寬帶衛(wèi)星通信信號的多維星座圖解調(diào)方法
[Abstract]:High speed satellite data transmission needs higher modulation dimension and more constellation points. On the one hand, the receiver has a large complexity, on the other hand, the system reliability is easily affected by the channel nonlinearity. In view of the above problems, through the theoretical analysis of the demodulation performance of the multi-dimensional constellation signal, the theoretical formula of the maximum posterior probability (MAP) demodulation error symbol rate (SER) is obtained, which ensures the system SER performance. A detection method based on constellation correlation is proposed. In this method, the received constellation points are obtained by pulse orthogonality, and the demodulation data are obtained by vector correlation operation, which effectively reduces the complexity of the demodulation decision process. In order to solve the problem of nonlinear distortion of signal after high power amplifier (HPA), the HPA channel estimation model is established. The original demodulation constellation diagram is modified by using the least square (LS) channel estimation method, and a demodulation method based on modified constellation diagram is proposed. The simulation results show that the proposed method not only reduces the complexity of the implementation, but also improves the ability of the system to resist the nonlinear distortion of the HPA channel effectively, and can realize the efficient and accurate demodulation of the wideband and high-speed satellite communication signals.
【作者單位】: 海軍航空工程學院電子信息工程系;
【基金】:國家自然科學基金(60772056) 山東省“泰山學者”建設工程專項經(jīng)費資助(ts20081130)~~
【分類號】:V474;TN927.2
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