凿孔

本文主要讨论自适应调制与编码系统（AdaptiveModulationandCodingsystem）的原理，介绍AMCS实现的几个关键技术，包括RCPT（速率适配凿孔turbo）码、高阶调制、H-ARQ和MIMO（多输入多输出）系统。

The principle of adaptive modulation and coding system ( AMCS ) is discussed . The key techniques in AMCS are introduced , including RCPT ( Rate compatible puncture turbo ) code , high order modulation , H-ARQ and MIMO ( multiple input and multiple output ) system .

潜孔钻机以其特有的凿孔特点占据了很大一块市场。

The application of down-the-hole drill in tunnel ;

全自动复凿孔机交换制

Fully automatic reperforator switching hydraulic automatic control system

凿孔扩大用带齿的尖的工具钻或扩大（孔）

To shape or enlarge ( a hole ) with a tapered , serrated tool .

部分为凿孔表面的反射器天线等效反射系数及噪温的计算

Calculation of Equivalent Reflection Coefficient and Noise Temperature for Reflector Antenna with Partially Perforated Surface

能以凿孔形式记录信息的卡片。

A card on which data can be recorded in the form of punched holes .

一种在金属冷加工中起辅助作用且带有凿孔、凹槽的铁块。

An iron block cut with holes and grooves to assist in the cold-working of metal .

以管道中的流体为声压信号的传输介质，传感器可灵敏检测到钻孔，焊管，凿孔等特征声波信号。在大港油田集油站现场实验取得了良好效果。

The sensor can prevent actively from manmade damage incidents , it achieved good results through experiments in collection stations of Dagang oil field .

针对基于距离谱的凿孔卷积码优化设计问题，提出了一种高效的凿孔卷积码距离谱计算方法。

For the optimum design problem of punctured convolutional codes based on the distance spectrum , an efficient computing method of the distance spectrum for punctured convolutional codes is proposed .

采用等效馈源及凿孔表面的反射与传输系数导出了部分为凿孔表面的反射器天线等效反射系数及天线噪声温度的计算公式。

The calculation formula of the equivalent reflection coefficient and noise temperature of reflector antenna with the partially perforated surface are derived by the reflection and transmission coefficients and the equivalent feed .

利用卷积码状态图和凿孔码凿孔图样构造一个长度为凿孔周期的状态转移矩阵序列，并利用状态转移矩阵序列的乘积计算传输函数和距离谱。

A state transition matrix sequence is constructed with the state graph and punctured pattern , and the product of the matrix sequence is used to compute the transfer function and distance spectrum ;

内燃凿岩机主要用于岩石凿孔作业，也可作为破碎机和夯实机的冲击作业，但需要将机头拆下更换少许机件才能实现。

A diesel rock driller is mainly applied to drilling , but sometimes it can takes the place of a crusher or a compactor in impaction work when removed the head and replaced the parts .