Gerhard Keller

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— In previous research, we considered SSMA (spread spectrum multiple access) communication systems using spreading sequences of Markov chains and pointed out that the theoretical evaluations of bit error probabilities in such systems based on the SGA (standard Gaussian approximation) is rather optimistic comparing with those based on the CLT (central limit(More)
We consider families of dynamics that can be described in terms of Perron-Frobenius operators with exponential mixing properties. For piecewise C 2 expanding interval maps we rigorously prove continuity properties of the drift J(λ) and of the diffusion coefficient D(λ) under parameter variation. Our main result is that D(λ) has a modulus of continuity of(More)
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