By Erik Dahlman
This publication makes a speciality of LTE with complete updates together with LTE-Advanced (Release-11) to supply an entire photo of the LTE system. distinct motives are given for the most recent LTE criteria for radio interface structure, the actual layer, entry systems, broadcast, relaying, spectrum and RF features, and procedure performance.
Key applied sciences provided comprise multi-carrier transmission, complicated single-carrier transmission, complex receivers, OFDM, MIMO and adaptive antenna suggestions, radio source administration and protocols, and diversified radio community architectures. Their position and use within the context of cellular broadband entry ordinarily is defined, giving either a high-level evaluate and extra precise step by step explanations.
This publication 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 know-how so that it will remain sooner than the competition.
New to this edition:
- In-depth description of CoMP and better multi-antenna transmission together with new reference-signal buildings and suggestions mechanisms
- Detailed description of the aid for heterogeneous deployments supplied via the most recent 3GPP release
- Detailed description of recent stronger 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 suite of well-integrated radio-access applied sciences, together with help for better frequency bands and versatile spectrum administration, titanic antenna configurations, and ultra-dense deployments
- Covers an entire replace to the newest 3GPP Release-11
- Two new chapters on HetNet, overlaying small cells/heterogeneous deployments, and CoMP, together with Inter-site coordination
- Overview of present prestige of LTE unencumber 12 together with additional improvements of local-area, CoMP and multi-antenna transmission, Machine-type-communication, Device-to-device communication
Read or Download 4G: LTE/LTE-Advanced for Mobile Broadband PDF
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Extra info for 4G: LTE/LTE-Advanced for Mobile Broadband
6 OFDM modulation by means of IFFT processing r0 r1 aˆ 0 aˆ1 aˆ 0 , aˆ1 ,... 7 OFDM demodulation by means of FFT processing It is important to understand that IDFT/IFFT-based implementation of an OFDM modulator, and even more so the exact IDFT/IFFT size, are just transmitter-implementation choices and not something that would be mandated by any radio-access specification. 3. Also, nothing prevents the use of a larger IFFT size, for example a size-2048 IFFT, even in the case of a smaller number of OFDM subcarriers.
However, the higher bandwidth utilization comes at the cost of reduced robustness to noise and interference. Alternatively expressed, higher-order modulation schemes, such as 16QAM or 64QAM, require a higher Eb/N0 at the receiver for a given bit-error probability, compared to QPSK. This is in line with the discussion in the previous section, where it was concluded that high-bandwidth utilizationda high information rate within a limited bandwidthdin general requires a higher receiver Eb/N0. 1 Higher-order modulation in combination with channel coding Higher-order modulation schemes such as 16QAM and 64QAM require a higher receiver Eb/N0 for a given error rate, compared to QPSK.
6 Theoretical WCDMA spectrum. 22 A second drawback of multi-carrier transmission is that, similar to the use of higher-order modulation, the parallel transmission of multiple carriers will lead to larger variations in the instantaneous transmit power. Thus, similar to the use of higher-order modulation, multicarrier transmission will have a negative impact on the transmitter power-amplifier efficiency, implying increased transmitter power consumption and increased power-amplifier cost. Alternatively, the average transmit power must be reduced, implying a reduced range for a given data rate.