因為無線通訊的訊號，在經過外在通道環境後，常會發生一些相位偏差，或物體在移動的都普勒效應等等造成頻率偏移，也有可能是發送的子載波本身也有頻率誤差，這些誤差會成解碼實訊號難以重建。 在此研究中，使用真實LTE(Long Term Evolution)的PDSCH (Physical Downlink Shared Channel)訊號錄製成數位檔案，再用C++程式軟體解碼，使用CP來做CFO補償，並以LTE規格中的PSS(主同調訊號)的ZC(Zadoff-Chu)序列來做頻率和相位同調修正。實作過程是以MATLAB軟體模擬ZC序列的各種性質，然後再用C++解真實訊號存成的數位檔案。 Because wireless signals in the channel through the external environment, often will be some phase error, or objects moving in Governor frequency offset caused by Doppler effect, etc., may also be sent to sub-carrier frequency itself has errors, these errors will become difficult to decode the real signal reconstruction. In this study, using real-LTE (Long Term Evolution) of PDSCH (Physical Downlink Shared Channel) signal is recorded as a digital file, then C + + programming software decoding, using the CP to do the CFO compensation, and LTE specifications in the PSS (the main coherent signal) of ZC (Zadoff-Chu) sequences to do the correct frequency and phase coherent. Implementation process is based on MATLAB software simulation ZC sequence of the various properties, and then use the C + + solution of the real signal is stored as digital files.
