By Erik Dahlman, Stefan Parkvall, Johan Sköld
Achieve perception into 3GPP’s newest general unencumber eleven on LTE/LTE complicated and the way liberate 12 is developing
To movement to higher-speed networks which may cater to patron call for for cellular broadband multimedia purposes, the 3GPP has built the most recent LTE-Advanced (LTE unencumber 10) common, with the intention to be mounted in December 2010. This ebook specializes in LTE and LTE-Advanced, and gives engineers with actual perception and realizing into the why and the way of the normal and its similar applied sciences. This publication is written by way of engineers from Ericsson--the world's prime telecommunications supplier--who used to be seriously excited by the advance of the traditional.
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Extra info for 4G LTE/LTE-Advanced for Mobile Broadband
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. What subcarrier spacing to use depends on what types of environments the system is to operate in, including such aspects as the maximum expected radio-channel frequency selectivity (maximum expected time dispersion) and the maximum expected rate of channel variations (maximum expected Doppler spread).
L The use of wider transmission and reception bandwidths has an impact on the complexity of the radio equipment, both at the base station and at the terminal. As an example, a wider transmission bandwidth has a direct impact on the transmitter and the receiver sampling rates, and thus on the complexity and power consumption of digital-to-analog and analog-to-digital converters, as well as front-end digital signal processing. RF components are also, in general, more complicated to design and more expensive to produce, the wider the bandwidth they have to handle.
36 MHz, where Δf 15 kHz is the LTE subcarrier spacing. It is important to understand that IDFT/IFFT-based implementation of an OFDM modulator, and even more so the exact IDFT/IFFT size, are just transmitter-implementation choices and not something that would be mandated by any radio-access specification. 3. Also, nothing prevents the use of a larger IFFT size, for example a size-2048 IFFT size, even in the case of a smaller number of OFDM subcarriers. • 3 From now on the index m on the modulation symbols, indicating the OFDM symbol number, will be ignored unless especially needed.