In this paper a Raptor code is developed and applied in an opportunistic error correction (OEC) layer for Coded OFDM systems. Opportunistic error correction  tries to recover information when it is available with the least effort. This is achieved by using Fountain codes in a COFDM system, which means that each subcarrier contains a Fountain coded packet. The property of a Fountain code that any missing packet can be replaced by any other packet allows the receiver to discard packets with low SNR. As a result ADC resolution and therefore energy consumption can be reduced. In this paper the possibilities of using Raptor codes in an OEC system are investigated. Raptor codes are a type of Fountain codes with an efficient encoding and decoding algorithm. By simulating an OEC system on a wireless indoor channel model, it is shown that Raptor codes can save up to 70% in energy consumption with respect to a traditional system. Furthermore it is found that a feedback channel can reduce energy consumption even more. In this setting 85% of energy consumption can be saved.
|Publication status||Published - 2010|
|Event||31st WIC Symposium on Information Theory in the Benelux 2010 - Rotterdam, Netherlands|
Duration: 11 May 2010 → 12 May 2010
Conference number: 31
|Conference||31st WIC Symposium on Information Theory in the Benelux 2010|
|Period||11/05/10 → 12/05/10|