代码优化是提高Java 虚拟机执行速度的重要手段之一。本文提出了一种基于预处理的代码优化方法。预 处理模块与嵌入式Java 虚拟机并行工作,为其标注基本块、循环等结构,并通过数据流分析收集各方法、各变量 的引用次数。Java 虚拟机利用预处理模块所收集的信息,判定各块程序的执行频率,对高频部分进行内联、寄存 器分配等优化处理。本文还讨论了Java 虚拟机实现中的若干事项。-Code optimization is to improve an important means of th

OFDM is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels.

OFDM is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels. Orthogona