Recently, a number of projected successive interference cancellation (PSIC) and projected parallel interference cancellation (PPIC) structures, which make use of the non-negativity constraint in incoherent OCDMA systems to enhance their performance, have been proposed and studied in (Seleem et al. in IEEE Commun Lett 16:1721–1724, 2012). Although these structures showed improved performance, they still inherit the same shortcomings of the conventional SIC/PIC structures such as large detection delay for the SIC detector and slow convergence speed for the PIC detector. In this work, we propose a new projected block-wise SIC (PBSIC) structure that not only exploits the non-negativity constraint but also overcomes the drawbacks associated with the conventional SIC/PIC structures. In particular, it largely reduces the detection delay of the PSIC detector of (Seleem et al. in IEEE Commun Lett 16:1721–1724, 2012), while it enjoys the same fast convergence speed. Two approaches for decreasing the computational complexity of the proposed detector are investigated. Simulation results are in total agreement with our theoretical findings.

最近，许多利用非相干 OCDMA 系统中的非负约束来增强其性能的投影连续干扰消除 (PSIC) 和投影并行干扰消除 (PPIC) 结构已经被提出并研究 (Seleem et al . 在 IEEE Commun Lett 16:1721–1724, 2012)。尽管这些结构表现出改进的性能，但它们仍然继承了传统 SIC/PIC 结构的缺点，例如 SIC 检测器的检测延迟大和 PIC 检测器的收敛速度慢。在这项工作中，我们提出了一种新的投影块状 SIC (PBSIC) 结构，它不仅利用了非负约束，而且还克服了与传统 SIC/PIC 结构相关的缺点。特别是，它大大降低了（Seleem 等人在 IEEE Commun Lett 16:1721–1724, 2012 中）的 PSIC 检测器的检测延迟，同时它享有相同的快速收敛速度。研究了降低所提出的检测器的计算复杂度的两种方法。模拟结果与我们的理论发现完全一致。