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Design and implementation in USRP of a preamble-based synchronizer for OFDM systems

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Document pages: 6 pages

Abstract: The Orthogonal Frequency Division Multiplexing (OFDM) is one of the mostwidely adopted schemes in wireless technologies such as Wi-Fi and LTE due toits high transmission rates, and the robustness against IntersymbolInterference (ISI). However, OFDM is highly sensitive to synchronism errors,which affects the orthogonality of the carriers. We analyzed severalsynchronization algorithms based on the correlation of the preamble symbolsthrough the implementation in Software-Defined Radio (SDR) using the UniversalSoftware Radio Peripheral (USRP). Such an implementation was performed in threestages: frame detection, comparing the autocorrelation output and the averagepower of the received signal; time synchronism, where the cross-correlationbased on the short and long preamble symbols was implemented; and the frequencysynchronism, where the Carrier Frequency Offset (CFO) added by the channel wasdetected and corrected. The synchronizer performance was verified through theUSRP implementation. The results serve as a practical guide to selecting theoptimal synchronism scheme and show the versatility of the USRP to implementdigital communication systems efficiently.

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