GNSS data demodulation over fading environments: Antipodal and M ‐ary CSK modulations
GNSS data demodulation over fading environments: Antipodal and M ‐ary CSK modulations
复制标题
DOI：
10.1049/rsn2.12017
复制
发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
L. Ortega;J. Vilà‐Valls;C. Poulliat;P. Closas
中科院分区：
文献类型：
--
作者：
L. Ortega;J. Vilà‐Valls;C. Poulliat;P. Closas
本文研究了新的策略，以计算准确的低复杂度对数似然比（LLR）值的基础上贝叶斯公式在不相关的衰落信道下的对跖和码移键控调制时，没有信道状态信息（CSI）在接收机。然后，这些LLR值被用作上一代全球导航卫星系统信号的数据解码过程中使用的现代纠错方案的输入。基于最大可达速率的理论分析，提出了不同的方法，以评估相对于最佳CSI信道的性能下降。最后给出了误帧率仿真结果，验证了所提出的LLR近似方法的适当性能。
This article investigates new strategies to compute accurate low ‐ complexity log ‐ likelihood ratio (LLR) values based on the Bayesian formulation under uncorrelated fading channels for both antipodal and code shift keying modulations when no channel state information (CSI) is available at the receiver. These LLR values are then used as input to modern error ‐ correcting schemes used in the data decoding process of last ‐ generation Global Navigation Satellite System signals. Theoretical analysis based on the maximum achievable rate is presented for the different methods in order to evaluate the performance degradation with respect to the optimal CSI channel. Finally, the frame error rate simulation results are shown, validating the appropriate performance of the proposed LLR approximation methods.