Why block length and delay behave differently if feedback is present
| dc.creator | Sahai, Anant | |
| dc.date | 2006-10-24 | |
| dc.date | 2007-12-06 | |
| dc.date.accessioned | 2026-07-07T08:47:31Z | |
| dc.date.available | 2026-07-07T08:47:31Z | |
| dc.description | For output-symmetric DMCs at even moderately high rates, fixed-block-length communication systems show no improvements in their error exponents with feedback. In this paper, we study systems with fixed end-to-end delay and show that feedback generally provides dramatic gains in the error exponents. A new upper bound (the uncertainty-focusing bound) is given on the probability of symbol error in a fixed-delay communication system with feedback. This bound turns out to have a similar form to Viterbi's bound used for the block error probability of convolutional codes as a function of the fixed constraint length. The uncertainty-focusing bound is shown to be asymptotically achievable with noiseless feedback for erasure channels as well as any output-symmetric DMC that has strictly positive zero-error capacity. Furthermore, it can be achieved in a delay-universal (anytime) fashion even if the feedback itself is delayed by a small amount. Finally, it is shown that for end-to-end delay, it is generally possible at high rates to beat the sphere-packing bound for general DMCs -- thereby providing a counterexample to a conjecture of Pinsker. | |
| dc.description | 42 pages, 22 figures | |
| dc.identifier | https://arxiv.org/abs/cs/0610138 | |
| dc.identifier | http://arxiv.org/abs/cs/0610138 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/143626 | |
| dc.subject | Information Theory | |
| dc.title | Why block length and delay behave differently if feedback is present | |
| dc.type | text |