【資料名稱】：Overview of the 3GPP Long Term Evolution Physical Layer

【資料作者】：Jim Zyren

【資料日期】：2007/7

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

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 50 megabits per second (Mbps) and a downlink speed of up to 100 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 transmisson.

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 22
5 References 23
6 Acronyms and Abbreviations 24

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