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Decoupling uplink (UL) and downlink (DL) is a new architectural paradigm where DL and UL are not constrained to be associated to the same base station (BS). Building upon this paradigm, the goal of the present paper is to provide lower, albeit tight bounds for the ergodic UL capacity of a decoupled cellular network. The analysis is performed for a scenario consisting of a macro BS and a set of small...
The <bold>degrees of freedom</bold> (DoF) of the 3-user multiple-input multiple-output (MIMO) interference channel (IC) with full channel state information and constant channel coefficients are investigated when $(p,p+1)$ antennas are deployed at the transmitters and receivers, respectively. The point of departure of this paper is the work of Wang et al., which conjectured but did not...
This work deals with a relay-assisted cellular network, where the downlink communication is carried out in two orthogonal phases. In the first-hop transmission, multiple evolved Node Bs (eNB) transmit in a coordinated way to multiple half-duplex Relay Nodes (RNs). In the second-hop transmission, each RN assists a single User Equipment (UE) without precise channel knowledge. In the first hop, we consider...
We derive a linear transmit precoding scheme based on interference alignment at the transmitters and zero-forcing at the receivers, for the MIMO X channel based on the Generalized Singular Value Decomposition (GSVD) that is able to attain the outer bound on the degrees of freedom (DoF) region [2] for any antenna configuration, except when all terminals have one antenna. Additionally, the proposed...
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