6 research outputs found
Frequency Offset Tracking for OFDM Systems via Scattered Pilots and Virtual Carriers
In this paper, we propose a new carrier frequency
offset (CFO) tracking algorithm for orthogonal frequency division
multiplexing (OFDM) systems. Assuming that the channel
remains constant during two consecutive OFDM blocks, a CFO
estimation algorithm is proposed based on the limited number
of pilots in each OFDM block. Identifiability of this pilot based
algorithm is fully discussed under the noise free environment. A
weighted algorithm is then developed by considering both pilot
carriers and virtual carriers. The asymptotic mean square error
(MSE) of the proposed algorithm is provided, and simulation results
clearly show the performance improvement of the proposed
algorithm over the existing methods