| DSSS数字接收机的AFC算法及其实现 |
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| 引用本文： | 胡修林,胡磊国,汤晓丹,张大卫.DSSS数字接收机的AFC算法及其实现[J].电子工程师,2004,30(5):15-18. |
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| 作者姓名： | 胡修林 胡磊国 汤晓丹 张大卫 |
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| 作者单位： | 华中科技大学电子与信息工程系,湖北省武汉市,430074 |
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| 摘 要： | 介绍了一种零中频直接序列扩频(DSSS)数字接收机的自动频率控制(AFC)算法及其仿真和实现.该算法从残留载波跟踪解调环的鉴相信号中提取频偏信息,对下变频本振进行AFC,并且可根据对频偏的估计切换环路特性,使环路既有较大的捕获带宽,又具有较好的跟踪和滤波性能.该算法适用于无导频的直扩BPSK信号接收机,其特点是算法复杂度低,特别易于FPGA实现.
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| 关 键 词： | 扩频接收机 零中频 直接序列扩频 载波跟踪 自动频率控制 |
| 修稿时间： | 2004年1月6日 |
AFC Algorithm for Direct-sequence Spread Spectrum Digital Receiver and Its Implementation |
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| Hu Xiulin,Hu Leiguo,Tang Xiaodan,Zhang Dawei.AFC Algorithm for Direct-sequence Spread Spectrum Digital Receiver and Its Implementation[J].Electronic Engineer,2004,30(5):15-18. |
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| Authors: | Hu Xiulin Hu Leiguo Tang Xiaodan Zhang Dawei |
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| Abstract: | This paper introduces an AFC algorithm for a zero-intermediate frequency direct-sequence spread spectrum digital receiver. In this algorithm, frequency offset information obtained from phase detecting of a carrier tracking loop is used to control automatically the frequency of local oscillator so as to gain better despreading and demodulating performance. This AFC algorithm is suitable for DSSS/ BPSK signal receiver. Its characteristics are high receiving sensitivity and less complexity. It is especially convenient for a FPGA implementation. |
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| Keywords: | FPGA |
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