By Erik Dahlman
In line with the bestseller "3G Evolution - HSPA and LTE for cellular broadband" and reflecting the continuing good fortune of LTE in the course of the international, this booklet specializes in LTE with complete updates together with LTE-Advanced to supply a whole photo of the LTE approach. assessment and special causes are given for the newest LTE criteria for radio interface structure, the actual layer, entry strategies, broadcast, relaying, spectrum and RF features, and method functionality. Key applied sciences provided contain multi-carrier transmission, complex single-carrier transmission, complex receivers, OFDM, MIMO and adaptive antenna recommendations, complicated radio source administration and protocols, and diversified radio community architectures. Their function and use within the context of cellular broadband entry normally is defined. either a high-level assessment and extra exact step by step motives of the LTE/LTE-Advanced implementation are given. an outline of different comparable platforms similar to GSM/EDGE, HSPA, CDMA2000, and WIMAX is additionally supplied. This ebook is a 'must-have' source for engineers and different execs within the telecommunications undefined, operating with mobile or instant broadband applied sciences, giving an knowing of the way to make use of the hot expertise in an effort to remain sooner than the contest. The authors of the publication all paintings at Ericsson learn and feature been deeply concerned about 3G and 4G improvement and standardisation because the early days of 3G examine. they're best specialists within the box and are at the present time nonetheless actively contributing to the standardisation of LTE inside 3GPP. Includes complete information of the most recent additions to the LTE Radio entry criteria and applied sciences as much as and together with 3GPP unencumber 10Clear factors of the function of the underlying applied sciences for LTE, together with OFDM and MIMO complete assurance of LTE-Advanced, together with LTE provider aggregation, prolonged multi-antenna transmission, relaying performance and heterogeneous deploymentsLTE radio interface structure, actual layer, entry tactics, MBMS, RF features and approach functionality coated intimately
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Extra info for 4G: LTE LTE-Advanced for Mobile Broadband
3, which illustrates the distribution of the instantaneous power, more specifically the probability that the instantaneous power is above a certain value, for QPSK, 16QAM, and 64QAM respectively. Clearly, the probability for large peaks in the instantaneous power is higher in the case of higher-order modulation. Larger peaks in the instantaneous signal power imply that the transmitter power amplifier must be over-dimensioned to avoid power-amplifier nonlinearities, occurring at high instantaneous power levels, causing corruption to the signal to be transmitted.
This will reduce the relative interference level and thus allow for higher data rates. l Similar to the increase in signal-to-noise ratio, proper combination of the signals received at multiple antennas will also increase the signal-to-interference ratio after the antenna combination. 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.
However, there are several critical issues related to the use of wider transmission bandwidths in a mobile-communication system: Spectrum is, as already mentioned, often a scarce and expensive resource, and it may be difficult to find spectrum allocations of sufficient size to allow for very wideband transmission, especially at lower-frequency bands. l The use of wider transmission and reception bandwidths has an impact on the complexity of the radio equipment, both at the base station and at the terminal.
4G: LTE LTE-Advanced for Mobile Broadband by Erik Dahlman