2009•Journal of Tsinghua University(Science and Technology)Requires access

Fine carrier synchronization algorithm based on similar property of the guard interval

Yang Zhixing

Abstract

The Inter-carrier interference(ISI) caused by the carrier frequency offset(CFO) severely degrades the performance of orthogonal frequency division multiplexing(OFDM) systems.Therefore,accurate carrier synchronization is essential in OFDM systems.This paper presents a fine carrier synchronization algorithm based on the similarities of the guard interval for time-domain synchronous OFDM(TDS-OFDM) systems.Analyses and simulations show that the algorithm is not only insensitive to symbol timing errors,but also has very high estimation accuracy.The normalized estimation variance can be reduced from 10-8 to 10-13.The algorithm also dramatically reduces the hardware complexity.

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Key concepts: Guard interval, Orthogonal frequency-division multiplexing, Carrier frequency offset, Computer science, Algorithm, Synchronization (alternating current), Time domain, Interference (communication)