A novel cross coding scheme for OFDM systems

In wireless OFDM-based systems, coding jointly over all the sub-carriers simultaneously performs better than coding separately per sub-carrier. However, the joint coding is not always optimal. In this paper, we propose a novel coding scheme based on fountain codes, which combines the separate coding...

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Bibliographic Details
Published in2009 IEEE Information Theory Workshop pp. 445 - 449
Main Authors Xiaoying Shao, Slump, C.H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2009
Subjects
Conferences
Error correction codes
Fading
Forward error correction
Information theory
Interference
OFDM
Throughput
Wireless LAN
Working environment noise
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Summary:In wireless OFDM-based systems, coding jointly over all the sub-carriers simultaneously performs better than coding separately per sub-carrier. However, the joint coding is not always optimal. In this paper, we propose a novel coding scheme based on fountain codes, which combines the separate coding and the joint coding over all the sub-carriers. The key element in the new proposed system is that each fountain-encoded packet is transmitted over a single sub-carrier. The packets can be discarded if they have encountered a low-energy channel. Fountain codes can recover the source data by using only the surviving packets. With this new approach, we have a gain of around 8.5 dB comparing to the FEC layer used in current WLAN standards (i.e. the IEEE 802.11a standard and the IEEE 802.11n standard).
ISBN:9781424449828
1424449820
DOI:10.1109/ITW.2009.5351209