| 摘要 |
A method of rapid non-data aided carrier signal acquisition for a low symbol rate carrier signal, comprising receiving and converting an analog intermediate frequency carrier to a digital carrier signal, down-converting the signal to substantially baseband, reducing a sampling rate of the digital carrier signal using a decimation filter, determining a highest Fast Fourier Transform (FFT) based on a result of one or more FFT's generated by an FFT module using a peak finder, selecting an input source for the FFT module using a multiplexer, generating a frequency estimate of the digital carrier signal using a walking coarse detector, tuning a carrier recovery loop (CRL) based on the frequency estimate generated by the walking coarse detector, determining a final carrier frequency offset estimate using a result of the FFT module, modulation removal, and the peak finder, and programming an oscillator within the CRL to the final carrier frequency offset estimate. |
| 主权项 |
1. A method of rapid non-data aided carrier signal acquisition for a low symbol rate carrier signal, the method comprising:
receiving, by a receiver, an analog intermediate frequency carrier signal; converting the analog intermediate frequency carrier signal to a digital carrier signal using an analog-to-digital converter; down-converting the digital carrier signal to a frequency substantially at baseband using a digital quadrature tuner; reducing a sampling rate of the digital carrier signal using a decimation filter; determining a highest Fast Fourier Transform (FFT) based on a result of one or more FFT's generated by an FFT module using a peak finder; selecting an input source for the FFT module using a multiplexer; generating a frequency estimate of the digital carrier signal using a walking coarse detector (WCD); tuning a carrier recovery loop (CRL) based on the frequency estimate generated by the walking coarse detector; determining a final carrier frequency offset estimate using a result of the FFT module, modulation removal, and the peak finder; and programming an oscillator within the CRL to the final carrier frequency offset estimate using a processor such that carrier signal lock is achieved. |
