By Erik Dahlman
This ebook makes a speciality of LTE with complete updates together with LTE-Advanced (Release-11) to supply a whole photograph of the LTE system. precise motives are given for the newest LTE criteria for radio interface structure, the actual layer, entry systems, broadcast, relaying, spectrum and RF features, and process performance.
Key applied sciences provided contain multi-carrier transmission, complicated single-carrier transmission, complicated receivers, OFDM, MIMO and adaptive antenna ideas, radio source administration and protocols, and diversified radio community architectures. Their function and use within the context of cellular broadband entry typically is defined, giving either a high-level assessment and extra distinct step by step explanations.
This e-book 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 ways to make use of the hot expertise on the way to remain sooner than the competition.
New to this edition:
- In-depth description of CoMP and more suitable multi-antenna transmission together with new reference-signal buildings and suggestions mechanisms
- Detailed description of the aid for heterogeneous deployments supplied by way of the most recent 3GPP release
- Detailed description of latest more suitable downlink control-channel constitution (EPDDCH)
- New RF configurations together with operation in non-contiguous spectrum, multi-bands base stations and new frequency bands
- Overview of 5G as a collection of well-integrated radio-access applied sciences, together with help for better frequency bands and versatile spectrum administration, mammoth antenna configurations, and ultra-dense deployments
- Covers a whole replace to the most recent 3GPP Release-11
- Two new chapters on HetNet, protecting small cells/heterogeneous deployments, and CoMP, together with Inter-site coordination
- Overview of present prestige of LTE liberate 12 together with extra improvements of local-area, CoMP and multi-antenna transmission, Machine-type-communication, Device-to-device communication
Read Online or Download 4G: LTE/LTE-Advanced for Mobile Broadband, Second Edition PDF
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Extra info for 4G: LTE/LTE-Advanced for Mobile Broadband, Second Edition
To deal with this problem and to make an OFDM signal truly insensitive to time dispersion on the radio channel, so-called cyclic-prefix insertion is typically used in OFDM transmission. 8 Time dispersion and corresponding received-signal timing. Copy and insert a0 OFDM mod. 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.
At the same time, if sufficient received signal power can be made available, basically any data rate can, at least in theory, be provided within a given limited bandwidth. l In the case of low-bandwidth utilization – that is, as long as the radio-link data rate is substantially lower than the available bandwidth – any further increase of the data rate requires approximately the same relative increase in the received signal power. This can be referred to as power-limited operation (in contrast to bandwidth-limited operation; see below) as, in this case, an increase in the available bandwidth does not substantially impact what received signal power is required for a certain data rate.
2 Variations in Instantaneous Transmit Power A general drawback of higher-order modulation schemes such as 16QAM and 64QAM, where information is also encoded in the instantaneous amplitude of the modulated signal, is that the modulated signal will have larger variations, and thus also larger peaks, in its instantaneous power. 3 Distribution of instantaneous power for different modulation schemes. Average power is the same in all cases. 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.