On the scaling of polar codes: II. The behavior of un-polarized channels

We provide upper and lower bounds on the escape rate of the Bhattacharyya process corresponding to polar codes where transmission takes place over the the binary erasure channel. More precisely, we bound the exponent of the number of sub-channels whose Bhattacharyya constant falls in a fixed interval [a, b]. Mathematically this can be stated as bounding the limit lim(n ->infinity) 1/n ln P(Zn is an element of [a, b]), where Z(n) is the Bhattacharyya process. The quantity P( Z(n) is an element of[a, b]) represents the fraction of sub-channels that are still un-polarized at time n.


Published in:
2010 IEEE International Symposium on Information Theory, 879-883
Presented at:
2010 IEEE International Symposium on Information Theory - ISIT, Austin, TX, USA, 13-18 06 2010
Year:
2010
Publisher:
IEEE
Laboratories:




 Record created 2010-08-31, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)