By Erik Dahlman, Stefan Parkvall, Johan Sköld
Achieve perception into 3GPP’s most modern ordinary liberate eleven on LTE/LTE complex and the way free up 12 is developing
To movement to higher-speed networks that could cater to buyer call for for cellular broadband multimedia functions, the 3GPP has constructed the newest LTE-Advanced (LTE liberate 10) normal, with a purpose 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 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 traditional.
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Extra info for 4G LTE/LTE-Advanced for Mobile Broadband
Cyclic-prefix insertion is beneficial in the sense that it makes an OFDM signal insensitive to time dispersion as long as the span of the time dispersion does not exceed the length of the cyclic prefix. The drawback of cyclic-prefix insertion is that only a fraction Tu/(Tu TCP) of the received signal 34 CHAPTER 3 OFDM Transmission Transmitter a0 Receiver Noise OFDM mod. (IFFT) Channel h(t) CP insertion nTs rn CP insertion removal OFDM demod. 10 Frequency-domain model of OFDM transmission/reception.
L The use of beam-forming by means of multiple transmit antennas will focus the transmit power in the direction of the target receiver, leading to reduced interference to other radio links and thus improving the overall signal-to-interference ratio in the system. l One important difference between interference and noise is that interference, in contrast to noise, typically has a certain structure which makes it, at least to some extent, predictable and thus possible to further suppress or even remove completely.
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.