Full-range pilot-assisted frequency offset estimation for OFDM communication systems

摘要

A training symbol with two identical halves as well as a pilot-tone at a center frequency is used for both timing synchronization and carrier frequency offset estimation. A timing synchronization is achieved by finding a peak of a cross-correlation function of the two halves in the first symbol. A fraction part of the frequency offset FO is then calculated from a phase difference between the two halves of the first training symbol. Then, the received signal is compensated for the fraction part of FO, and, an integer part of the FO is obtained by counting the shifted positions of the pilot-tone peak in the frequency domain.

主权项

1. A computer implemented method comprising:
providing full-range pilot assisted frequency offset estimation in an orthogonal frequency-division multiplexing OFDM communication system, the providing comprises: using a single training symbol with two identical halves as well as a pilot-tone at a center frequency for both timing synchronization and carrier frequency offset estimation; achieving a timing synchronization by finding a peak of a cross-correlation function of the two halves in a first symbol; calculating a fraction part of a frequency offset FO from a phase difference between the two halves of a first training symbol; compensating a received signal for the fraction part of the frequency offset FO; and obtaining an integer part of the FO by counting shifted positions of a pilot-tone peak in a frequency domain of received data in the OFDM communication system.