CAJ | 학술논문

对于短突发通信系统，基于时域相关函数数据辅助的频率估计方法中导频位置、导频数目对载波频率估计精度和估计范围有很大的影响，该文提出一种具有较高估计精度的基于相关函数和的频率估计算法，并推导出该算法的理论估计方差。通过分析导频位置对估计范围和估计精度的影响，提出一种可变 D 间距数据帧结构(VDPM)设计方案，即根据系统估计精度和估计范围的要求选择合适的导频间距。理论分析和仿真结果表明VDPM帧结构可以灵活地兼顾估计精度和估计范围的要求，基于相关函数和的频率估计算法仅利用很短的导频符号就能达到较高的估计精度，适合在短突发通信系统中应用。
대우단돌발통신계통，기우시역상관함수수거보조적빈솔고계방법중도빈위치、도빈수목대재파빈솔고계정도화고계범위유흔대적영향，해문제출일충구유교고고계정도적기우상관함수화적빈솔고계산법，병추도출해산법적이론고계방차。통과분석도빈위치대고계범위화고계정도적영향，제출일충가변 D 간거수거정결구(VDPM)설계방안，즉근거계통고계정도화고계범위적요구선택합괄적도빈간거。이론분석화방진결과표명VDPM정결구가이령활지겸고고계정도화고계범위적요구，기우상관함수화적빈솔고계산법부이용흔단적도빈부호취능체도교고적고계정도，괄합재단돌발통신계통중응용。
For short burst communication systems, the position and the number of pilot symbols have a great impact on frequency estimation accuracy and estimation range in time-domain correlation frequency estimation algorithm. So a frequency estimation algorithm with a high frequency estimation accuracy based on the summation of the entire cross correlation is proposed, and its theoretical estimation variance is derived. By analyzing the impact of the pilot position on estimation accuracy and estimation range, a scheme of Variable D-spaced Preamble Middle (VDPM) frame structure is proposed which can choose the distance of pilot blocks according to estimation accuracy and estimation range. Theoretical analysis and simulation results show that the frame structure can satisfy the requirements of frequency estimation range and estimation accuracy, and the estimation algorithm can achieve high estimation accuracy with a few pilot symbols, hence it is suit for short burst communication system.