By Erik Dahlman
LTE (Long time period Evolution) is the 3GPP's (3rd iteration Partnership undertaking) new commonplace 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 may cater to shopper call for for cellular broadband multimedia functions, the 3GPP has constructed the most recent LTE-Advanced (LTE unencumber 10) typical, with a purpose to be mounted in December 2010. This booklet makes a speciality of LTE and LTE-Advanced, and offers engineers with genuine perception and figuring out into the why and the way of the traditional and its similar applied sciences. This ebook is written by means of engineers from Ericsson--the world's top telecommunications supplier--who used to be seriously considering the improvement of the standard.
- Follow-up to the very profitable 3G Evolution, now targeting LTE and LTE complicated usual and its accompanying technologies
- Complete and transparent rationalization of LTE complex by way of the people who performed a number one position in its improvement, with a view to permit engineers to quick take hold of the newest 3GPP unencumber 10 ordinary and enforce it of their products
- Not a contributed publication as such a lot others in this subject are: this ebook supplies 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
This includes the possibility for higher peak data rates but, as pointed out in the previous chapter, even more so the possibility for significantly higher data rates over the entire cell area, also including, for example, users at the cell edge. The initial part of this chapter will briefly discuss some of the more fundamental constraints that exist in terms of what data rates can actually be achieved in different scenarios. This will provide a background to subsequent discussions in the later part of the chapter, as well as in the subsequent chapters, concerning different means to increase the achievable data rates in different mobile-communication scenarios.
The IFFT size can then, for example, be selected as N 1024. 36 MHz, where Δf 15 kHz is the LTE subcarrier spacing. It is important to understand that IDFT/IFFT-based implementation of an OFDM modulator, and even more so the exact IDFT/IFFT size, are just transmitter-implementation choices and not something that would be mandated by any radio-access specification. 3. Also, nothing prevents the use of a larger IFFT size, for example a size-2048 IFFT size, even in the case of a smaller number of OFDM subcarriers.
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. As an example, if a bandwidth utilization of close to 2 information bits per modulation symbol is required, QPSK modulation would allow for very limited channel coding (channel-coding rate close to 1). On the other hand, the use of 16QAM modulation would allow for a channel-coding rate of the order of one-half.