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Conference, Symposium, and Workshop Papers
Citation key | Dom2020SSP |
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Author | J. Dommel and Z. Utkovski and O. Simeone and S. Stanczak |
Year | 2020 |
Journal | IEEE Statistical Signal Processing Workshop 2020, Rio de Janeiro, Brazil, 12-15 July, 2020 |
Abstract | A multi-cell Fog-Radio Access Network (F-RAN) architecture is considered in which Internet of Things (IoT) devices monitor a number of multi-valued events and transmit in the uplink using grant-free random access. The devices in each cell are connected to an Edge Node (EN), which has a finite-capacity fronthaul link to a Central Processor (CP). In contrast to conventional information-agnostic protocols based on Separate Source-Channel (SSC) coding, where each device uses a separate codebook, this paper considers an information-centric approach based on Joint Source-Channel (JSC) coding via a non-orthogonal generalization of Type-Based Multiple Access (TBMA). According to this transmission protocol, all sensors measuring the same event share the same codebook (with non-orthogonal codewords), and the multi-cell F-RAN architecture directly detects the events' values without first performing individual decoding for each device. Cloud and edge detection schemes based on Bayesian message passing are designed and trade-offs between cloud and edge processing are assessed. |