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This paper addresses problems related to time and frequency synchronization as well as blind CP (cyclic prefix) type identification in 3GPP LTE system. We start with a general framework based on maximum likelihood (ML) parameter estimation. Then, simplified practical algorithms for estimating time and frequency offset as well as blind CP length are described. Finally, a robust hierarchical scheme...
An effective carrier frequency estimation method of MPSK signals based on symbol and carrier united synchronization is introduced. The carrier frequency and the symbol rate of MPSK signal are estimated roughly without the prior knowledge of the received signals. Then the symbol timing information is extracted with the wavelet transform, Based on symbol timing, the carrier frequency can be estimated...
An improved OFDM joint timing and frequency synchronization algorithm is proposed based on Schmidl algorithm aimed at the synchronization problem of orthogonal frequency division multiplexing (OFDM). It only requires one training symbol, and it makes an improvement to the method of symbol timing and integer frequency offset estimation in Schmidl algorithm. The estimation range of the proposed method...
A new training symbol with special structure is proposed aimed at the synchronization problem of orthogonal frequency division multiplexing (OFDM). Being different from many classical algorithm, the training symbol has special phase rotation relationship in the frequency domain. Based on this structure, a new joint symbol timing and frequency synchronization algorithm is presented. In the New algorithm,...
In this paper we consider the problem of data-aided synchronization in the up-link of a multiple access (MA) orthogonal frequency division multiplexing (OFDM) system based on offset quadrature amplitude modulation (OQAM). In particular, the joint maximum-likelihood (ML) phase offset, carrier-frequency offset (CFO) and symbol timing (ST) estimator exploiting a short known preamble embedded in the burst...
A novel data-aided joint symbol timing and carrier frequency offset estimation method based on selective superimposed pilot for OFDM system is proposed in this paper, where the pilot sequence is superimposed on a data sequence and transmitted together, and thus it has a high spectral efficiency. The selective pilot sequence owns low correlation with data sequence to reduce the interference. By taking...
In this paper, we present a new symbol timing and frequency synchronization method for OFDM WLAN system. A new method for synchronization using preamble structure of the IEEE 802.11a is proposed. The consecutive preamble structure is exploited to find the symbol starting-point and frequency offset accurately even under low SNR. The proposed timing synchronizer performs the fine timing synchronization...
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