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Modulation Adaptive and User Scalablewireless Cooperation for Improved Throughput
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Cooperative wireless communication is a feature of great importance for the upcoming high speed wireless networks. It provides diversity for devices that are physically incapable of harboring multiple antennae by emulating MIMO system. Although cooperative communication fights against multi-path fading, unless it is compensated with appropriate schemes, it results in reduced spectral efficiency which results in decreased throughput. This is clearly against attaining high speed ubiquitous communication. Of the limited options to cope up with such a drawback, this paper presents usage of user number scalable and adaptive modulation based method which makes use of channel state information (CSI). Unlike previous approaches, the bit error rate (BER) of selection combining (SC) at the destination is the constraint to vary M-ary Quadrature Amplitude Modulation (M-QAM) at the relay. In addition, a source relay mapping mechanism called Nearest Neighbor Selection (NNS), that can offer a good potential of practicality as it can be implemented based on device signal strength, is also considered. This scheme is also used to show the scalability of a single user scenario to multiple one. Simulation results show that throughput is improved in the adaptive approach both in the single and multiple user scenarios compared to the fixed modulation cooperation approach.
Keywords
Cooperative Wireless Communications, Adaptive Modulation, CSI, Selection Combining, Spectral Efficiency, Throughput
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