An Opportunistic Error Correction Layer for OFDM Systems


Shao, Xiaoying and Schiphorst, Roel and Slump, Cornelis H. (2009) An Opportunistic Error Correction Layer for OFDM Systems. EURASIP Journal on Wireless Communications and Networking, 2009 (2009). p. 750735. ISSN 1687-1499

Abstract:In this paper, we propose a novel cross layer scheme to lower power
consumption of ADCs in OFDM systems, which is based on resolution
adaptive ADCs and Fountain codes. The key part in the new proposed
system is that the dynamic range of ADCs can be reduced by
discarding the packets which are transmitted over 'bad' sub
carriers. Correspondingly, the power consumption in ADCs can be
reduced. Also, the new system does not process all the packets but
only processes surviving packets. This new error correction layer
does not require perfect channel knowledge, so it can be used in a
realistic system where the channel is estimated. With this new
approach, more than 70% of the energy consumption in the ADC can be
saved compared with the conventional IEEE 802.11a WLAN system under
the same channel conditions and throughput. The ADC in a receiver
can consume up to 50% of the total baseband energy. Moreover, to
reduce the overhead of Fountain codes, we apply message passing and
Gaussian elimination in the decoder. In this way, the overhead is
3% for a small block size (i.e. 500 packets). Using both methods
results in an efficient system with low delay.
Item Type:Article
Copyright:© 2009 The Authors
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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