Six Algorithms for Frequency Offset Estimation in OFDM Systems

Автор: Ahmed M. Alaa

Журнал: International Journal of Information Technology and Computer Science(IJITCS) @ijitcs

Статья в выпуске: 5 Vol. 6, 2014 года.

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Generally, wireless systems suffer from Carrier Frequency Offsets (CFO), which results either from the receiver’s oscillator’s impairments or Doppler shifts. The frequency offset between transmitter and receiver local oscillator is a main drawback of OFDM systems. A frequency drift in the receiver’s oscillator would result in a frequency offset in the received signal, this offset consists of two parts: a Fine offset, as a fraction of OFDM subcarrier spacing, and a Coarse offset that is equal to an integer multiple of the subcarrier spacing. Coarse offsets results in two problems; firstly, the modulation symbols are located on the wrong frequency bins, secondly, the pilots used for channel estimation are misplaced leading to a faulty channel estimate and severe signal distortion by the Equalizer. Fine Offsets result in a loss of orthogonality and thus ICI (Inter-Carrier Interference), as the frequency bin of a certain modulation symbol would contain some information about the neighboring symbol bin.

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Orthogonal Frequency Division Multiplexing (OFDM), Carrier Frequency Offset (CFO), Frequency Offset Estimation, Frequency Synchronization, Baseband Processing

Короткий адрес: https://sciup.org/15012079

IDR: 15012079

Список литературы Six Algorithms for Frequency Offset Estimation in OFDM Systems

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