lte-a报告译文

CARRIER AGGREGATION FOR LTE-ADVANCED:

UPLINK MULTIPLE ACCESS AND

TRANSMISSION ENHANCEMENT FEATURES

LTE-Advanced的载波聚合：

上行多址接入和

传输增强功能

YUNRUI, CHINESE ACADEMY OF SCIENCES AND STATE KEY LAB OF ISN

PENG CHENG, SHANGHAI JIAO TONG UNIVERSITY

MINGQI LI, CHINESE ACADEMY OF SCIENCES

Q.T. ZHANG, NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS

MOHSEN GUIZANI, QATAR UNIVERSITY

云瑞，中国科学院和ISN国家重点实验室

上海交通大学程鹏

李明启，中国科学院科学

Q.T.张，南京邮电大学

穆赫辛GUIZANI，卡塔尔大学

ABSTRACT

Multiple access and transmission enhancement in support of carrier aggregation techniques has

been actively studied in the 3GPP LTEAdvanced standardization process of the nextgeneration

mobile broadband communication systems. By means of carrier aggregation, users can access a

total bandwidth of up to 100 MHz in order to meet the IMT-Advanced requirements. This article

first introduces and compares several

uplink multiple access schemes in LTE-Advanced standard. Technical challenges arising from the

use of carrier aggregation is then addressed, with focus on reference signals design for uplink

transmission. Meanwhile, various candidate options are summarized and compared in terms of

their system performance, computational complexity, and design flexibility. The article further

proceeds to investigate the link performance with carrier aggregation, taking into account the

presence of frequency offset and fast fading in the uplink channel. Numerical results are also

presented, which indicate that advanced signal processing algorithms should be further studied

and optimized to ensure reliable operation of the 3GPP LTE-Advanced in high mobility

摘要

LTEAdvanced在3GPP标准化的下一代移动宽带通信系统的过程中，多个接入和传输增强，以支持载波聚合技术已被积极地研究。通过载波聚合，用户可以访问的总带宽高达100 MHz ，以满足IMT-Advanced的要求。本文首先介绍和比较了几种

上行多址接入方案在LTE -Advanced的标准。然后使用载波聚合技术所带来的挑战，重点参考信号设计用于上行传输。同时，各种候选方案进行了总结和比较他们的系统的性能，计算复杂性，和设计灵活性。的文章进一步进行调查载波聚合的链路性能，同时考虑到存在的频率偏移和上行链路中的信道快衰落。数值结果还提出，这表明，先进的信号处理算法，应进一步研究和优化，以确保可靠运行的3GPP LTE -Advanced的高迁移率

INTRODUCTION

To meet the increasing demand for wireless broadband services from fast-growing mobile users,

the International Telecommunication Union (ITU) has endeavored in the development of the

terrestrial radio interface recommendations for the next-generation mobile communication

systems, ending up with a technical standard usually known as International Mobile Telecommunications-Advanced (IMTAdvanced). As indicated in the resulting technical

specifications [1], the key feature of IMT-Advanced systems is that their enhanced peak data

rates should suffice to support advanced services and applications, reaching up to 1 Gb/s in static

environment and 100 Mb/s in high-speed mobile environments.

简介

为了满足快速增长的移动用户的无线宽带服务的需求不断增加，国际电信联盟（ITU）一直致力地面无线电接口建议在发展新一代移动通信系统，结束了与通常的技术标准被称为国际移动通信高级（IMTAdvanced）。如上技术规范[1]，IMT-Advanced系统的主要特点是其增强的峰值数据率应足以支持先进的服务和应用，达到1 Gb / s的静态环境和100 Mb / s的在高速移动环境。

The efforts of the ITU receive active responses from the wireless sector. Shortly after the

release of [1], the Third Generation Partnership Project (3GPP) completed its Long Term Evolution

(LTE) standards family Release 8 (Rel. 8) in 2009, which defines and specifies new functionalities,

characteristics and key technologies for beyond 3G (B3G) mobile systems. Further enhancement

over the LTE is currently under investigation in the LTE-Advanced (LTE-A) standardization process,

aiming to meet, or even exceed, the IMT-Advanced requirements on data rates, transmission

bandwidth and mobility [2] while preserving backward compatibility with LTE systems. For

backward compatibility and flexible bandwidth allocation to different users, carrier aggregation

(CA) has been proposed as a key technology for LTE-A whereby multiple component carriers (CC)

can be flexibly aggregated to support varying high data rates and wide bandwidth on a demand

basis. Each CC has the same structure as that used in LTE Rel. 8, implying that CA does not require

notable changes in the LTE physical layer structure, as opposed to many other candidate

schemes.

国际电联的努力收到来自无线部门的积极响应。不久后，

释放[1 ] ，第三代合作伙伴计划（3GPP）完成了其长期演进（ LTE ）标准的家庭第8版（相对8）在2009年，它定义并指定新的功能，特点和关键技术，超越3G （ B3G ）移动通信系统。进一步加强在LTE （ LTE-A ）的LTE - Advanced的标准化进程，目前正在调查中，旨在满足，甚至超过IMT-Advanced的要求的数据传输速率，传输带宽和移动性[2 ] ，同时保持向后兼容性LTE系统。为了向后的兼容性和灵活的带宽分配给不同的用户，载波聚合（ CA ）已建议作为一项关键技术， LTE-A的多个分量载波（ CC ）可以灵活合并，以支持不同的高数据传输速率和高带宽需求基础。每个CC具有相同的结构，用于在LTE相对。 8 ，这意味着该CA不要求在LTE的物理层结构的显着的变化，相对于许多其他的候选方案。

Clearly, carrier aggregation enables a flexible frequency-bandwidth allocation among users of

varying data rates which, when used along with multi-carrier modulation for backward

compatibility with LTE Rel. 8, constitutes a basic framework to support the physical layer of LTE-A.