By Erik Dahlman
In accordance with the bestseller "3G Evolution - HSPA and LTE for cellular broadband" and reflecting the continued good fortune of LTE in the course of the international, this publication specializes in LTE with complete updates together with LTE-Advanced to supply an entire photograph of the LTE procedure. evaluate and precise factors are given for the most recent LTE criteria for radio interface structure, the actual layer, entry methods, broadcast, relaying, spectrum and RF features, and approach functionality. Key applied sciences offered contain multi-carrier transmission, complex single-carrier transmission, complicated receivers, OFDM, MIMO and adaptive antenna options, complex radio source administration and protocols, and assorted radio community architectures. Their position and use within the context of cellular broadband entry commonly is defined. either a high-level assessment and extra targeted step by step reasons of the LTE/LTE-Advanced implementation are given. an summary of different similar platforms reminiscent of GSM/EDGE, HSPA, CDMA2000, and WIMAX is additionally supplied. This e-book is a 'must-have' source for engineers and different execs within the telecommunications undefined, operating with mobile or instant broadband applied sciences, giving an figuring out of ways to make use of the recent expertise to be able to remain sooner than the contest. The authors of the booklet all paintings at Ericsson study and feature been deeply fascinated with 3G and 4G improvement and standardisation because the early days of 3G examine. they're major specialists within the box and are this present day nonetheless actively contributing to the standardisation of LTE inside of 3GPP. Includes complete info of the newest additions to the LTE Radio entry criteria and applied sciences as much as and together with 3GPP free up 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 strategies, MBMS, RF features and procedure functionality coated intimately
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Extra info for 4G: LTE LTE-Advanced for Mobile Broadband
All rights reserved. 1 (a) Per-subcarrier pulse shape. (b) Spectrum for basic OFDM transmission. 2 OFDM subcarrier spacing. that, during each OFDM symbol interval, Nc modulation symbols are transmitted in parallel. The modulation symbols can be from any modulation alphabet, such as QPSK, 16QAM, or 64QAM. The number of OFDM subcarriers can range from less than hundred to several thousand, with the subcarrier spacing ranging from several hundred kHz down to a few kHz. What subcarrier spacing to use depends on what types of environments the system is to operate in, including such aspects as the maximum expected radio-channel frequency selectivity (maximum expected time dispersion) and the maximum expected rate of channel variations (maximum expected Doppler spread).
In the following, two such approaches to widerband transmission will be discussed: • 1. The use of different types of multi-carrier transmission – that is, transmitting an overall widerband signal as several more narrowband frequency-multiplexed signals (see below). One special case of multi-carrier transmission is OFDM transmission, to be discussed in more detail in Chapter 3. 2. The use of specific single-carrier transmission schemes, especially designed to allow for efficient but still reasonably low-complexity equalization.
Equalization has been shown to provide satisfactory performance with reasonable complexity at least up to bandwidths corresponding to the WCDMA bandwidth of 5 MHz (see, for example, ). However, if the transmission bandwidth is further increased up to, for example, 20 MHz, as is done in LTE, the complexity of straightforward high-performance equalization starts to become a serious issue. One option is then to apply less optimal equalization, with a corresponding negative impact on the equalizer capability to counteract the signal corruption due to radio-channel frequency selectivity and thus a corresponding negative impact on the radio-link performance.
4G: LTE LTE-Advanced for Mobile Broadband by Erik Dahlman