/synchronization of the unknown time and frequency offset parameters. OFDM synchronization is a challenging task without RF carrier hopping due to OFDM's sensitivity to time and frequency offsets. Given sufficient synchronization estimation performance is achieved. our objective is to determine the hop rate capabilities for OFDM using two different data-aided synchronization approaches. The first method is based on sending information in a preamble before the OFDM payload symbol. The second method embeds known synchronization information directly into the OFDM symbol stream. Using differential QPSK-OFDM modulation and spectral efficiency greater than 1 bps/Hz. results indicate that sufficient synchronization performance can be achieved for hop rates greater than 6 and 1 khops/sec for the preamble- and embedded-based synchronizers. respectively.

Keywords

This publication has 4 references indexed in Scilit:

On the distribution of the peak-to-average power ratio in OFDM signals
IEEE Transactions on Communications, 2001
Time and frequency synchronization for OFDM using PN-sequence preambles
Published by Institute of Electrical and Electronics Engineers (IEEE) ,1999
OFDM time and frequency synchronization by spread spectrum pilot technique
Published by Institute of Electrical and Electronics Engineers (IEEE) ,1999
Robust frequency and timing synchronization for OFDM
IEEE Transactions on Communications, 1997