Fredy Neeser - Academia.edu (original) (raw)
Papers by Fredy Neeser
The complexity of channel equalization using the BCJR algorithm grows exponentially with the chan... more The complexity of channel equalization using the BCJR algorithm grows exponentially with the channel memory and signal cardinality. In this paper we present a novel reduced complexity equalization algorithm where independent forward and backward trellises are formed based on decision feedback sequence estimation (DFSE) idea. Performance of the new equalizer algorithm is evaluated for turbo equalization of the EDGE (Enhanced Data rate for GSM Evolution) system. We also consider the effect of delayed APP calculation on BER performance and show that BER performance can be improved by choosing a proper delay value depending on the channel impulse response.
The "covariance" of complex random variables and processes, when defined consistently w... more The "covariance" of complex random variables and processes, when defined consistently with the corresponding notion for real random variables, is shown to be determined by the usual (complex) covariance together with a quantity called the pseudo-covariance. A characterization of uncorrelatedness and wide-sense stationarity in terms of covariance and pseudo- covariance is given. Complex random variables and processes with a vanishing
Proceedings of the tenth ACM/IEEE symposium on Architectures for networking and communications systems - ANCS '14, 2014
The complexity of channel equalization using the BCJR algorithm grows exponentially with the chan... more The complexity of channel equalization using the BCJR algorithm grows exponentially with the channel memory and signal cardinality. In this paper we present a novel reduced complexity equalization algorithm where independent forward and backward trellises are formed based on decision feedback sequence estimation (DFSE) idea. Performance of the new equalizer algorithm is evaluated for turbo equalization of the EDGE (Enhanced Data rate for GSM Evolution) system. We also consider the effect of delayed APP calculation on BER performance and show that BER performance can be improved by choosing a proper delay value depending on the channel impulse response.
The "covariance" of complex random variables and processes, when defined consistently w... more The "covariance" of complex random variables and processes, when defined consistently with the corresponding notion for real random variables, is shown to be determined by the usual (complex) covariance together with a quantity called the pseudo-covariance. A characterization of uncorrelatedness and wide-sense stationarity in terms of covariance and pseudo- covariance is given. Complex random variables and processes with a vanishing
Proceedings of the tenth ACM/IEEE symposium on Architectures for networking and communications systems - ANCS '14, 2014