OFDM with Generalized Cascade Index Modulation for Secure Communications  

作　　者：Hu Zeng Jin Xiaopin Yao Yudong Chen Fangjiong Wan Dehuan Liu Yun 

机构地区：[1]College of Information Science and Technology,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China [2]College of Information Engineering,China Jiliang University,Hangzhou 310018,China [3]Department Electrical and Computer Engineering Stevens Institute of Technology,Hoboken,NJ 07030,USA [4]School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510641,China [5]Center for Data Science and Artificial Intelligence,Guangdong University of Finance,Guangzhou 510521,China

出　　处：《China Communications》2024年第10期210-225,共16页中国通信（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 61971149, 62071504, 62271208);in part by the Special Projects in Key Fields for General Universities of Guangdong Province (No. 2020ZDZX3025, 2021ZDZX056);in part by the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515011657);in part by the Featured Innovation Projects of Guangdong Province of China (No. 2021KTSCX049)。

摘　　要：Cascade index modulation(CIM) is a recently proposed improvement of orthogonal frequency division multiplexing with index modulation(OFDM-IM) and achieves better error performance.In CIM, at least two different IM operations construct a super IM operation or achieve new functionality. First, we propose a OFDM with generalized CIM(OFDM-GCIM) scheme to achieve a joint IM of subcarrier selection and multiple-mode(MM)permutations by using a multilevel digital algorithm.Then, two schemes, called double CIM(D-CIM) and multiple-layer CIM(M-CIM), are proposed for secure communication, which combine new IM operation for disrupting the original order of bits and symbols with conventional OFDM-IM, to protect the legitimate users from eavesdropping in the wireless communications. A subcarrier-wise maximum likelihood(ML) detector and a low complexity log-likelihood ratio(LLR) detector are proposed for the legitimate users. A tight upper bound on the bit error rate(BER) of the proposed OFDM-GCIM, D-CIM and MCIM at the legitimate users are derived in closed form by employing the ML criteria detection. Computer simulations and numerical results show that the proposed OFDM-GCIM achieves superior error performance than OFDM-IM, and the error performance at the eavesdroppers demonstrates the security of D-CIM and M-CIM.

关 键 词：cascade index modulation low-complexity detector maximum likelihood OFDM physical layer security 

分 类 号：TN929.53[电子电信—通信与信息系统]