ScholarWorks@숙명여자대학교

초록

This study proposes a technique for estimating phase rotation offset of received symbols in Space Frequency Line Code–Orthogonal Frequency Division Duplexing (SFLC-OFDM) systems under asymmetric channel amplitude conditions between the uplink and downlink. SFLC-OFDM assumes symmetry between the uplink and downlink channels and performs encoding based on estimated uplink channel information. However, due to channel amplitude asymmetry, distortion occurs in the phase of received symbols, leading to a rotation of the phase of decoding symbols derived from the operation of received symbols, thus deteriorating the decoding performance. In this study, we present a method for estimating errors causing phase rotation through mathematical analysis. Additionally, a testbed utilizing software modem-based Universal Software Radio Peripheral (USRP) is constructed to experimentally verify the estimation of phase rotation errors using the proposed technique.

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