Overlapped x domain multiplexing(OVXDM) is a promising encoding technique to obtain high spectral efficiency by utilizing inter-symbol interference(ISI) intelligently. However, the computational complexity of maximum ...Overlapped x domain multiplexing(OVXDM) is a promising encoding technique to obtain high spectral efficiency by utilizing inter-symbol interference(ISI) intelligently. However, the computational complexity of maximum likelihood sequence detection(MLSD) increases exponentially with the growth of spectral efficiency in OVXDM, which is unbearable for practical implementations. In this paper, based on a novel path metric associating adjacent symbols, we propose a multi-bit sliding stack decoding(Multi-Bit SSD) algorithm to achieve multiple-bit decoding simultaneously in OVXDM. Theoretical analysis is provided for the algorithm, which indicates the relationship between the performance and parameters including multiplexing waveform, overlapping fold and sliding window size. Simulation results show that the proposed algorithm can achieve better decoding performance and higher spectral efficiency than conventional fast decoding algorithms.展开更多
针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第...针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第一个码元起始点位置,计算相应的重构信号与接收信号的似然度,据此实现短猝发信号码元个数的准确估计并恢复符号序列。应用二进制方波信号对盲解调算法进行仿真,仿真结果表明,当短猝发信号码元个数>8个,信噪比>10 d B时,码元个数估计正确率能够达到95%以上,解调效果良好。展开更多
基金supported by the Fundamental Research Funds for the Central Universities under grant 2016XD-01
文摘Overlapped x domain multiplexing(OVXDM) is a promising encoding technique to obtain high spectral efficiency by utilizing inter-symbol interference(ISI) intelligently. However, the computational complexity of maximum likelihood sequence detection(MLSD) increases exponentially with the growth of spectral efficiency in OVXDM, which is unbearable for practical implementations. In this paper, based on a novel path metric associating adjacent symbols, we propose a multi-bit sliding stack decoding(Multi-Bit SSD) algorithm to achieve multiple-bit decoding simultaneously in OVXDM. Theoretical analysis is provided for the algorithm, which indicates the relationship between the performance and parameters including multiplexing waveform, overlapping fold and sliding window size. Simulation results show that the proposed algorithm can achieve better decoding performance and higher spectral efficiency than conventional fast decoding algorithms.
文摘针对非协作通信中短猝发信号准确接收的需求,在对短猝发信号进行建模的基础上,提出了一种基于极大似然准则的短猝发信号盲解调算法。根据极大似然准则,对前期信号参数估计得到的可能码元个数集合进行搜索处理,获取不同码元个数对应的第一个码元起始点位置,计算相应的重构信号与接收信号的似然度,据此实现短猝发信号码元个数的准确估计并恢复符号序列。应用二进制方波信号对盲解调算法进行仿真,仿真结果表明,当短猝发信号码元个数>8个,信噪比>10 d B时,码元个数估计正确率能够达到95%以上,解调效果良好。
