TY - GEN
T1 - Cancellation and error correction for narrowband interference with spectral nulls codes and OFDM modulation
AU - Ouahada, K.
AU - Ferreira, H. C.
AU - Vinck, A. J.Han
AU - Snyders, A. J.
AU - Swart, T. G.
PY - 2007
Y1 - 2007
N2 - Distance Preserving Mappings (DPM) is a relatively new technique finding its way to a wide use in the coding field. New codes mapping convolutional code outputs onto spectral nulls codewords have the purpose of generating a code with a certain spectrum specification and error correction capabilities, which can be exploited by the Viterbi decoder. Combining this class of new codes with an OFDM modulation scheme is actually a tool to reduce Electromagnetic Compatibility Interference (EMC) in selected subbands or to cancel the narrowband interference (NBI) potentially caused by, amongst others, HF radio transmissions. Taking into consideration the fact that a narrowband noise source is almost similar to a modulated OFDM carrier, and also the periodicity of the nulls in our spectrum, we are able to cancel the narrowband signal and its sideband interferences without using traditional techniques of cancellation, which is based on filtering. Shaping our spectrum at the transmitter is a technique, which can be exploited at the receiver to suppress any narrowband signal interference, which is regarded as noise. We will present in this paper the technique of cancellation and the coding gain that can be obtained when comparing to the uncoded data.
AB - Distance Preserving Mappings (DPM) is a relatively new technique finding its way to a wide use in the coding field. New codes mapping convolutional code outputs onto spectral nulls codewords have the purpose of generating a code with a certain spectrum specification and error correction capabilities, which can be exploited by the Viterbi decoder. Combining this class of new codes with an OFDM modulation scheme is actually a tool to reduce Electromagnetic Compatibility Interference (EMC) in selected subbands or to cancel the narrowband interference (NBI) potentially caused by, amongst others, HF radio transmissions. Taking into consideration the fact that a narrowband noise source is almost similar to a modulated OFDM carrier, and also the periodicity of the nulls in our spectrum, we are able to cancel the narrowband signal and its sideband interferences without using traditional techniques of cancellation, which is based on filtering. Shaping our spectrum at the transmitter is a technique, which can be exploited at the receiver to suppress any narrowband signal interference, which is regarded as noise. We will present in this paper the technique of cancellation and the coding gain that can be obtained when comparing to the uncoded data.
UR - http://www.scopus.com/inward/record.url?scp=48649109000&partnerID=8YFLogxK
U2 - 10.1109/AFRCON.2007.4401559
DO - 10.1109/AFRCON.2007.4401559
M3 - Conference contribution
AN - SCOPUS:48649109000
SN - 142440987X
SN - 9781424409877
T3 - IEEE AFRICON Conference
BT - IEEE AFRICON 2007
T2 - IEEE AFRICON 2007
Y2 - 26 September 2007 through 28 September 2007
ER -