By Erik Dahlman
In line with the bestseller "3G Evolution - HSPA and LTE for cellular broadband" and reflecting the continued good fortune of LTE during the international, this booklet specializes in LTE with complete updates together with LTE-Advanced to supply a whole photo of the LTE approach. evaluation and specified causes are given for the most recent LTE criteria for radio interface structure, the actual layer, entry techniques, broadcast, relaying, spectrum and RF features, and process functionality. Key applied sciences offered contain multi-carrier transmission, complex single-carrier transmission, complex receivers, OFDM, MIMO and adaptive antenna recommendations, complex radio source administration and protocols, and assorted radio community architectures. Their position and use within the context of cellular broadband entry typically is defined. either a high-level evaluation and extra specified step by step causes of the LTE/LTE-Advanced implementation are given. an outline of alternative comparable platforms reminiscent of 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 ways to make use of the recent know-how for you to remain prior to the contest. The authors of the e-book all paintings at Ericsson learn and feature been deeply keen on 3G and 4G improvement and standardisation because the early days of 3G examine. they're major 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 causes of the function of the underlying applied sciences for LTE, together with OFDM and MIMO complete insurance of LTE-Advanced, together with LTE service aggregation, prolonged multi-antenna transmission, relaying performance and heterogeneous deploymentsLTE radio interface structure, actual layer, entry approaches, MBMS, RF features and method functionality lined intimately
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Extra info for 4G: LTE LTE-Advanced for Mobile Broadband
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. This is further discussed in Chapter 4. 1 Multi-Carrier Transmission One way to increase the overall transmission bandwidth, without suffering from increased signal corruption due to radio-channel frequency selectivity, is the use of so-called multi-carrier transmission.
Rather, the subcarrier orthogonality is due to the specific frequency-domain structure of each subcarrier in combination with the specific choice of a subcarrier spacing Δf equal to the persubcarrier symbol rate 1/Tu. 1 of the previous chapter, any corruption of the frequencydomain structure of the OFDM subcarriers, for example due to a frequency-selective radio channel, may lead to a loss of inter-subcarrier orthogonality and thus to interference between subcarriers. 4. 5 can be used to illustrate the basic principles of OFDM modulation and demodulation respectively, these are not the most appropriate modulator/demodulator structures for actual implementation.
5 is that it provides a very smooth evolution, in terms of both radio equipment and spectrum, of an already existing radio-access technology to wider transmission bandwidth and a corresponding possibility for higher data rates, especially for the downlink. In essence this kind of multi-carrier evolution to wider bandwidth can be designed so that, for legacy terminals not capable of multi-carrier reception, each downlink “subcarrier” will appear as an original, more narrowband carrier, while, for a multi-carriercapable terminal, the network can make use of the full multi-carrier bandwidth to provide higher data rates.