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As a novel code-acquisition scheme, the twin-cell detection (TCD) is proposed for the acquisition in time of spread-spectrum codes in the presence of fractional Doppler frequency offset (FDFO). When the FDFO exists, the correlation peak that is used for detection during the acquisition process is split into two neighboring peaks with smaller magnitudes, which results in a considerable degradation...
The single delta delay lock loop is the most widely used code tracking scheme for the GALILEO system that employs the binary offset carrier modulated spreading signal. When only a line-of-sight signal is received, the single delta delay lock loop is the optimal code tracking scheme. However, when the multipath signals are received, the correlation values are distorted, and thus, the tracking bias...
This paper analyzes the tracking performance of a delay lock loop (DLL) using chip waveform shaped code on direct sequence/spread spectrum (DS/SS) systems in multipath environments. In this paper, chip waveform shaping (CWS) filters consider a rectangular (RECT) filter and a raised cosine (RC) filter. It is assumed that a tracking scheme for code synchronization in a DS/SS system uses a single delta...
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