Download e-book for iPad: 4G: LTE/LTE-Advanced for Mobile Broadband by Erik Dahlman

By Erik Dahlman

ISBN-10: 012385489X

ISBN-13: 9780123854896

LTE (Long time period Evolution) is the 3GPP's (3rd iteration Partnership venture) new normal 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 functions, the 3GPP has constructed the most recent LTE-Advanced (LTE unlock 10) usual, so as to be fastened in December 2010. This publication specializes in LTE and LTE-Advanced, and offers engineers with actual perception and figuring out 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 was once seriously focused on the improvement of the standard.

  • Follow-up to the very profitable 3G Evolution, now targeting LTE and LTE complex average and its accompanying technologies
  • Complete and transparent rationalization of LTE complex by means of the people who performed a number one position in its improvement, to be able to allow engineers to fast take hold of the most recent 3GPP unlock 10 general 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 advent to the applied sciences and the standard
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Additional resources for 4G: LTE/LTE-Advanced for Mobile Broadband

Example text

However, in combination with channel coding the use of higher-order modulation will sometimes be more efficient – that is, require a lower receiver Eb /N0 for a given error rate – compared to the use of lower-order modulation such as QPSK. This may, for example, occur when the target bandwidth utilization implies that, with lower-order modulation, no or very little channel coding can be applied. In such a case, the additional channel coding that can be applied by using a higher-order modulation scheme such as 16QAM may lead to an overall gain in power efficiency compared to the use of QPSK.

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).

2 Higher Data Rates in Interference-Limited Scenarios The discussion above assumed communication over a radio link only impaired by noise. However, in actual mobile-communication scenarios, interference from transmissions in neighboring cells, also referred to as inter-cell interference, is often the dominant source of radio-link impairment, more so than noise. This is especially the case in small-cell deployments with a high traffic load. Furthermore, in addition to inter-cell interference there may in some cases also be interference from other transmissions within the current cell, also referred to as intra-cell interference.

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

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