通信工程文献翻译——1介绍

随着3GPP LTE标准化的快速发展，新开发的算法和系统模型是非常需要验证的。LTE系统级仿真，是一个基于统计的仿真环境，有助于研究系统的性能和评估新的算法。

差错控制编码（ECC）首先被介绍应用于计算机网络，可以帮助提高效率。在数字通信中，常用的两种差错控制编码包括正向纠错（FEC）和自动重复请求（ARQ）。

在目前的LTE系统，混合ARQ（HARQ）使用CC（追赶合并）或者IR（递增冗余）两种方式以提高效率和可靠性。但是，当信噪比（SNR）较高时，HARQ将不会有什么帮助。人们总是会考虑HARQ的附属方案在通信系统中的信噪比的敏感性。

从LTE系统级的角度出发，研究者关注的是算法产生的总影响。众所周知的是，仿真将花费大量的时间在其大量的计算和使用的物理内存上，所以一个有效的数据结构对有大量的计算来说是非常重要的。

在这一章中，我们将使用MATLAB 2010A，设计了一个新的有效的数据结构来实现追赶合并和递增冗余，这种设计更有效也更容易实现。这个模拟分析的结果也用来对追赶合并和递增冗余进行比较。

本章组织如下：第2部分介绍了CC-HARQ和IR-HARQ两种类型的基本概念，包括LTE系统级仿真的一些简介。然后，我们的系统级仿真的HARQ数据结构会被提出来。第3部分给出了仿真结果和必要的分析。第4部分给出结论。

2系统模型

基于LTE系统级仿真技术的MATLAB是研究HARQ性能的一种简单有效的方法。在这一部分中，我们将首先介绍模拟器的结构以及CC-HARQ和IR-HARQ的原理，并展示我们设计来实现HARQ的数据结构及其优点。

2.1 LTE系统级仿真

LTE系统级仿真是一种基于LTE标准和提案的大平台。在我们的设计中......

1 Introduction

With the rapid development of 3GPP LTE standardization, newly developed

algorithms and system models are in great need of verification. The LTE systemlevel simulation [1] is a large statistical-based simulation environment which can help study system performance and evaluate new algorithms.

Error Control Coding (ECC) is firstly introduced in computer networks [2], which can help increase efficiency. In digital communications, the two common ECC methods are Forward Error Correction (FEC) and Automatic Repeat Request (ARQ).

In current LTE systems, Hybrid-ARQ (HARQ) using CC (Chase-Combine) or IR (Incremental Redundancy) is performed to increase efficiency and reliability.

But when the signal-to-noise ratio (SNR) is high, HARQ will do little to help.People always consider HARQ an affiliated scheme in communication systems for its sensitivity in SNR.

In LTE system level of view, researchers focus on the total influences of given algorithms. It is well known that the simulation will cost much time for its large amount of calculation and use of physical memory. An effective data structure is very important in large amount of calculations.

In this chapter, we design a new and effective data structure to implement CC and IR HARQ using Matlab 2010a, which is more effective and easy to achieve. An analysis of simulation result is also given to make a comparison of CC-HARQ and IR-HARQ.

This chapter is organized as follows. Part 2 introduces the basic concepts of CC-HARQ and IR-HARQ, including some brief introduction of LTE system-level simulation. Then, the data structure of HARQ in our system-level simulation is presented. In part 3, simulation result and necessary analysis are given. Conclusions are given in part 4.

2 System Model

The Matlab-based LTE system-level simulator is an easy and effective way to study HARQ performance. In this part, we will first introduce the structure of the simulator and the principles of CC-HARQ and IR-HARQ, and then we show the data structure we designed to implement HARQ and its......