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4G: LTE/LTE-Advanced for Mobile Broadband by Johan Skold, Stefan Parkvall, Erik Dahlman

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Chapter 9

Physical Transmission Resources

In Chapter 8, the overall LTE architecture was discussed, including an overview of the different protocol layers. Prior to discussing the detailed LTE downlink and uplink transmission schemes, a description of the basic time- and frequency-domain structure of LTE will be provided in this chapter.

9.1 Overall Time–Frequency Structure

OFDM is the basic transmission scheme for both the downlink and uplink transmission directions in LTE although, for the uplink, specific means are taken to reduce the cubic metric of the transmitted signal, thereby allowing for improved efficiency for the terminal transmitter power amplifier. Thus, for data transmission, DFT precoding is applied before OFDM modulation, leading ...

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