| 摘要: |
| 介绍了QPSK调制的DSSS接收机中基于矩估计的信噪比估计算法,以及在FPGA上实现该算法的关键技术.由于实现误差超出期望,运用了基于曲线拟合的校正方案.以估计幅度值和幅度差值作为自变量和因变量,运用曲线拟合工具获得信噪比估计值应有的修正误差.依据该修正值调整测试值,可使信噪比估计性能大幅提升.最后通过实测证明了校正算法的性能. |
| 关键词: DSSS 信噪比估计算法 曲线拟合 FPGA |
| DOI：10.3969/j.issn.1001-893X. |
| 修订日期：2006-11-23 |
| 基金项目: |
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| Revised SNR Estimator Based on Curve Fitting |
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| Abstract: |
| In a QPSK modulated DSSS receiver,a moments SNR estimator is introduced along with its implementation on FPGA devices.To improve the estimator's precision,an algorithm based on curve fitting is applied.The estimated amplitude and amplitude offset are treated as independent variable and dependent variable,and a curve fitting tool is used to get the modification of SNR estimation.The precision of SNR estimation is improved remarkably by modifying the original SNR estimation according to the modification.Finally,the performance is tested and analyzed. |
| Key words: DSSS,SNR estimation algorithm,curve fitting,FPGA |
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