By Erik Dahlman
LTE (Long time period Evolution) is the 3GPP's (3rd new release Partnership undertaking) new normal and accompanying applied sciences that cellular community operators equivalent to ATT, Verizon and TeliaSonera are adopting for his or her networks.
to maneuver to higher-speed networks that could cater to shopper call for for cellular broadband multimedia functions, the 3GPP has built the newest LTE-Advanced (LTE liberate 10) typical, that allows you to be fastened in December 2010. This booklet makes a speciality of LTE and LTE-Advanced, and gives engineers with actual perception and realizing into the why and the way of the traditional and its comparable applied sciences. This booklet is written by way of engineers from Ericsson--the world's best telecommunications supplier--who used to be seriously inquisitive about the improvement of the standard.
- Follow-up to the very winning 3G Evolution, now targeting LTE and LTE complicated commonplace and its accompanying technologies
- Complete and transparent rationalization of LTE complex by means of the people who performed a number one function in its improvement, so one can allow engineers to speedy clutch the most recent 3GPP unencumber 10 normal and enforce it of their products
- Not a contributed publication as so much others in this subject are: this publication offers an built-in creation to the applied sciences and the standard
Read Online or Download 4G: LTE/LTE-Advanced for Mobile Broadband PDF
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Additional info for 4G: LTE/LTE-Advanced for Mobile Broadband
2) mTu Thus, basic OFDM transmission can be seen as the modulation of a set of orthogonal functions ϕk(t), where ϕk (t ) e j 2 πk∆ft 0 0 t Tu . 4, where each “column” corresponds to one OFDM symbol and each “row” corresponds to one OFDM subcarrier. 5 illustrates the basic principle of OFDM demodulation consisting of a bank of correlators, one for each subcarrier. 4 − j 2πf Nc −1t (m +1)Tu ∫K OFDM time–frequency grid. 5 Basic principle of OFDM demodulation. each other after demodulation.
9 Cyclic-prefix insertion. 9, cyclic-prefix insertion implies that the last part of the OFDM symbol is copied and inserted at the beginning of the OFDM symbol. Cyclic-prefix insertion thus increases the length of the OFDM symbol from Tu to Tu TCP, where TCP is the length of the cyclic prefix, with a corresponding reduction in the OFDM symbol rate as a consequence. 9, if the correlation at the receiver side is still only carried out over a time interval Tu 1/Δf, subcarrier orthogonality will then also be preserved in the case of a time-dispersive channel, as long as the span of the time dispersion is shorter than the cyclic-prefix length.
L A too small subcarrier spacing increases the sensitivity of the OFDM transmission to Doppler spread and different kinds of frequency inaccuracies. 5). In the case of such channel variations, for example due to very high Doppler spread, the orthogonality between subcarriers will be lost, with inter-subcarrier interference as a consequence. 15 illustrates the subcarrier signal-to-interference ratio due to inter-subcarrier interference between two neighboring subcarriers, as a function of the normalized Doppler spread.