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Orthogonal frequency division multiplexing (OFDM is a multi-carrier modulation technique which uses several orthogonal subcarriers to transmit/receive a high data rate signal. Proper synchronization must be done for the adequate working of the system. Initially Schmidl and Cox proposed a method, in which with the help of a training symbol, with two identical halves synchronization is achieved. Thereafter...
In this paper, to solve the problem of the Doppler estimation limited by FFT in the traditional code acquisition scheme based on FFT, a method of Doppler estimation for code acquisition based on segmental-FFT phase difference is proposed. First, the despreaded base band data with Doppler frequency is divided into two segments and the FFT is applied on them individually. Then, with the help of the...
In this paper, two fast and accurate FFT-based frequency offset estimation methods for OFDM systems are proposed. We analyze and simulate proposed methods in both Gaussian and multipath fading channels, and compare the results with those obtained using well known Schmidl's method. The simulation results are presented in terms of Error Variance (EV). Both proposed FFT-based methods have significantly...
In this paper, a novel approach for estimating signal parameter in clutter using chaos synchronization based on support vector machine (SVM) is proposed. Assuming that the clutter process is chaotic, chaos synchronization is found to be able to extract the weak signal even when the signal is totally embedded inside the clutter spectrum. When the dynamics of the chaotic system is unknown, an SVM-based...
In this paper, we propose a cooperative communation scheme using multi-symbol encapsulated orthogonal frequency division multiplexing (MSE-OFDM), in which one cyclic prefix (CP) is used for multiple OFDM symbols. We use the FFT size-reduced MSE-OFDM system which can be used to reduce the peak-to-average power ratio (PAPR) and improve the robustness to carrier frequency offset. The cooperative communication...
Based on simple comparison between a conventional navigation receiver and a GNSS software receiver, a generic GNSS receiver architecture is given, which focuses on the GPS IF signal processing algorithm in the channel. According to the channel states the algorithm falls into four parts: signal acquisition, confirmation, fine frequency estimation and tracking. A frequency domain acquisition based on...
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