Sparse multi-carrier index keying OFDM with index separation over correlated sub-carriers
Sparse multi-carrier index keying OFDM with index separation over correlated sub-carriers
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DOI：
10.1109/ictc.2015.7354553
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Y. Ko;Jinho Choi
中科院分区：
文献类型：
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作者：
Y. Ko;Jinho Choi
本文提出了一种用于正交频分复用（OFDM）系统的稀疏多载波索引键控（MCIK）方法，该方法利用稀疏子载波的索引来传输数据，提高了在高相关子载波上的信号检测性能。虽然接收机能够利用OFDM中的预编码来利用功率增益，但是信号检测的灵敏度通常很高，因为在高度色散的环境中没有保持正交性。为了克服这一点，我们专注于开发MCIK，相关性和性能的稀疏性之间的权衡，分析不正确的索引检测高度相关的子载波上施加的错误传播的平均概率。在渐近的情况下，我们能够看到MCIK的稀疏性应该如何设计，以便执行上级的经典OFDM系统。基于这一特点，稀疏MCIK OFDM是一个更好的选择，在高相关子载波的低检测错误。
In this paper, we propose a sparse multi-carrier index keying (MCIK) method for orthogonal frequency division multiplexing (OFDM) system, which uses the indices of sparse sub-carriers to transmit the data, and improve the performance of signal detection in highly correlated sub-carriers. Although a receiver is able to exploit a power gain with precoding in OFDM, the sensitivity of the signal detection is usually high as the orthogonality is not retained in highly dispersive environments. To overcome this, we focus on developing the trade-off between the sparsity of the MCIK, correlation, and performances, analyzing the average probability of the error propagation imposed by incorrect index detection over highly correlated sub-carriers. In asymptotic cases, we are able to see how sparsity of MCIK should be designed in order to perform superior to the classical OFDM system. Based on this feature, sparse MCIK based OFDM is a better choice for low detection errors in highly correlated sub-carriers.