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A simplified nonlinear least square (NLS) carrier frequency offset (CFO) estimation scheme is proposed based on an OFDM training symbol with L identical parts. Since the NLS CFO estimate scheme has no close-solution, the estimate process is divided into two steps of fine and coarse estimations. The fine estimation is obtained by the correlation of two identical halves in the training symbol. After...
The conventional two-step carrier frequency offset (CFO) estimator using L identical parts is analyzed. It turns out that the conventional two-step CFO estimator is not optimal in terms of MSE. A novel two-step CFO estimator is proposed in this paper. In fist step, a fine estimate is obtained based on the principle of minimum variance. The fine estimation has ambiguity since its estimate range is...
The decision-directed space-alternating generalized expectation-maximization (SAGE) algorithm is introduced in [1] to estimate the channel and track the channel varying for OFDM systems with transmitter diversity. However, this method is based upon a discrete Fourier transform (DFT), which will cause power leakage and result in an error floor in a multipath channel with non-sample-spaced time delays...
In this paper, a novel preamble which is composed of two OFDM training symbols with different numbers of identical parts is designed for OFDM systems. Based on the designed preamble, we propose a high performance frequency offset estimator by jointly using the CFO estimations independently obtained from the two training symbols. By elaborately selecting the values of the numbers of identical parts,...
A fast frequency offset estimation scheme for OFDM is proposed. This scheme is low-overhead oriented, which uses only one OFDM symbol with L identical slots as preamble. By extracting the phase from correlation between two identical halves of the preamble, the fractional frequency offset is estimated and then compensated. After reshaping the compensated preamble into many L-point sub-symbols, which...
A novel frequency offset estimate method is proposed for OFDM systems. In the proposed method, a special preamble composed of two training symbol blocks with several wide-sense identical parts is designed. To obtain a large estimate range together with a good estimation performance, a novel three-stage CFO estimate scheme based on the designed preamble is proposed. In this scheme, initial CFO estimates...
A novel scheme of integer frequency offset (IFO) estimation for OFDM systems is proposed based on an OFDM training symbol with several identical parts. In this scheme, the received OFDM training symbol is first reshaped into several sub-symbols by selecting the samples with the same index in each part. It shows that the reshaping process introduces time diversity. The IFO is estimated by finding the...
The frequency offset estimation for OFDM systems using the correlations of several identical parts in the preamble is addressed. We design a novel preamble which is composed of one irregular OFDM training symbol block with odd numbers of identical parts and one regular OFDM training symbol block with even numbers of identical parts. Based on the designed preamble, we propose a novel frequency offset...
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