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Get 4G: LTE/LTE-Advanced for Mobile Broadband PDF

By Erik Dahlman

ISBN-10: 012385489X

ISBN-13: 9780123854896

LTE (Long time period Evolution) is the 3GPP's (3rd iteration Partnership undertaking) new general and accompanying applied sciences that cellular community operators resembling ATT, Verizon and TeliaSonera are adopting for his or her networks.

to maneuver to higher-speed networks that may cater to consumer call for for cellular broadband multimedia purposes, the 3GPP has constructed the newest LTE-Advanced (LTE unlock 10) usual, so one can be mounted in December 2010. This booklet specializes in LTE and LTE-Advanced, and gives engineers with actual perception and knowing into the why and the way of the normal and its similar applied sciences. This booklet is written via engineers from Ericsson--the world's best telecommunications supplier--who was once seriously enthusiastic about the improvement of the standard.

  • Follow-up to the very winning 3G Evolution, now concentrating on LTE and LTE complicated commonplace 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, so one can let engineers to speedy snatch the newest 3GPP unencumber 10 typical and enforce it of their products
  • Not a contributed ebook as such a lot others in this subject are: this publication provides an built-in advent to the applied sciences and the standard
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Extra resources for 4G: LTE/LTE-Advanced for Mobile Broadband

Sample text

3 Principles for OFDM modulation. 8. As an example, for 3GPP LTE the basic subcarrier spacing equals 15 kHz. On the other hand, the number of subcarriers depends on the transmission bandwidth, with of the order of 600 subcarriers in the case of operation in a 10 MHz spectrum allocation and correspondingly fewer/more subcarriers in the case of smaller/larger overall transmission bandwidths. The term Orthogonal Frequency-Division Multiplex is due to the fact that two modulated OFDM subcarriers xk1 and xk2 are mutually orthogonal over the time interval mTu  t  (m  1)Tu, that is: ( m 1)Tu ∫ xk1 (t ) xk*2 (t ) dt ( m 1)Tu ∫ mTu ak1 ak*2 e j 2 πk1∆ft e j 2 π k2 ∆ft dt 0 for k1 ≠ k2 .

2 Variations in Instantaneous Transmit Power A general drawback of higher-order modulation schemes such as 16QAM and 64QAM, where information is also encoded in the instantaneous amplitude of the modulated signal, is that the modulated signal will have larger variations, and thus also larger peaks, in its instantaneous power. 3 Distribution of instantaneous power for different modulation schemes. Average power is the same in all cases. 3, which illustrates the distribution of the instantaneous power, more specifically the probability that the instantaneous power is above a certain value, for QPSK, 16QAM, and 64QAM respectively.

The use of different types of multi-carrier transmission – that is, transmitting an overall widerband signal as several more narrowband frequency-multiplexed signals (see below). One special case of multi-carrier transmission is OFDM transmission, to be discussed in more detail in Chapter 3. 2. The use of specific single-carrier transmission schemes, especially designed to allow for efficient but still reasonably low-complexity equalization. This is further discussed in Chapter 4. 1 Multi-Carrier Transmission One way to increase the overall transmission bandwidth, without suffering from increased signal corruption due to radio-channel frequency selectivity, is the use of so-called multi-carrier transmission.

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4G: LTE/LTE-Advanced for Mobile Broadband by Erik Dahlman

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