多徑軟擴(kuò)頻信號(hào)偽碼周期盲估計(jì)
[Abstract]:In order to solve the problem that the pseudo code period of soft spread spectrum signals is difficult to estimate due to multipath fading in multipath channels, a blind pseudo code period estimation method for soft spread spectrum signals based on secondary power spectrum is proposed. Firstly, the general single path soft spread spectrum signal is extended to the multipath model, then the primary power spectrum of the signal is calculated on the basis of the multipath soft spread spectrum signal model. Secondly, the obtained primary power spectrum is used as the quadratic power spectrum of the input signal to calculate the signal. The theoretical analysis shows that the peak power spectrum of the signal will appear at the integer times of the pseudo-code period. Finally, the pseudo code period estimation of multipath soft spread spectrum signals can be realized by detecting the spacing between peak spectral lines. The simulation results show that the proposed method can improve the SNR of 1 dB and 2 dB compared with the time domain correlation method when the accuracy rate of pseudo code period estimation is 100 bits and the length of pseudo code sequence is 127 bits and 255 bits. Under the same contrast condition, the average accumulative times required are less than the time domain correlation method. The experimental results show that the proposed method not only reduces the computational complexity but also improves the accuracy of the estimation.
【作者單位】: 重慶郵電大學(xué)信號(hào)與信息處理重慶市重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(61671095,61371164) 信號(hào)與信息處理重慶市市級(jí)重點(diǎn)實(shí)驗(yàn)室建設(shè)項(xiàng)目(CSTC2009CA2003) 重慶市教育委員會(huì)科研項(xiàng)目(KJ130524,KJ1600427,KJ1600429)~~
【分類號(hào)】:TN914.42
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