Turkish Journal of Electrical Engineering and Computer Sciences




Two of the most counterproductive effects that must be dealt with in communication systems in realistic environments are carrier frequency offset (CFO) and time-varying channels. These problems are usually addressed by using independent approaches for each one. This paper introduces an algorithm that attacks both of these effects in a joint fashion. It is based on a rough compensation of CFO, and after considering that the remaining CFO uncertainty can be seen as part of the time-varying channel a channel estimation that includes that composite channel is performed. Particularly, the channel estimation based on projection onto a bidimensional basis is shown to be adequate to perform this process. The approach suggested in this paper is illustrated for a superimposed training-based communication system. Simulation results corroborate the validity of the proposed algorithm, where the performance obtained is similar to that achieved for the time-varying channel estimators based on bidimensional basis projection when no CFO is present.


Carrier frequency offset, communication channel estimation, orthogonal basis expansion, superimposed training

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