By Amitabha Ghosh
This functional, one-stop consultant will speedy carry you up to the mark on LTE and LTE-Advanced. With every thing you want to learn about the speculation and know-how in the back of the factors, it is a must-have for engineers and executives within the instant undefined.
• First publication of its sort describing applied sciences and method functionality of LTE-A
• Covers the evolution of electronic instant expertise, fundamentals of LTE and LTE-A, layout of downlink and uplink channels, multi-antenna ideas and heterogeneous networks
• Analyzes functionality merits over competing applied sciences, together with WiMAX and 802.16m
• displays the newest LTE Release-10 standards
• contains a number of examples, together with wide procedure and hyperlink results
• special approach is obtainable to technical and non-technical readers alike
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Additional info for Essentials of LTE and LTE-A
Channel estimation is performed on the basis of the pilots that have been embedded into the transmission packet. In addition to channel estimation, frequency and timing estimation and correction may also be performed. Subcarrier demapping and equalization is done next, followed by an IDFT and ﬁnally an M-point IDFT. Unlike in conventional FDMA, the addition of an M-point DFT/IDFT is used to spread out each modulated data symbol onto all of the subcarriers used. This lowers the peak-to-average power of the transmission signal, resulting in higher maximum transmission power.
Currently, only one UE power class is deﬁned, with a maximum output power of 23 dBm and a tolerance of ±2 dB. The minimum power output is −40 dBm. The actual UE transmit power, however, is determined using a power-control formula and controlled by the eNB. To allow for implementation margin, a tolerance band is provided. For instance, if the UE has not had an uplink transmission within the last 20 ms, a tolerance of ±9 dB is allowed. That is, the actual transmit power of the UE can be within 9 dB of the desired power.
Users are allocated resources within the PDSCH via a scheduling assignment contained in the downlink control information. In LTE Rel-8, SU-MIMO and MU-MIMO are both supported. In SU-MIMO, multiple data streams are simultaneously transmitted to the same user using the same physical resource blocks. In MU-MIMO, multiple data streams are simultaneously 3 . 4 d a t a t r a n s m i s s i o n 43 transmitted to different users using the same physical resource blocks. SU-MIMO requires signaling to inform the users of the relevant transmission parameters, whereas MU-MIMO operation is transparent to the users.
Essentials of LTE and LTE-A by Amitabha Ghosh