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- W2125163486 abstract "We investigate the problem of carrier frequency offset (CFO) recovery in an OFDM direct-conversion receiver plagued by both dc-offset and frequency-selective I/Q imbalance. In order to enlarge the frequency acquisition range, the CFO is divided into an integer part, which is multiple of the subcarrier spacing, plus a remaining fractional part. The fractional CFO is firstly estimated by resorting to the least-squares (LS) principle using a suitably designed training sequence. Since the exact LS solution requires a complete search over the frequency uncertainty range, we propose a simpler scheme that dispenses from any peak-search procedure. We also derive an approximated closed-form expression of the estimation accuracy that reveals useful for assessing the impact of various design parameters on the system performance. After computing the fractional CFO, the integer frequency error is eventually retrieved by following a weighted LS approach. Numerical simulations and theoretical analysis indicate that the proposed scheme can be used to obtain accurate CFO estimates with affordable complexity." @default.
- W2125163486 created "2016-06-24" @default.
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- W2125163486 date "2012-07-01" @default.
- W2125163486 modified "2023-09-25" @default.
- W2125163486 title "Carrier Frequency Offset Estimation for OFDM Direct-Conversion Receivers" @default.
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- W2125163486 doi "https://doi.org/10.1109/twc.2012.051512.120057" @default.
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