Nokia Corporation

Emanuele Viterbo

Ari T Hottinen

A method includes operating a transmitter connected with ntransmit antennas serving K users having nreceive antennas each; and scheduling which users are to be simultaneously served in a same time-frequency-code slot. A particular user pairing configuration is denoted by &#x3c0; within a set of all configurations &#x3a0;, and scheduling includes expressing mutual information as an additive objective function and maximizing the additive objective function over a particular choice of &#x3c0;&#x3b5;&#x3a0;.

Optimal user pairing for downlink multiuser MIMO

First are determined which relays are available between at least one source and at least one destination, and from them are selected a subset of those relays for an activation interval under a constraint of equal transmit energy per selected relay across the activation interval. A matrix is formed, using CSI received from the relays, to evaluate each effective channel between source and destination that goes through each of the relays, including multi-relay hops, and the relays are selected from that matrix. Utility of source-relay pairing is evaluated in view of the relay-destination channel and the pairing enables relays to multiplex multiple sources where feasible.

Method, apparatus and computer program for relay selection

A method includes operating a receiver connected with nreceive antennas to receive uplink signals from K users having ntransmit antennas each; and scheduling which users are to transmit in a same time-frequency-code slot. A particular user pairing configuration is denoted by &#x3c0; within a set of all configurations &#x3a0;, and scheduling includes expressing mutual information as an additive objective function and maximizing the additive objective function over a particular choice of &#x3c0;&#x3b5;&#x3a0;.

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Turin, Italy

Emanuele Viterbo