By Erik Dahlman
In accordance with the bestseller "3G Evolution - HSPA and LTE for cellular broadband" and reflecting the continuing luck of LTE in the course of the global, this e-book specializes in LTE with complete updates together with LTE-Advanced to supply an entire photograph of the LTE procedure. review and designated reasons are given for the newest LTE criteria for radio interface structure, the actual layer, entry strategies, broadcast, relaying, spectrum and RF features, and approach functionality. Key applied sciences provided contain multi-carrier transmission, complex single-carrier transmission, complex receivers, OFDM, MIMO and adaptive antenna ideas, complicated radio source administration and protocols, and varied radio community architectures. Their position and use within the context of cellular broadband entry normally is defined. either a high-level evaluation and extra precise step by step reasons of the LTE/LTE-Advanced implementation are given. an summary of alternative comparable structures corresponding to GSM/EDGE, HSPA, CDMA2000, and WIMAX is additionally supplied. This ebook is a 'must-have' source for engineers and different pros within the telecommunications undefined, operating with mobile or instant broadband applied sciences, giving an knowing of the way to make use of the recent expertise in an effort to remain prior to the contest. The authors of the publication all paintings at Ericsson learn and feature been deeply eager about 3G and 4G improvement and standardisation because the early days of 3G study. they're major specialists within the box and are at the present time nonetheless actively contributing to the standardisation of LTE inside of 3GPP. Includes complete info of the most recent additions to the LTE Radio entry criteria and applied sciences as much as and together with 3GPP liberate 10Clear causes of the function of the underlying applied sciences for LTE, together with OFDM and MIMO complete assurance of LTE-Advanced, together with LTE service aggregation, prolonged multi-antenna transmission, relaying performance and heterogeneous deploymentsLTE radio interface structure, actual layer, entry systems, MBMS, RF features and process functionality coated intimately
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Extra info for 4G: LTE LTE-Advanced for Mobile Broadband
1b. 2). 3. It consists of a bank of Nc complex modulators, where each modulator corresponds to one OFDM subcarrier. 1) k 0 where xk(t) is the kth modulated subcarrier with frequency fk k Δf and ak( m ) is the, generally complex, modulation symbol applied to the kth subcarrier during the mth OFDM symbol interval – that is, during the time interval mTu t (m 1)Tu. 4. 4G LTE/LTE-Advanced for Mobile Broadband. © 2011 Erik Dahlman, Stefan Parkvall & Johan Sköld. Published by Elsevier Ltd. All rights reserved.
As channel coding is typically used in most cases of mobile communication this is not a very serious drawback, especially taking into account that a significant part of the available frequency diversity can be captured already with a relatively high code rate. 8 SELECTION OF BASIC OFDM PARAMETERS If OFDM is to be used as the transmission scheme in a mobile-communication system, the following basic OFDM parameters need to be decided upon: The subcarrier spacing Δf. The number of subcarriers Nc, which, together with the subcarrier spacing, determines the overall transmission bandwidth of the OFDM signal.
12 Time–frequency grid with known reference symbols. 13 (a) Transmission of single wideband carrier. (b) OFDM transmission over a frequency-selective channel. 3 in the previous chapter, a radio channel is always subject to some degree of frequency selectivity, implying that the channel quality will vary in the frequency domain. In the case of a single wideband carrier, such as a WCDMA carrier, each modulation symbol is transmitted over the entire signal bandwidth. 13a), each modulation symbol will be transmitted both over frequency bands with relatively good quality (relatively high signal strength) and frequency bands with low quality (low signal strength).