Transmission of Analog Information Over the Multiple Access Relay Channel Using Zero-Delay Non-Linear Mappings

We consider the zero-delay encoding of discrete-time analog information over the Multiple Access Relay Channel (MARC) using non-linear mapping functions. On the one hand, zero-delay non-linear mappings are capable to deal with the multiple access interference (MAI) caused by the simultaneous transmi...

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Vydáno v:IEEE access Ročník 7; s. 48405 - 48416
Hlavní autoři: Fresnedo, Oscar, Suarez-Casal, Pedro, Castedo, Luis
Médium: Journal Article
Jazyk:angličtina
Vydáno: Piscataway IEEE 2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Combined source-channel coding
Complexity theory
Decoding
Delay
Delays
Encoding
Mapping
Messages
Multiple access
multiuser channels
Network coding
Receivers
Relay
relay networks
Relaying
Relays
Transmitters
ISSN:2169-3536, 2169-3536
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Shrnutí:We consider the zero-delay encoding of discrete-time analog information over the Multiple Access Relay Channel (MARC) using non-linear mapping functions. On the one hand, zero-delay non-linear mappings are capable to deal with the multiple access interference (MAI) caused by the simultaneous transmission of the information. On the other, the relaying operation is a Decode-and-Forward (DF) strategy where the decoded messages are merged into a single message using a specific continuous mapping depending on the correlation level of the source information. At the receiver, an approximated Minimum Mean Squared Error (MMSE) decoder is developed to obtain an estimate of the transmitted source symbols which exploits the information received from the relay node in combination with the messages received from the transmitters through the direct links. The resulting system provides better performance than the other alternative encoding strategies for the MARC with similar complexity and delay and also approaches the performance of theoretical strategies which require a significantly higher delay and computational cost.
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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2909318