窄帶干擾條件下含有未知載頻的直擴(kuò)信號的偽碼序列估計(jì)

沈斌; 王建新

doi:10.11999/JEIT141322

窄帶干擾條件下含有未知載頻的直擴(kuò)信號的偽碼序列估計(jì)

doi: 10.11999/JEIT141322

沈斌¹,
王建新¹

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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2014-10-15
- 修回日期: 2015-03-19
- 刊出日期: 2015-07-19

Estimation of PN Sequence in DSSS Signals with Unknown Carrier Frequency under Narrow Band Interferences

Shen Bin¹,
Wang Jian-xin¹

摘要

摘要: 為了解決窄帶干擾條件下含有未知載頻的直擴(kuò)信號的偽碼序列的估計(jì)問題，該文在已知碼片速率和偽碼周期的前提下，提出一種結(jié)合矩陣特征分解和線性調(diào)頻Z變換的偽碼序列盲估計(jì)算法。該方法對接收信號分段獲得觀察向量，并對觀察向量的相關(guān)矩陣進(jìn)行特征分解，最后應(yīng)用改進(jìn)的最小描述長度(MDL)準(zhǔn)則和線性調(diào)頻Z變換(CZT)對特征向量進(jìn)行處理，可以估計(jì)出窄帶干擾信號，同時(shí)還可以估計(jì)出信號的載頻和偽碼序列。仿真實(shí)驗(yàn)給出了不同干擾信號和不同偽碼序列長度時(shí)算法的性能曲線，理論分析和仿真結(jié)果都表明了該方法能有效地工作在較低的信噪比下。
- 擴(kuò)頻通信 /
- 直接序列擴(kuò)頻信號 /
- 偽碼序列盲估計(jì) /
- 窄帶干擾 /
- 未知載頻 /
- 特征分解
Abstract: In this paper an approach of eigen-decomposition and Chirp Z Transform (CZT) for DSSS signals with unknown carrier frequency under narrow band interferences is proposed to estimate the PN sequence．The period and chip rate of PN sequence need to be known. Firstly, the received signal is divided into vectors. Then, the eigenvalue decomposition is applied to the correlation matrix of the vectors. Finally, the narrow band interference, the carrier frequency and the PN sequence can be estimated by applying the improved Minimum Description Length (MDL) criteria and the Chirp-Z Transform (CZT) method on the eigenvectors. Simulation experiments show the performance curves at different SNRs with different periods of PN sequence under different narrow band interferences. Theory analysis and simulation results show that the approach can work effectively under low SNR．
- Spread spectrum communication /
- Direct Sequence Spread Spectrum (DSSS) signal /
- PN sequence blind estimation /
- Narrow band interference /
- Unknown carrier frequency /
- Eigenvalue decomposition

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