By M. Nicoli, S. Savazzi, O. Simeone (auth.), Maode Ma (eds.)
Recent advancements on instant conversation expertise have ended in large options to make broadband instant networks in a position to compete with 3G mobile community. IEEE 802.16X criteria haven't basically precise WiMax instant entry networks but in addition designed a framework of instant metropolitan quarter networks with mobility performance. it really is visible that with extra improvement of assorted WiMax applied sciences, wide variety of fine quality, versatile instant cellular functions and companies may be supplied, in order to revolutionarily increase our smooth existence to accomplish the aim of gaining access to the worldwide info anywhere and at any time through any cellular equipment sooner or later. Current expertise advancements of WiMax Systems addresses the new advancements of WiMax applied sciences for either academia and undefined. it truly is anticipated to be an outstanding reference for additional learn and improvement on WiMax structures.
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Additional info for Current Technology Developments of WiMax Systems
1 Subframe Allocation: Static vs. Dynamic The first-phase of TPP is advantageous in utilizing the bandwidth when the load of the uplink and downlink are different, as Fig. 3 proves. The FTP traffic load of the downlink is three times of the uplink. In Fig. 3a the downlink utilization is bound to 50% because of the static subframe allocation. However, by stealing the unused uplink slot columns for the downlink, TPP improves the overall link utilization from 75 to 96%. (b) 100 90 80 70 60 50 40 30 20 10 0 Total 0 10 Downlink 20 30 Uplink 40 50 Time (sec) Bandwidth utilization (%) Bandiwidth utilization (%) (a) 60 70 80 100 90 80 70 60 50 40 30 20 10 0 Total 0 10 20 30 Downlink 40 50 Time (sec) 60 Uplink 70 80 Fig.
It M. V. 2009 31 32 A. Bacioccola et al. 1 Introduction During the last few years, we have witnessed a daunting increase of the use of electronic communication devices in everyday life. This is due to the spread of sophisticated handheld equipments, such as mobile phones and palmtops, which are available at an increasingly lower cost. This has boosted a technology advance in the area of mobile Broadband Wireless Access (BWA), since these devices, by necessity, cannot rely on the use of wired connections.
34 A. Bacioccola et al. Fig. 16e OFDMA sample TDD frame structure. The number of OFDMA symbols and sub-channels reported in the figure are not realistic With a slight abuse of notation, we can consider a frame as a matrix where rows and columns are sub-channels and OFDMA symbols, respectively (see Fig. 1). The number of OFDMA symbols and sub-channels per frame depends on the frame duration, the channel bandwidth, the Fast Fourier Transform (FFT) size, the Cyclic Prefix length, the direction, and the sub-carrier permutation.