Title :
Robust EM-based detection of BICM-OFDM transmissions in the presence of narrowband interference
Author :
Sanguinetti, Luca ; Morelli, Michele ; Poor, H. Vincent
Author_Institution :
Dept. of Inf. Eng., Univ. of Pisa, Pisa, Italy
Abstract :
Future wireless communications systems are expected to coexist with different commercial applications over the same frequency bands. This gives rise to co-channel interference, which strongly affects the error-rate performance. In this work, an orthogonal frequency-division multiplexing system with bit-interleaved coded-modulation is considered and the problem of data detection in the presence of unknown narrowband interference (NBI) is addressed. In particular, an iterative detector that operates according to the expectation-maximization algorithm is derived under the assumption that the interference power on each subcarrier can be modeled as a random variable with an inverse gamma distribution. Computer simulations indicate that the proposed solution is remarkably robust to NBI and outperforms existing alternatives in severe interference environments.
Keywords :
OFDM modulation; cochannel interference; expectation-maximisation algorithm; modulation coding; radiocommunication; signal detection; BICM-OFDM transmissions; bit-interleaved coded-modulation; cochannel interference; computer simulations; data detection; expectation-maximization algorithm; inverse gamma distribution; iterative detector; narrowband interference; orthogonal frequency-division multiplexing system; robust EM-based detection; wireless communications systems; Expectation-maximization algorithms; Frequency division multiplexing; Gamma ray detection; Gamma ray detectors; Interchannel interference; Narrowband; Power system modeling; Random variables; Robustness; Wireless communication;
Conference_Titel :
Wireless Conference (EW), 2010 European
Conference_Location :
Lucca
Print_ISBN :
978-1-4244-5999-5
DOI :
10.1109/EW.2010.5483414