3GPPEVOLUTIONWP - White Paper Overview of the 3GPP Long...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Document Number: 3GPPEVOLUTIONWP Rev 0 07/2007 White Paper Overview of the 3GPP Long Term Evolution Physical Layer Jim Zyren [email protected] Dr. Wes McCoy, Technical Editor
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Overview Long Term Evolution (LTE) is the next step forward in cellular 3G services. Expected in the 2008 time frame, LTE is a 3GPP standard that provides for an uplink speed of up to 5 0 megabits per second (Mbps) and a downlink speed of up to 10 0 Mbps. LTE will bring many technical benefits to cellular networks. Bandwidth will be scalable from 1.25 MHz to 20 MHz. This will suit the needs of different network operators that have different bandwidth allocations, and also allow operators to provide different services based on spectrum. LTE is also expected to improve spectral efficiency in 3G networks, allowing carriers to provide more data and voice services over a given bandwidth. This technical white paper provides an overview of the LTE physical layer (PHY), including technologies that are new to cellular such as Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) data transmission. Contents 1 Introduction 1 1.1 LTE Design Goals 1 2 LTE Basic Concepts 2 2.1 Single Carrier Modulation and Channel Equalization 2 2.2 OFDM 3 2.2.1 Disadvantages of OFDM 5 2.3 OFDMA 7 2.3.1 Comparison of OFDMA with Packet- Oriented Protocols 7 2.3.2 OFDMA and the LTE Generic Frame Structure 8 2.4 MIMO and MRC 10 2.5 SC-FDMA 13 3 LTE Physical Layer 14 3.1 Downlink 15 3.1.1 Modulation Parameters 15 3.1.2 Downlink Multiplexing 16 3.1.3 Physical Channels 16 3.1.4 Physical Signals 17 3.1.5 Transport Channels 18 3.1.6 Mapping Downlink Physical Channels to Transport Channels 19 3.1.7 Downlink Channel Coding 19 3.2 Uplink 20 3.2.1 Modulation Parameters 20 3.2.2 Multiplexing 20 3.2.3 Uplink Physical Channels 20 3.2.4 Uplink Physical Signals 21 3.2.5 Uplink Transport Channels 21 3.2.6 Mapping Uplink Physical Channels to Transport Channels 22 3.2.7 Coding 22 3.3 MB-SFN 22 4 Conclusions 2 2 5 References 2 3 6 Acronyms and Abbreviations 24
Background image of page 2
Freescale Semiconductor, Inc. Overview of the 3GPP Long Term Evolution Physical Layer 1 1 Introduction The 3GPP Long Term Evolution (LTE) represents a major advance in cellular technology. LTE is designed to meet carrier needs for high-speed data and media transport as well as high-capacity voice support well into the next decade. It encompasses high-speed data, multimedia unicast and multimedia broadcast services. Although technical specifications are not yet finalized, significant details are emerging. This paper focuses on the LTE physical layer (PHY). The LTE PHY is a highly efficient means of conveying both data and control information between an enhanced base station (eNodeB) and mobile user equipment (UE). The LTE PHY employs some advanced technologies that are new to cellular applications. These include Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) data transmission. In addition, the LTE PHY uses Orthogonal Frequency Division Multiple Access (OFDMA) on the downlink (DL) and Single Carrier – Frequency Division Multiple Access (SC-FDMA) on the uplink (UL).
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 27

3GPPEVOLUTIONWP - White Paper Overview of the 3GPP Long...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online