By Erik Dahlman
LTE (Long time period Evolution) is the 3GPP's (3rd iteration Partnership undertaking) new typical and accompanying applied sciences that cellular community operators comparable to ATT, Verizon and TeliaSonera are adopting for his or her networks.
to maneuver to higher-speed networks that could cater to shopper call for for cellular broadband multimedia functions, the 3GPP has constructed the most recent LTE-Advanced (LTE unencumber 10) commonplace, in order to be mounted in December 2010. This booklet makes a speciality of LTE and LTE-Advanced, and offers engineers with genuine perception and realizing into the why and the way of the traditional and its comparable applied sciences. This publication is written via engineers from Ericsson--the world's best telecommunications supplier--who was once seriously serious about the advance of the standard.
- Follow-up to the very profitable 3G Evolution, now concentrating on LTE and LTE complex normal and its accompanying technologies
- Complete and transparent clarification of LTE complicated by means of the people who performed a number one position in its improvement, with a view to allow engineers to speedy seize the most recent 3GPP liberate 10 commonplace and enforce it of their products
- Not a contributed e-book as so much others in this subject are: this publication provides an built-in advent to the applied sciences and the standard
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Extra info for 4G: LTE/LTE-Advanced for Mobile Broadband
B) OFDM transmission over a frequency-selective channel. 3 in the previous chapter, a radio channel is always subject to some degree of frequency selectivity, implying that the channel quality will vary in the frequency domain. In the case of a single wideband carrier, such as a WCDMA carrier, each modulation symbol is transmitted over the entire signal bandwidth. 13a), each modulation symbol will be transmitted both over frequency bands with relatively good quality (relatively high signal strength) and frequency bands with low quality (low signal strength).
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).
10 OFDM AS A USER-MULTIPLEXING AND MULTIPLE-ACCESS SCHEME The discussion has, until now, implicitly assumed that all OFDM subcarriers are transmitted from the same transmitter to a certain receiver, that is: downlink transmission of all subcarriers to a single terminal; uplink transmission of all subcarriers from a single terminal. 17). 17a). 17b).