�ber regul�re und irregul�re Dubletts

Constrained minimum-BER multiuser detection

A new linear multiuser detector that directly minimizes the bit-error rate (BER) subject to a set of reasonable constraints is proposed. It is shown that the constrained BER cost function has a unique global minimum. This allows us to develop an efficient barrier Newton method for finding the coefficients of the proposed detector using information about timing, amplitudes, channels, and the sig...

BER Analysis for MC-CDMA

As demand for higher data rates is continuously rising, there is always a need to develop more efficient wireless communication systems. Efficient use of the spectrum is an essential problem in creating any multi-user cellular mobile system. The bandwidth requirements of the future 4G systems far exceed what the existing traditional setup can provide. A more creative utilization of the availabl...

Torsion in Milnor ber homology

In a recent paper, Dimca and N emethi pose the problem of nding a homogeneous polynomial f such that the homology of the complement of the hypersurface de ned by f is torsion-free, but the homology of the Milnor ber of f has torsion. We prove that this is indeed possible, and show by construction that, for each prime p , there is a polynomial with p-torsion in the homology of the Milnor ber. Th...

BER Estimation for HiperLAN/2

This paper presents a method to estimate the bit error rate (BER) of the wireless channel based on statistical analysis of the soft output of the receiver only. In HiperLAN/2 several modulation schemes can be used. The system should select the most suitable modulation scheme dependent on the quality of the wireless link and the Quality of Service requirements of the user. Our BER estimation met...

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