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 transmission.
Contents:-
1. Introduction
- LTE Design Goals
2. LTE Basic Concepts
- Single Carrier Modulation and Channel Equalization
- OFDM adn OFDMA
- MIMO and MRC
- SC-FDMA
3. LTE Physical Layer
- Modulation Parameters
- Downlink Multiplexing
- Physical Channels
- Transport Channels
- Mapping Downlink Physical Channels to Transport Channels
- Downlink Channel Coding
4. Conclusions
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