By M. Nicoli, S. Savazzi, O. Simeone (auth.), Maode Ma (eds.)
Recent advancements on instant communique expertise have led to super strategies to make broadband instant networks capable of compete with 3G mobile community. IEEE 802.16X criteria haven't simply distinctive WiMax instant entry networks but in addition designed a framework of instant metropolitan quarter networks with mobility performance. it truly is seen that with additional improvement of varied WiMax applied sciences, wide selection of top quality, versatile instant cellular purposes and prone might be supplied, for you to revolutionarily enhance our sleek existence to accomplish the objective of getting access to the worldwide details anywhere and at any time by way of any cellular machine 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 a very good reference for extra examine and improvement on WiMax structures.
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Extra info for Current Technology Developments of WiMax Systems
Dey, “3G wireless capacity optimization for widely spaced antenna arrays,” IEEE Pers. , Vol. 7, No. 6, pp. 32–35, Dec. 2000. 10. S. Savazzi, O. Simeone, and U. Spagnolini, “Optimal design of linear arrays in a TDMA cellular system with Gaussian interference,” EURASIP Journ. on Wireless Comm. and Networking, Smart Antennas for Next Generation Wireless Systems, 2006. 11. M. Nicoli, L. Sampietro, C. Santacesaria, S. Savazzi, O. Simeone, U. Spagnolini, “Throughput optimization for non-uniform linear antenna arrays in multicell WiMax systems,” Int’l.
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.
As mentioned above, each downlink (uplink) data region is advertised by a different IE in the DL-MAP (UL-MAP). Therefore, when performing frame allocation, one desirable objective would be that of minimizing the MAC control overhead (map overhead hereafter) so as to maximize the capacity available to users. The complexity of the frame allocation task comes from the fact that the above mentioned issues are often in contrast one to each other. g. real-time traffic with strict deadlines, the BS may be forced to grant bandwidth to any MS in certain frames.