Multidimensional parallel combinatory transform domain communication system
Multidimensional parallel combinatory transform domain communication system
复制标题
多维并行组合变换域通信系统
DOI：
10.1002/dac.3249
复制
发表时间：
2017-07-25
影响因子：
2.1
通讯作者：
Tao, Ran
中科院分区：
文献类型：
--
作者：
Chang, Cheng;Huan, Hao;Tao, Ran
变换域通信系统是一种动态产生干扰正交波形的自适应抗干扰系统。作为一种扩频系统，其低频谱效率限制了潜在的实际应用。在TDCS中，循环码移键控是一种正交调制，其符号可以看作是不同维度上的标量。然而，星座图受到信号时间带宽积的限制。在本研究中，扩展星座被证明是一种有效的方法，以提高频谱效率。多维向量的组合在数学上被设计为在最小正交性损伤的情况下增加标量的多样性。在此基础上，提出了一种高效的调制方案，即多维并行组合变换域通信系统，其基本调制符号可以用一系列循环码移键控符号与相移键控调制的组合来表示。与现有方法相比，多维并行组合变换域通信系统可以获得更高的频谱效率。误码性能也得到了不同程度的改善。在加性白色高斯噪声和典型多径衰落信道下，推导了该方法的理论频谱效率和误比特率。对不同频谱条件和信道估计方法下的系统进行了仿真分析，验证了该方法的实用性。
Transform domain communication system is an adaptive anti-interference system that can dynamically generate interference-orthogonal waveforms. As a spread spectrum system, its low spectrum efficiency limits potential practical applications. In TDCS, cyclic code shift keying is an orthogonal modulation, whose symbols can be regarded as scalars in different dimensions. However, the constellation is restricted by signal time-bandwidth product. In this study, extending constellation is proven to be a valid approach to improve spectrum efficiency. The combinatory of multidimensional vectors is designed mathematically to increase the variety of the scalars with the minimum orthogonality damage. On the basis of the design, an efficient modulation scheme, namely, multidimensional parallel combinatory transform domain communication system, is proposed, whose fundamental modulation symbols can be represented by the combinatory of a series of cyclic code shift keying symbols with phase shift keying modulation. Compared with the existing methods, multidimensional parallel combinatory transform domain communication system can achieve a considerably higher spectrum efficiency. The bit error rate performance is also improved to various extents. Theoretical spectrum efficiency and bit error rate of the proposed method are derived for additive white Gaussian noise and typical multipath fading channels. System with different spectral conditions and channel estimation methods is also simulated and analyzed to confirm the practical usability.