Space-Time Super-Modulation: Concept, Design Rules, and its Application to Joint Medium Access and Rateless Transmission

摘要

We introduce the concept of Space-Time Super-Modulation according to which additional lowrateudand highly reliable information can be transmitted on top of traditionally modulated and spacetimeudencoded information, without increasing the transmitted block length or degrading their error-rateudperformance. This is achieved by exploiting the temporal redundancy introduced by the space-time blockudcodes and, specifically, by efficiently mapping transmission patterns to specific information content.udWe show that Space-Time Super-Modulation can be efficiently used in the context of machine-typeudcommunications to enable “one-shot”, “grant-free" joint medium access and rateless data transmissionudwhile reducing or even eliminating the need for transmitting preamble sequences. As a result, comparedudwith traditional approaches that use correlatable preamble sequences or encoded preambles to transmitudthe signature information of transmitted packets, Space-Time Super-Modulation can achieve significantudthroughput gains. For example, we show up to 35% throughput gains from the second best examinedudpreamble-based scheme when transmitting blocks of 200 bits.