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A nonlinear system being composed of multiadaptive notch filters in parallel is introduced to track the sinusoidal components of an almost periodic signal and estimate their frequencies and amplitudes. An almost periodic nonlinear dynamic system for estimation of frequencies is achieved after the existence of a slow integral manifold is proved and results in a nonlinear autonomous system with averaging...
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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