LTE, LTE-Advanced and WiMAX: Towards IMT-Advanced Networks by Abd-Elhamid M. Taha

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By Abd-Elhamid M. Taha

WiMAX. There exists a robust call for for totally extending rising web companies, together with collaborative functions and social networking, to the cellular and instant area. offering such companies could be attainable in basic terms via understanding broadband within the instant. candidate applied sciences are presently competing in pleasant the necessities for instant broadband networks, WiMAX and LTE. in the intervening time, LTE and its destiny evolution LTE-Advanced are already gaining floor by way of seller and operator help. when either applied sciences percentage convinced attributes (utilizing Orthogonal Frequency department a number of entry (OFDMA) in downlink, accommodating clever antennas and entire aid for IP-switching, for example), they vary in others (including uplink know-how, scheduling, body constitution and mobility support). past technological advantages, elements reminiscent of deployment readiness, atmosphere adulthood and migration feasibility come to gentle whilst evaluating the capability of the 2 applied sciences. LTE, LTE-Advanced and WiMAX: in the direction of IMT-Advanced Networks presents a concise, no-nonsense creation to the 2 applied sciences, masking either interface and networking issues. extra seriously, the publication offers a multi-faceted comparability, conscientiously reading and distinguishing the features of every know-how and spanning either technical and monetary benefits. A “big photograph” realizing of the industry techniques and forecasts is additionally provided. Discusses and severely evaluates LTE, LTE-Advanced and WiMAX (Legacy and complex)

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Example text

Of particular importance is the performance at the cell-edge, that is, connection quality at overlaps between the coverage areas of neighboring cells, which have been repeatedly remarked to be low in 3G networks. Such problems would usually be addressed by increasing the deployment of Base Stations (BS), which in addition to their high costs entail additional interconnection and frequency optimization challenges. Certain performance aspects of 3G networks were also expected to be more pronounced.

1. The sequence of L modulated symbols, x0 , x1 , . . , xL−1 , are converted into L parallel streams before taking the N -point Inverse Fast Fourier Transform (IFFT) of each. The possible mismatch between L and N is overcome by zero padding the remaining N − L inputs of the IFFT block. Next, the N outputs, s0 , s1 , . . , sN −1 are converted back to a serial stream before adding the Cyclic Prefix (CP). Finally, the resulting OFDM block is converted to its analog form prior to sending it over the channel.

The objective of this chapter is to elaborate on the motivation for IMTAdvanced networks. The following section summarizes the evolution of the wireless generations, indicating the great advances that have thus far been achieved in wireless communications in general. We next elaborate on the exact motivations for IMT-Advanced. 3 describes the expected features of IMT-Advanced systems, and the elements of performance used to specify their requirements. 4 then introduces the two RIT that have been recently approved as satisfying the ITU-R requirements.

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