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Modeling of Non-Coherent Sequential acquisition Process for DS/SS Signals

Journal of Systems Engineering and Electronics 2003年第4期14卷 13-19页

作者：李艳马雨出张中兆 Communication Research Center Harbin Institute of Technology Harbin 150001 P. R. China

A modified non-coherent sequential detection decision logic based on continuous accumulation to achieve fast pn code acquisition is proposed. To simplify the design and analysis, the equivalent relationship between the likelihood ratio of the current sample and that of all the previous samples is deduced. The scheme is proved to be an optimum sequential detection under certain assumptions. Because the average sample number (ASN) can not be calculated through the methods applied to the conventional sequential detection, an algorithm is also provided, which can estimate both the probability density function (pdf) and the upper threshole of ASN. The desired probabilities of false alarm and detection, as well as faster pn code acquisition compared to the conventional sequential detection can be achieved by employing this structure . In addition, Rayeigh-faded reception case is also taken into consideration. Performances of the proposed schemes are obtained, which suggest that the proposed non-coherent sequential detection is more desirable.

关键词： pn code acquisition spread spectrum sequential detection.

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An Intermediate Frequency acquisition Scheme for S-band Single Access Link of the Tracking and Data Relay Satellite System

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High Technology Letters 2001年第1期7卷 31-36页

作者：马雨出 Gu Xuemai Zhang Naitong Communications Research Center Harbin Institute of Technology

A nonzero intermediate frequency (IF) likelihood acquisition scheme designed for S-band Single Access (SSA) link of China’s Tracking and Data Relay Satellite System (CTDRSS) is introduced. The received signal is downconverted to IF, and then direct sampled in IF using a 1-bit A/D. After the digitalization, the sampled data is detected using a hybrid likelihood acquisition scheme. Using this structure, large noise figure of the analog mixer or active filters, amplitude and phase imbalance between low-frequency in-phase and quandrature-phase channel can be avoided. An easy designing algorithm of the acquisition scheme is also derived. The performance and algorithm are verified by computer simulation.

关键词： Digital receiver Likelihood detector pn code acquisition Satellite communications

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