移動(dòng)水聲通信多徑傳輸非一致多普勒估計(jì)方法研究
doi: 10.11999/JEIT140665 cstr: 32379.14.JEIT140665
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(11204109)，江蘇省高校自然科學(xué)基金(12KJB510003, 13KJB510007)，江蘇省高校優(yōu)勢(shì)學(xué)科項(xiàng)目和江蘇省青藍(lán)工程項(xiàng)目資助課題
Study on Non-uniform Doppler Estimation for Underwater Acoustic Mobile Communications with Multipath Transmission
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摘要: 現(xiàn)有水聲通信中的多普勒估計(jì)方法一般都假定多徑信道每條路徑的多普勒因子相等，當(dāng)各路徑多普勒因子存在差異時(shí)，該類方法往往無(wú)法正確估計(jì)出每徑的多普勒因子，導(dǎo)致補(bǔ)償后的信號(hào)存在較大誤差。為此該文在分析水聲信道稀疏特性的基礎(chǔ)上，提出一種基于稀疏表示理論的非一致多普勒估計(jì)方法。該方法結(jié)合水聲多徑信道與非一致多普勒稀疏特性生成包含信道信息的超完備字典，將每徑的非一致多普勒因子估計(jì)轉(zhuǎn)化為基于超完備字典的稀疏重構(gòu)求解，實(shí)現(xiàn)非一致多普勒因子的準(zhǔn)確估計(jì)。仿真結(jié)果表明，所提方法不僅能估計(jì)出差異較大的非一致多普勒因子，而且對(duì)于大多普勒頻偏的估計(jì)也相當(dāng)有效，特別適合于高速移動(dòng)水聲通信中的多普勒估計(jì)。Abstract: The existing methods of Doppler estimation in UnderWater Acoustic (UWA) communication generally assume that the Doppler factor of each path is equal in multipath channel. But when the Doppler factors are different from each other, such methods can not estimate the Doppler factor correctly, resulting in significant compensation error. By analyzing the sparsity of the UWA channel, a novel method of non-uniform Doppler estimation is proposed, which is based on the sparse representation theory. By using the over-complete dictionary combining UWA multipath channel and non-uniform Doppler sparsity, the method transforms Doppler estimation of each path into sparse solution reconstruction, achieving accurate estimation of non-uniform Doppler factor. Simulation results show that the proposed method can estimate not only the quite different Doppler factors but also the large Doppler frequency offset. Therefore, it is especially important for Doppler estimation in high-speed mobile UWA communication.
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