Adaptive frequency correction method for enhanced sensitivity CDMA acquisition

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005. Pub Date : 2005-12-01 DOI:10.1109/GLOCOM.2005.1577463

A. Schmid, A. Neubauer, C. Günther

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引用次数: 2

Abstract

Location based services with Galileo/GPS satellite receivers integrated in mobile phones are expected to experience a substantial market growth. Satellite signals are usually received on the earth surface with very low signal energy. Attenuation, shadowing, and multipath fading in urban canyons and moderate indoor environments impose challenging acquisition conditions for the state-of-the-art enhanced sensitivity mobile satellite receivers. Residual frequency deviations between the down-conversion frequency and the received signal frequency due to unknown Doppler frequency shifts significantly reduce the signal acquisition sensitivity of current satellite receivers. This paper shows how the residual frequency deviation can be reduced incrementally towards zero much faster than the CDMA code synchronization be detected with sufficient probability. This paper furthermore derives the probability density functions for the signal detection using the adaptive frequency correction method and illustrates the acquisition sensitivity gain of around 4 dB for different Galileo and GPS satellite receiver configurations.

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增强灵敏度CDMA采集的自适应频率校正方法

在移动电话中集成伽利略/GPS卫星接收器的基于位置的服务预计将经历一个可观的市场增长。卫星信号通常在地球表面接收，信号能量很低。衰减、阴影和多径衰落在城市峡谷和中等室内环境中对最先进的增强灵敏度移动卫星接收机的采集条件提出了挑战。未知多普勒频移导致的下变频频率与接收信号频率之间的剩余频率偏差显著降低了当前卫星接收机的信号采集灵敏度。本文展示了如何以足够的概率检测到CDMA码同步时，将剩余频率偏差逐渐减小到零。本文进一步推导了采用自适应频率校正方法进行信号检测的概率密度函数，并举例说明了不同伽利略和GPS卫星接收机配置下的采集灵敏度增益约为4 dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

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