A Simplified Implementation Method of th-Power for Frequency Offset Estimation

A simplified implementation method of [Formula Omitted]th-power is investigated in this letter. Before frequency offset estimation (FOE), the [Formula Omitted]th-power operation is required to remove the modulated data phase. One disadvantage of [Formula Omitted]th-power operation is its large compu...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-06, Vol.28 (12), p.1317-1320
Main Authors: Han, Jilong, Li, Wei, Yuan, Zhilin, Zheng, Yansheng, Hu, Qianggao
Format: Article
Language:English
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Summary:A simplified implementation method of [Formula Omitted]th-power is investigated in this letter. Before frequency offset estimation (FOE), the [Formula Omitted]th-power operation is required to remove the modulated data phase. One disadvantage of [Formula Omitted]th-power operation is its large computational complexity, especially for high-order modulation systems. In this letter, we propose a low complexity method to approximately implement the [Formula Omitted]th-power. In the proposed method, we apply the absolute operation of real number to the real and imaginary parts of received symbols to remove their modulated data phases. In the simulation, the proposed method is compared with the [Formula Omitted]th-power operation in the 20-GBd quadrature phase-shift keying (PSK), 8 PSK, and square-16QAM systems for FOEs. The results show that the proposed method can approximately reach the same performance as the [Formula Omitted]th-power operation, but the complexity is reduced effectively and no multiplier is required.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2542844