Broadcasting a Common Message with Variable-Length Stop-Feedback Codes
Paper i proceeding, 2015

We investigate the maximum coding rate achievable over a two-user broadcast channel for the scenario where a common message is transmitted using variable-length stop-feedback codes. Specifically, upon decoding the common message, each de- coder sends a stop signal to the encoder, which transmits continuously until it receives both stop signals. For the point-to-point case, Polyanskiy, Poor, and Verdu (2011) recently demonstrated that variable-length coding combined with stop feedback significantly increases the speed at which the maximum coding rate con- verges to capacity. This speed-up manifests itself in the absence of a square-root penalty in the asymptotic expansion of the maximum coding rate for large blocklengths, a result a.k.a. zero dispersion. In this paper, we show that this speed-up does not necessarily occur for the broadcast channel with common message. Specifically, there exist scenarios for which variable-length stop-feedback codes yield a positive dispersion.


Kasper Fløe Trillingsgaard

Aalborg Universitet

Wei Yang

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Giuseppe Durisi

Chalmers, Signaler och system, Kommunikations- och antennsystem, Kommunikationssystem

Petar Popovski

Aalborg Universitet

IEEE International Symposium on Information Theory - Proceedings

21578095 (ISSN)

2505-2509 7282907


Informations- och kommunikationsteknik







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