By Erik Dahlman, Stefan Parkvall, Johan Sköld
Achieve perception into 3GPP’s most modern general liberate eleven on LTE/LTE complex and the way unlock 12 is developing
To stream to higher-speed networks which can cater to client call for for cellular broadband multimedia functions, the 3GPP has built the newest LTE-Advanced (LTE free up 10) ordinary, as a way to be fastened in December 2010. This e-book makes a speciality of LTE and LTE-Advanced, and gives engineers with genuine perception and figuring out into the why and the way of the traditional and its comparable applied sciences. This e-book is written by way of engineers from Ericsson--the world's major telecommunications supplier--who was once seriously considering the advance of the normal.
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Additional resources for 4G LTE/LTE-Advanced for Mobile Broadband
5 FREQUENCY-DOMAIN MODEL OF OFDM TRANSMISSION Assuming a sufficiently large cyclic prefix, the linear convolution of a time-dispersive radio channel will appear as a circular convolution during the demodulator integration interval Tu. 11 Frequency-domain model of OFDM transmission/ reception with “one-tap equalization” at the receiver. the frequency-domain channel taps H0, …, H N c Ϫ1 can be directly derived from the channel impulse response. 10 is the transmitted modulation symbol ak scaled and phase rotated by the complex frequency-domain channel tap Hk and impaired by noise nk.
4G LTE/LTE-Advanced for Mobile Broadband. © 2011 Erik Dahlman, Stefan Parkvall & Johan Sköld. Published by Elsevier Ltd. All rights reserved. 1 (a) Per-subcarrier pulse shape. (b) Spectrum for basic OFDM transmission. 2 OFDM subcarrier spacing. that, during each OFDM symbol interval, Nc modulation symbols are transmitted in parallel. The modulation symbols can be from any modulation alphabet, such as QPSK, 16QAM, or 64QAM. The number of OFDM subcarriers can range from less than hundred to several thousand, with the subcarrier spacing ranging from several hundred kHz down to a few kHz.
Multiple receive antennas can be applied at the base station (that is, for the uplink) or at the terminal (that is, for the downlink). By proper combination of the signals received at the different antennas, the signalto-noise ratio after the antenna combination can be increased in proportion to the number of receive antennas, thereby allowing for higher data rates for a given transmitter/receiver distance. Multiple antennas can also be applied at the transmitter side, typically at the base station, and be used to focus a given total transmit power in the direction of the receiver – that is, toward the target terminal.
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