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In this paper, we consider the downlink of a cognitive radio network where a cognitive base station serves multiple cognitive users on the same frequency band as a group of primary transceivers. The cognitive base station uses an orthogonal scheduling scheme (TDMA/FDMA) to serve its users. For this purpose, the base station is interested in acquiring an estimate of the interference (from the primary...
This paper investigates the impact of limited feedback on user throughput in the uplink of a cellular system. We consider scenarios where the base-station has limited feedback resources, which it needs to allocate across the users it serves. We propose a general model that captures the effect of feedback allocation on the achievable rates for a user, which allows us to characterize the rate region...
Consider a multi-cell relay-assisted time-division uplink system, i.e. one active user per time slot per cell with a relay serving that user. In this paper, we are concerned with heterogeneous networks (networks with unbalanced spatial loads) and we are interested in techniques for increasing the data rate in a congested cell. We propose inter-cell relay cooperation with single-cell decoding as one...
We consider a system-level approach to interference management in a cellular broadband system operating in an interference-limited and highly dynamic regime, as put forth. Here, base stations in neighboring cells (partially) coordinate their transmission schedules in an attempt to avoid simultaneous transmission to their mutual cell edge. Limits on communication overhead and use of the backhaul require...
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