宽带卫星通信信号的多维星座图解调方法
发布时间：2018-08-13 13:38
【摘要】：高速卫星数据传输需要利用较高调制维度和较多星座点数来实现,一方面导致接收端具有较大实现复杂度,另一方面系统可靠性极易受信道非线性影响。针对以上问题,通过对多维星座图信号的解调性能进行理论分析,得到极大后验概率(MAP)解调误符号率(SER)的理论公式,在保证系统SER性能的基础上,提出了基于星座图相关的检测方法。该方法利用脉冲正交性得到接收星座点,对其进行向量相关运算得到解调数据,有效降低了解调判决过程的复杂度。针对信号经过高功率放大器(HPA)后的非线性失真问题,建立了HPA信道估计模型,利用最小二乘(LS)信道估计方法对原解调星座图进行修正,提出了基于修正星座图的解调方法。仿真结果表明,该方法在降低实现复杂度的同时,有效提高了系统抗HPA信道非线性失真的能力,可实现对宽带高速卫星通信信号的高效准确解调。
[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.
【作者单位】： 海军航空工程学院电子信息工程系;
【基金】：国家自然科学基金(60772056) 山东省“泰山学者”建设工程专项经费资助(ts20081130)~~
【分类号】：V474;TN927.2
[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.
【作者单位】： 海军航空工程学院电子信息工程系;
【基金】：国家自然科学基金(60772056) 山东省“泰山学者”建设工程专项经费资助(ts20081130)~~
【分类号】：V474;TN927.2
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