摘要
针对PMF-FFT运算量大、长码捕获时间长的问题,提出了一种补偿平均IPMF-FFT算法。通过采用基于重叠处理的相位并行处理方法和对FFT算法进行优化,有效降低了系统捕获时间和运算量,使其更适用于扩频码较长的应用场景。理论和仿真结果表明,所提方法可以提高重叠相位较差情况下的信噪比增益,同时大大降低平均捕获时间和运算量。此外,在FFT运算点数和码周期相同时,提出的方法还扩大了捕获频域范围,使其可以运用于高动态应用场景。
Aiming at the problem of large computational complexity and long acquisition time of PMF-FFT, a compensation average IPMF-FFT algorithm is proposed. By using the phase parallel processing method based on overlap processing and the optimization of FFT algorithm, the acquisition time and computational complexity of the system could be effectively reduced, thus making it more suitable for longer application scenarios of spread spectrum code. The theoretical analysis and simulation result indicate that the proposed method could improve the SNR gain in the case of poor overlap phase, and greatly reduce the average acquisition time and computational complexity. In addition, the proposed method could also extend the acquisition-frequency range when the number of FFT operation is the same as that of the code cycle, so that it may be applied to the highly-dynamic application scenarios.
出处
《通信技术》
2017年第11期2426-2431,共6页
Communications Technology
