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The problem of modulation classification for a multiple-antenna (multiple-input multiple-output (MIMO)) system employing orthogonal frequency-division multiplexing (OFDM) is investigated under the assumption of unknown frequency-selective fading channels and signal-to-noise ratio (SNR). The classification problem is formulated as a Bayesian inference task, and solutions are proposed based on Gibbs...
The performance of uplink HARQ in a Cloud-Radio Access Network (C-RAN) architecture is limited by the two-way latency on the fronthaul links connecting the Remote Radio Heads (RRHs) with the Baseband Unit (BBU) that performs decoding. In order to alleviate this problem, this work considers an alternative architecture based on the separation of control and data planes, in which the control plane is...
Spectrum leasing via cooperation refers to the possibility for primary users to lease part of the spectral resources to secondary users in exchange for cooperation. This paper proposes a novel implementation of this concept in which secondary cooperation aims at improving the secrecy of the primary link. In particular, a secondary transmission with multiple antennas creates interference on both primary...
The impact of multiuser diversity on MIMO downlink is generally measured in terms of two asymptotic quantities derived from the sum-rate, namely the scaling law of the sum-rate versus the number of users n (for a fixed signal-to-noise ratio, SNR) and the multiplexing gain (i.e., asymptotic growth of the sum-rate versus SNR). Designing optimal strategies with respect to these two criteria requires...
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