FeedNetBack D03.04 -Wireless Transmission for Control

Abstract

This report documents the research work carried out for Task 3.3. on wireless transmission for control. The main objective is to study and develop physical layer communication strategies which are adapted to fit a given control application. Accordingly, most of the work deal with reliable wireless transmission strategies under strict delay constraints. Five different approaches are taken. First, two novel transmission schemes for communication over unknown fading channels using non-orthogonal CDMA transmission for multi-sensor and/or multi-agents systems are proposed and discussed. Second, two novel instantaneous source coding mappings for a distributed source-channel coding problem are proposed, based on the study on the Cramér-Rao lower bound and the impact of the stretch factor. The scheme can be used to reduce transmission rate or mitigate the effects of the channel noise in the case of analog transmission. Next, a low-delay cooperative relaying strategy is proposed with an instantaneous mapping function which compresses all received signals in an orthogonal multiple-access relay channel. The optimization of the function results in non-linear mappings which in general outperform linear mappings. Further, the fundamental trade-off between reliability and delay is studied. To this end, upper bounds on the average error probability for sequential coding for the bidirectional broadcast channel with streaming sources are derived and the existence of a deterministic code is proved. Lastly, causal anytime codes based on unequal error protection using Luby transform codes for transmission over symmetric discrete memoryless channel are proposed and analytical upper-bounds on the end-to-end distortion of two anytime transmission schemes are derived