Results 21 to 30 of about 88,443 (295)

Chemical observations of a polar vortex intrusion [PDF]

open access: yes, 2006
An intrusion of vortex edge air into the interior of the Arctic polar vortex was observed on the 31 January 2005 flight of the NASA DC-8 aircraft. This intrusion was identified as anomalously high values of ozone by Airborne Raman Ozone, Temperature, and
Lait, L. R.   +12 more
core   +1 more source

Universal polar codes

open access: yes2014 IEEE International Symposium on Information Theory, 2014
Submitted to IEEE transactions on Information ...
Seyed Hamed Hassani, RĂ¼diger L. Urbanke
openaire   +2 more sources

Compound polar codes

open access: yes2013 Information Theory and Applications Workshop (ITA), 2013
A capacity-achieving scheme based on polar codes is proposed for reliable communication over multi-channels which can be directly applied to bit-interleaved coded modulation schemes. We start by reviewing the ground-breaking work of polar codes and then discuss our proposed scheme.
Hessam Mahdavifar   +3 more
openaire   +2 more sources

International code for ships operating in polar waters: challenges to polar shipping safety rules in China [PDF]

open access: yes, 2016
With the sea-ice diminishing steadily in the polar regions, there has been growing interest in new transit routes through polar waters using cost-effective transportation. Among the international regulators over polar shipping, the International Maritime
Yan, Huang, Weifang, Li
core   +1 more source

Polar-Coded Modulation

open access: yesIEEE Transactions on Communications, 2013
A framework is proposed that allows for a joint description and optimization of both binary polar coding and $2^m$-ary digital pulse-amplitude modulation (PAM) schemes such as multilevel coding (MLC) and bit-interleaved coded modulation (BICM). The conceptual equivalence of polar coding and multilevel coding is pointed out in detail.
Mathis Seidl   +3 more
openaire   +2 more sources

Systematic Polar Coding [PDF]

open access: yesIEEE Communications Letters, 2011
Polar codes were originally introduced as a class of non-systematic linear block codes. This paper gives encoding and decoding methods for systematic polar coding that preserve the low-complexity nature of non-systematic polar coding while guaranteeing the same frame error rate.
openaire   +4 more sources

Relaxed Polar Codes [PDF]

open access: yesIEEE Transactions on Information Theory, 2017
Conference version,Relaxed Channel Polarization for Reduced Complexity Polar Coding, accepted for presentation at IEEE Wireless Communications and Networking Conference WCNC ...
Mostafa El-Khamy   +4 more
openaire   +2 more sources

A Nearly Optimal Method of Polar Code Constructions for the AWGN Channel

open access: yesIEEE Access, 2021
Polar code is a kind of capacity-approaching code with explicit structure as part of the next generation wireless communication standard. The performance of the polar code is directly determined by the construction method, in which there are three ...
Haichao Sun   +3 more
doaj   +1 more source

On the Origin of Polar Coding [PDF]

open access: yesIEEE Journal on Selected Areas in Communications, 2016
Polar coding was conceived originally as a technique for boosting the cutoff rate of sequential decoding, along the lines of earlier schemes of Pinsker and Massey. The key idea in boosting the cutoff rate is to take a vector channel (either given or artificially built), split it into multiple correlated subchannels, and employ a separate sequential ...
openaire   +4 more sources

A novel method for encoding and decoding based on enhanced parity-check-concatenated polar codes

open access: yesDianxin kexue, 2021
Polar codes have perfect coding and decoding performance as a kind of error correction code, which have become a standard coding scheme for 5G short code control channel. While the length of polar codes is short, its performance is not good enough.
Yan WANG   +3 more
doaj   +2 more sources

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