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

By Erik Dahlman

ISBN-10: 012385489X

ISBN-13: 9780123854896

LTE (Long time period Evolution) is the 3GPP's (3rd iteration Partnership undertaking) new ordinary 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 which could cater to patron call for for cellular broadband multimedia purposes, the 3GPP has constructed the newest LTE-Advanced (LTE unencumber 10) usual, to be able to be fastened in December 2010. This e-book makes a speciality of LTE and LTE-Advanced, and offers engineers with actual perception and knowing into the why and the way of the normal and its comparable applied sciences. This booklet is written through engineers from Ericsson--the world's prime telecommunications supplier--who used to be seriously considering the improvement of the standard.

  • Follow-up to the very winning 3G Evolution, now targeting LTE and LTE complex ordinary 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, as a way to let engineers to quick snatch the most recent 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 supplies an built-in advent to the applied sciences and the standard
  • Show description

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Extra resources for 4G: LTE/LTE-Advanced for Mobile Broadband

Example text

The use of 16QAM thus allows for up to 4 bits of information to be communicated per symbol interval. 2c), with 64 different signaling alternatives, allows for up to 6 bits of information to be communicated per symbol interval. At the same time, the bandwidth of the transmitted signal is, at least in principle, independent of the size of the modulation alphabet and mainly depends on the modulation rate – that is, the number of modulation symbols per second. The maximum bandwidth utilization, expressed in bits/s/Hz, of 16QAM and 64QAM are thus, at least in principle, two and three times that of QPSK respectively.

On the other hand, in the case of OFDM transmission each modulation symbol is mainly confined to a relatively narrow bandwidth. 8 Selection of Basic OFDM Parameters b 37 Information bit Channel coding Channel coding Frequency interleaving OFDM modulation c1 c2 c3 c4 ... 14 Channel coding in combination with frequency-domain interleaving to provide frequency diversity in the case of OFDM transmission. 13b. Thus, the individual modulation symbols will typically not experience any substantial frequency diversity even if the channel is highly frequency selective over the overall OFDM transmission bandwidth.

1, where it was concluded that transmission with high-bandwidth utilization is inherently power inefficient. The use of rate 1/2 channel coding for 16QAM obviously reduces the information data rate, and thus also the bandwidth utilization, to the same level as uncoded QPSK. From the discussion above it can be concluded that, for a given signal-to-noise/interference ratio, a certain combination of modulation scheme and channel-coding rate is optimal in the sense that it can deliver the highest-bandwidth utilization (the highest data rate within a given bandwidth) for that signal-to-noise/interference ratio.

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


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