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中文摘要：
频偏同步是正交频分复用系统中的一项关键技术。论文提出了一种通过计算PN序列分布的空子载波功率值进行频偏估计的方法，克服了在传统空子载波法中，受信道频域响应的零点影响所导致的频偏估计错误。该方法利用了PN序列良好的相关性。整数倍频偏部分采取子载波位置序列互相关计算，小数倍频偏采用最陡下降法迭代计算。所计算的代价函数不会产生多个最小值，同时不会在全频域内搜索，大幅降低了运算量。仿真实验表明：与基于循环前缀的最大似然估计相比，提高了同步精度和频偏估计范围，验证了所提方法的有效性。
英文摘要：
Frequency offset synchronization is one of key apartment of orthogonal frequency division multiplexing technology. This paper analyzed the relationship between single channel frequency response zeros and null-subcarriers. A novel frequency offset estimation algorithm was proposed. It is based on null subcarriers distributed as Pseudo Noise （ PN ） sequences and overcomes the error induced by channel frequency response zeros in traditional null-subcarriers methods. This method makes great use of good correlation properties of PN sequences. Integer offset estimation is achieved by subcarriers position sequence cross-correlation calculation; meanwhile fraction offset estimation computation implemented by iterative steepest descent algorithm. Cost function calculated by this method will not produce more than the minimum, not the whole frequency domain search, dramatically reducing the amount of computation. According to the simulation results, this method improved estimation accuracy and estimation scope compared with maximum likelihood estimation algorithms based on cycle prefix, to verify its validity.
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同项目期刊论文
An Adaptive ISAR-Imaging-Considered Task Scheduling Algorithm for Multi-Function Phased Array Radars
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