PCMA系统中干扰信号的频偏与时延联合估计
发布时间：2019-05-03 19:31
【摘要】：针对合作接收的高阶调制成对载波多址(PCMA,paired carrier multiple access)信号,提出一种频偏与时延联合估计的算法。算法利用本地存储的序列样本作为辅助数据,与混合信号求相关得到目标函数,采用二维搜索的方法估计频偏和时延。通过设置联合估计的门限值,大大降低算法的计算量。推导干扰信号频偏与时延估计的修正的克拉美罗界(MCRB,modified Cramer-Rao bound),为算法性能评价提供理论依据。仿真结果表明,8PSK调制方式下频偏估计算法与已有算法性能相当,但复杂度降低了23。
[Abstract]:This paper presents a joint frequency offset and delay estimation algorithm for cooperative received high-order modulation pair carrier multiple access (PCMA,paired carrier multiple access) signals. The algorithm uses locally stored sequence samples as auxiliary data, and gets the objective function by correlation with mixed signal. The two-dimensional search method is used to estimate the frequency offset and time delay. By setting the threshold of joint estimation, the computational complexity of the algorithm is greatly reduced. The modified Keramelot bound of interference signal frequency offset and time delay estimation (MCRB,modified Cramer-Rao bound),) is derived to provide a theoretical basis for the performance evaluation of the algorithm. The simulation results show that the performance of the frequency offset estimation algorithm for 8PSK modulation is similar to that of the existing algorithms, but the complexity is reduced by 23. 5%.
【作者单位】： 解放军信息工程大学信息系统工程学院;
【基金】：国家自然科学基金资助项目(No.61401511)~~
【分类号】：TN911.23
[Abstract]:This paper presents a joint frequency offset and delay estimation algorithm for cooperative received high-order modulation pair carrier multiple access (PCMA,paired carrier multiple access) signals. The algorithm uses locally stored sequence samples as auxiliary data, and gets the objective function by correlation with mixed signal. The two-dimensional search method is used to estimate the frequency offset and time delay. By setting the threshold of joint estimation, the computational complexity of the algorithm is greatly reduced. The modified Keramelot bound of interference signal frequency offset and time delay estimation (MCRB,modified Cramer-Rao bound),) is derived to provide a theoretical basis for the performance evaluation of the algorithm. The simulation results show that the performance of the frequency offset estimation algorithm for 8PSK modulation is similar to that of the existing algorithms, but the complexity is reduced by 23. 5%.
【作者单位】： 解放军信息工程大学信息系统工程学院;
【基金】：国家自然科学基金资助项目(No.61401511)~~
【分类号】：TN911.23
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