�ber Farbenreaktionen des Narze�ns

Modified - DES and Triple Modified - DES Encryption Algorithm with Reduced BER in Wireless Communication

In this paper, we propose a modification to the existing Data Encryption Standard (DES) to make it secure and prone to the bit errors caused by the wireless channel. We observe that using the modified algorithm in wireless channels, improves the bit error rate (BER) performance as well as security compared to DES. Wireless channels are an open medium to intruders and their attacks; encryption i...

Etude sur l'Agalaxic contagieuse des chèvres et des moutons

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...