Download PDF by Erik Dahlman, Stefan Parkvall, Johan Sköld: 4G LTE/LTE-Advanced for Mobile Broadband
By Erik Dahlman, Stefan Parkvall, Johan Sköld
Achieve perception into 3GPP’s newest commonplace unencumber eleven on LTE/LTE complicated and the way unencumber 12 is developing
To circulate to higher-speed networks which can cater to consumer call for for cellular broadband multimedia purposes, the 3GPP has constructed the newest LTE-Advanced (LTE liberate 10) common, in order to be mounted in December 2010. This publication makes a speciality of LTE and LTE-Advanced, and gives engineers with actual perception and realizing into the why and the way of the normal and its similar applied sciences. This ebook is written via engineers from Ericsson--the world's best telecommunications supplier--who was once seriously curious about the advance of the normal.
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Additional info for 4G LTE/LTE-Advanced for Mobile Broadband
However, the higher bandwidth utilization comes at the cost of reduced robustness to noise and interference. Alternatively expressed, higher-order modulation schemes, such as 16QAM or 64QAM, require a higher Eb /N0 at the receiver for a given bit-error probability, compared to QPSK. 2 Signal constellations for: (a) QPSK; (b) 16QAM; (c) 64QAM. the previous section, where it was concluded that high-bandwidth utilization – that is, a high information rate within a limited bandwidth – in general requires a higher receiver Eb /N0.
Readers are referred to  for a more thorough discussion on different modulation schemes. The use of higher-order modulation provides the possibility for higher bandwidth utilization – that is, the possibility to provide higher data rates within a given bandwidth. However, the higher bandwidth utilization comes at the cost of reduced robustness to noise and interference. Alternatively expressed, higher-order modulation schemes, such as 16QAM or 64QAM, require a higher Eb /N0 at the receiver for a given bit-error probability, compared to 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. 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.
4G LTE/LTE-Advanced for Mobile Broadband by Erik Dahlman, Stefan Parkvall, Johan Sköld