In this letter, proactive eavesdropping of an orthogonal frequency division multiplexing (OFDM)-based bidirectional point-to-point suspicious communication link is studied. The problem of joint successive interference cancelation (SIC) decoding ordering and jamming power allocation at the monitor for maximizing the weighted sum eavesdropping rate is formulated as mixed-integer nonlinear programming and then transformed to more tractable zero-one integer programming. A heuristic suboptimal algorithm and an optimal algorithm based on the branch-and-bound method are proposed. Simulation results show the advantageous of the proposed algorithms compared to the benchmarks, and also show that both algorithms are low-complex, and the suboptimal algorithm has further lower complexity and achieves almost the same performance as the optimal algorithm.

中文翻译：

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基于 OFDM 的双向可疑通信信道的主动窃听

在这封信中，研究了基于正交频分复用 (OFDM) 的双向点对点可疑通信链路的主动窃听。在监视器上联合连续干扰消除 (SIC) 解码排序和干扰功率分配以最大化加权和窃听率的问题被公式化为混合整数非线性规划，然后转换为更易于处理的零一整数规划。提出了一种启发式次优算法和一种基于分支定界法的最优算法。仿真结果表明，与基准算法相比，所提出的算法具有优势，同时也表明两种算法的复杂度都较低，次优算法的复杂度进一步降低，实现了与最优算法几乎相同的性能。