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The authors study the network spectral efficiency of decentralized vector Multiple Access Channels (MACs) when the number of accessible dimensions per transmitter is strategically limited. Considering each dimension as a frequency band, they call this limiting process Bandwidth Limiting (BL). Assuming that each transmitter maximizes its own data rate by water-filling over the available frequency bands, they consider two scenarios. In the first scenario, transmitters use non-intersecting sets of bands (spectral resource partition), and in the second one, they freely exploit all the available frequency bands (spectral resource sharing).
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