Complexity Efficient Least Squares Estimation of Frequency Offsets for DVB-C2 OFDM Systems

In this paper, we propose an efficient least squares estimation (LSE) of carrier frequency offset (CFO) and sampling frequency offset (SFO) in a second generation digital transmission system for cable system using orthogonal frequency division multiplexing. For this purpose, non-uniformly distributed continual pilots (CPs) are used for CFO and SFO synchronization, which are grouped into subsets to make the proposed LSE scheme unbiased. Numerical simulations are carried out to assess the performance of the proposed LSE scheme as well as to compare it against the conventional schemes fully using CPs. It has confirmed that the proposed LSE scheme works well in an unbiased fashion with a reduced complexity, compared with the conventional schemes.