By Erik Dahlman
LTE (Long time period Evolution) is the 3GPP's (3rd new release Partnership undertaking) new ordinary and accompanying applied sciences that cellular community operators akin to ATT, Verizon and TeliaSonera are adopting for his or her networks.
to maneuver to higher-speed networks which could cater to purchaser call for for cellular broadband multimedia purposes, the 3GPP has built the most recent LTE-Advanced (LTE unencumber 10) general, in an effort to be fastened in December 2010. This e-book makes a speciality of LTE and LTE-Advanced, and offers engineers with genuine perception and realizing into the why and the way of the normal and its comparable applied sciences. This e-book is written by way of engineers from Ericsson--the world's major telecommunications supplier--who used to be seriously fascinated about the improvement of the standard.
- Follow-up to the very winning 3G Evolution, now concentrating on LTE and LTE complex commonplace and its accompanying technologies
- Complete and transparent rationalization of LTE complicated by means of the people who performed a number one position in its improvement, on the way to let engineers to speedy take hold of the newest 3GPP unencumber 10 typical and enforce it of their products
- Not a contributed e-book as so much others in this subject are: this booklet offers an built-in creation to the applied sciences and the standard
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Additional info for 4G: LTE/LTE-Advanced for Mobile Broadband
As a consequence, the power-amplifier efficiency will be reduced, leading to increased power consumption. In addition, there will be a negative impact on the power-amplifier cost. Alternatively, the average transmit power must be reduced, implying a reduced range for a given data rate. High power-amplifier efficiency is especially important for the terminal – that is, in the uplink direction – due to the importance of low mobile-terminal power consumption and cost. For the base station, high power-amplifier efficiency, although far from irrelevant, is still somewhat less important.
1a. 1b. 2). 3. It consists of a bank of Nc complex modulators, where each modulator corresponds to one OFDM subcarrier. 1) k 0 where xk(t) is the kth modulated subcarrier with frequency fk k Δf and ak( m ) is the, generally complex, modulation symbol applied to the kth subcarrier during the mth OFDM symbol interval – that is, during the time interval mTu t (m 1)Tu. 4. 4G LTE/LTE-Advanced for Mobile Broadband. © 2011 Erik Dahlman, Stefan Parkvall & Johan Sköld. Published by Elsevier Ltd.
Different types of multi-antenna techniques, including spatial multiplexing, will be discussed in more detail in Chapter 5. Multi-antenna techniques for the specific case of LTE are discussed in Chapters 10 and 11. An alternative to increasing the received signal power is to reduce the noise power, or more exactly the noise power density, at the receiver. This can, at least to some extent, be achieved by more advanced receiver RF design, allowing for a reduced receiver noise figure. 2 Higher Data Rates in Interference-Limited Scenarios The discussion above assumed communication over a radio link only impaired by noise.