【摘要】：高速衛(wèi)星數(shù)據(jù)傳輸需要利用較高調(diào)制維度和較多星座點(diǎn)數(shù)來實(shí)現(xiàn),一方面導(dǎo)致接收端具有較大實(shí)現(xiàn)復(fù)雜度,另一方面系統(tǒng)可靠性極易受信道非線性影響。針對(duì)以上問題,通過對(duì)多維星座圖信號(hào)的解調(diào)性能進(jìn)行理論分析,得到極大后驗(yàn)概率(MAP)解調(diào)誤符號(hào)率(SER)的理論公式,在保證系統(tǒng)SER性能的基礎(chǔ)上,提出了基于星座圖相關(guān)的檢測(cè)方法。該方法利用脈沖正交性得到接收星座點(diǎn),對(duì)其進(jìn)行向量相關(guān)運(yùn)算得到解調(diào)數(shù)據(jù),有效降低了解調(diào)判決過程的復(fù)雜度。針對(duì)信號(hào)經(jīng)過高功率放大器(HPA)后的非線性失真問題,建立了HPA信道估計(jì)模型,利用最小二乘(LS)信道估計(jì)方法對(duì)原解調(diào)星座圖進(jìn)行修正,提出了基于修正星座圖的解調(diào)方法。仿真結(jié)果表明,該方法在降低實(shí)現(xiàn)復(fù)雜度的同時(shí),有效提高了系統(tǒng)抗HPA信道非線性失真的能力,可實(shí)現(xiàn)對(duì)寬帶高速衛(wèi)星通信信號(hào)的高效準(zhǔn)確解調(diào)。
[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(xué)院電子信息工程系;
【基金】：國家自然科學(xué)基金(60772056) 山東省“泰山學(xué)者”建設(shè)工程專項(xiàng)經(jīng)費(fèi)資助(ts20081130)~~
【分類號(hào)】：V474;TN927.2

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