Improved CFO Synchronization of Dual-Polarized OFDM Systems using Training Symbols
José Luis Hinostroza N., Osmar Tormena Jr., Silvio Oliveira e Silva Jr., Luís Geraldo P. Meloni

DOI: 10.14209/SBRT.2020.1570654615
Evento: XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2020)
Keywords: OFDM CFO synchronization quaternion OFDM CRLB training symbol
Abstract
In 5G and next-generation communications systems, as well as at wireless transmission using millimeter waves, dual polarization systems have gained recent interest. This paper presents carrier frequency offset (CFO) synchronization technique for Dual-Polarized Orthogonal Frequency Division Multiplex (DP-OFDM) based on the transmission of training symbols. The derived techniques lead to enhancing in performance in terms of variance of estimator against classic single-polarized (SP) complex version by using the same radiated power for fair comparisons. The synchronization technique and the Cramér- Rao lower bound are derived using quaternion algebra, which prove and corroborate along with simulations to the observed improvement in performance.

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