A Robust Cross Coding Scheme for OFDM Systems

X. Shao; Cornelis H. Slump

doi:10.1109/ISITA.2010.5648991

A Robust Cross Coding Scheme for OFDM Systems

X. Shao, Cornelis H. Slump

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

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 because its achievable channel capacity (i.e. the maximum data rate) is inversely proportional to the dynamic range of the channel. In this paper, we propose a novel cross coding scheme to increase the maximum data rate (i.e. the noise floor) achieved in frequency selective channels. The proposed OEC-II is based on fountain codes. The key element in OEC-II is to exchange the modulation order with the discarded subcarriers. In such case, the system can increase the noise floor by only taking care of the sub-carriers with high energy. By transmitting a fountain-encoded packet 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 only using the surviving packets. With the same effective transmission data rate (i.e. 10.8 Mbits/s), OEC-II with QAM-16 has a SNR gain of around 7 dB over the FEC layer from the IEEE 802.11a standard, around 8 dB over the FEC layer from the IEEE 802.11n standard, around 7 dB over OEC-II with QPSK and around 3 dB over OEC-II with QAM-64.

Original language	Undefined
Title of host publication	Proceedings of the International Symposium on Information Theory and its Applications, ISITA 2010
Place of Publication	USA
Publisher	IEEE
Pages	282-287
Number of pages	6
ISBN (Print)	978-1-4244-6016-8
DOIs	https://doi.org/10.1109/ISITA.2010.5648991
Publication status	Published - Oct 2010
Event	International Symposium on Information Theory and its Applications, ISITA 2010 - Taichung, Taiwan Duration: 17 Oct 2010 → 20 Oct 2010

Publication series

Name
Publisher	IEEE Computer Society

Conference

Conference	International Symposium on Information Theory and its Applications, ISITA 2010
Period	17/10/10 → 20/10/10
Other	17-20 October 2010

Keywords

IR-75555
EWI-18860
METIS-275708

Access to Document

10.1109/ISITA.2010.5648991

Cite this

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title = "A Robust Cross Coding Scheme for OFDM Systems",

abstract = "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 because its achievable channel capacity (i.e. the maximum data rate) is inversely proportional to the dynamic range of the channel. In this paper, we propose a novel cross coding scheme to increase the maximum data rate (i.e. the noise floor) achieved in frequency selective channels. The proposed OEC-II is based on fountain codes. The key element in OEC-II is to exchange the modulation order with the discarded subcarriers. In such case, the system can increase the noise floor by only taking care of the sub-carriers with high energy. By transmitting a fountain-encoded packet 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 only using the surviving packets. With the same effective transmission data rate (i.e. 10.8 Mbits/s), OEC-II with QAM-16 has a SNR gain of around 7 dB over the FEC layer from the IEEE 802.11a standard, around 8 dB over the FEC layer from the IEEE 802.11n standard, around 7 dB over OEC-II with QPSK and around 3 dB over OEC-II with QAM-64.",

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AU - Slump, Cornelis H.

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PY - 2010/10

Y1 - 2010/10

N2 - 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 because its achievable channel capacity (i.e. the maximum data rate) is inversely proportional to the dynamic range of the channel. In this paper, we propose a novel cross coding scheme to increase the maximum data rate (i.e. the noise floor) achieved in frequency selective channels. The proposed OEC-II is based on fountain codes. The key element in OEC-II is to exchange the modulation order with the discarded subcarriers. In such case, the system can increase the noise floor by only taking care of the sub-carriers with high energy. By transmitting a fountain-encoded packet 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 only using the surviving packets. With the same effective transmission data rate (i.e. 10.8 Mbits/s), OEC-II with QAM-16 has a SNR gain of around 7 dB over the FEC layer from the IEEE 802.11a standard, around 8 dB over the FEC layer from the IEEE 802.11n standard, around 7 dB over OEC-II with QPSK and around 3 dB over OEC-II with QAM-64.

AB - 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 because its achievable channel capacity (i.e. the maximum data rate) is inversely proportional to the dynamic range of the channel. In this paper, we propose a novel cross coding scheme to increase the maximum data rate (i.e. the noise floor) achieved in frequency selective channels. The proposed OEC-II is based on fountain codes. The key element in OEC-II is to exchange the modulation order with the discarded subcarriers. In such case, the system can increase the noise floor by only taking care of the sub-carriers with high energy. By transmitting a fountain-encoded packet 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 only using the surviving packets. With the same effective transmission data rate (i.e. 10.8 Mbits/s), OEC-II with QAM-16 has a SNR gain of around 7 dB over the FEC layer from the IEEE 802.11a standard, around 8 dB over the FEC layer from the IEEE 802.11n standard, around 7 dB over OEC-II with QPSK and around 3 dB over OEC-II with QAM-64.

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