Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks
AbstractThis paper discusses robust link adaptation for a downlink precoded multiple input single output system, for guaranteeing ultra-reliable (99.999%) transmissions to mobile users (e.g., slowly moving machines in a factory) served by a small cell network. The proposed technique compensates the effect of inaccurate channel state information (CSI) caused by user mobility, as well as the variation of precoders in the interfering cells. Both of these impairments translate into instability of the received signal-to-noise plus interference ratios (SINRs), and may lead to CSI mispredictions and potentially erroneous transmissions. We show that, by knowing the statistics of the propagation channels and the precoders variations, it is possible to compute a backoff that guarantees robust link adaptation. The backoff value is based on the statistics of realized SINR, and is consequently used to adapt the transmissions according to current channel state. Theoretical analysis accompanied by simulation results show that the proposed approach is suitable for attaining 5G ultra-reliability targets in realistic settings. View Full-Text
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Oruthota, U.; Ahmed, F.; Tirkkonen, O. Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks. Information 2016, 7, 14.
Oruthota U, Ahmed F, Tirkkonen O. Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks. Information. 2016; 7(1):14.Chicago/Turabian Style
Oruthota, Udesh; Ahmed, Furqan; Tirkkonen, Olav. 2016. "Ultra-Reliable Link Adaptation for Downlink MISO Transmission in 5G Cellular Networks." Information 7, no. 1: 14.
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