一种基于DSP的EV-DO联合频偏估计算法

EV-DO Joint Frequency Offset Estimation Algorithm Based on DSP

在DSP平台上设计CDMA2000 1X EV-DO反向链路频偏估计算法。针对传统的FFT频偏估计及其改进算法易受栅栏效应和噪声影响等缺点,通过设置合理的频偏因子门限,在FFT频偏估计算法基础上设计了幅度校正和CZT变换的联合频偏估计算法。通过仿真和计算量统计,文章算法在计算量增加不大的情况下相比传统FFT类算法可以获得较好的频偏估计性能。

This paper designs CDMA2000 1X EV-DO reverse channel frequency offset estimation algorithm based on DSP. Aiming at the shortcoming of conventional FFT and its amended algorithm, such as having picket-fence effect and being sensitive to noise, and by choosing suitable frequency offset factor.threshhold, a frequency offset estimation algorithm of amplitude amendation combined with CZT transformation is designed, based on the algorithm of FFT frequency offset estimation. The simulation result shows this algorithm gains better performance than traditional FFT algorithms ,while the computation increases not much.