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• W1568279441 abstract "The wireless communications field is experiencing a rapid and steady growth. It is expected that the demand for wireless services will continue to increase in the near and medium term, asking for more capacity and putting more pressure on the usage of radio resources. The conventional cellular architecture considers co-located multiple input multiple output (MIMO) technology, which is a very promising technique to mitigate the channel fading and to increase the cellular system capacity (Foschini & Gans, 1998). On the other hand, orthogonal frequency division multiplexing (OFDM) is a simple technique to mitigate the effects of inter-symbol interference in frequency selective channels (Uppala & Li, 2004), (Bahai et al., 2004). However, the problems inherent to these systems such as shadowing, significant correlation between channels in some environments and intercell interference significantly degrade the capacity gains promised by MIMO techniques (Andrews et al., 2007). Although theoretically attractive, the deployment of MIMO in commercial cellular systems is limited by interference between neighbouring cells, and the entire network is essentially interference-limited (Foschini et al., 2006; Mudumbai et al., 2009). Conventional approaches to mitigate multi-cell interference, such as static frequency reuse and sectoring, are not efficient for MIMO-OFDM networks as each has important drawbacks (Andrews et al., 2007). Universal frequency reuse (UFR), meaning that all cells/sectors operate on the same frequency channel, is mandatory if we would like to achieve spectrallyefficient communications. However, as it is pointed out in (Foschini et al., 2006), this requires joint optimization of resources in all cells simultaneously to boost system performance and to reduce the radiated power. Such systems have the advantage of macrodiversity that is inherent to the widely spaced antennas and more flexibility to deal with intercell interference, which fundamentally limits the performance of user terminals (UTs) at cell edges (Andrews et al., 2007). Different transmit strategies can be considered, depending on the capacity of the backhaul channel that connects the coordinated base stations. Recently, an enhanced cellular architecture with a high-speed backhaul channel has been proposed and implemented, under the European FUTON project (FUTON, 2011), (Diehm et al., 2010). This project aims at the design of a distributed broadband wireless system (DBWS) by carrying out the development of a radio over fiber (RoF) infrastructure transparently connecting the BSs to a central unit (CU) where centralized joint processing can be performed. Also, multi-cell cooperation is already under study in LTE under the Coordinated" @default.
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• W1568279441 date "2011-08-23" @default.
• W1568279441 modified "2023-10-14" @default.
• W1568279441 title "Multi-Cell Cooperation for Future Wireless Systems" @default.
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• W1568279441 doi "https://doi.org/10.5772/18242" @default.
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