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A major drawback of orthogonal frequency division multiplexing (OFDM) signals is the high value of peak to average power ratio (PAPR). Partial transmit sequences (PTS) is a popular PAPR reduction method with good PAPR reduction performance, but its search complexity is high. In this paper, in order to reduce PTS search complexity we propose a new technique based on biogeography-based optimization (BBO). More specifically, we present a new Generalized Oppositional Biogeography Based Optimization...
The research on the robust principal component analysis has been attracting much attention recently. Generally, the model assumes sparse noise and characterizes the error term by the -norm. However, the sparse noise has clustering effect in practice so using a certain -norm simply is not appropriate for modeling. In this paper, we propose a novel method based on sparse Bayesian learning principles and Markov random fields. The method is proved to be very effective for low-rank matrix recovery...
We describe a technique that maps unranked trees to arbitrary hash
codes using a bottom-up deterministic tree automaton (DTA). In
contrast to other hashing techniques based on automata, our
procedure builds a pseudo-minimal DTA for this purpose. A
pseudo-minimal automaton may be larger than the minimal one
accepting the same language but, in turn, it contains proper
elements (states or transitions which are unique) for every input
accepted by the automaton. Therefore, pseudo-minimal DTA...
Suppose ƒ : X* → X* is a morphism and u,v ∈ X*. For every nonnegative integer n, let zn be the longest common
prefix of ƒn(u) and ƒn(v), and let un,vn ∈ X* be words such
that ƒn(u) = znun and ƒn(v) = znvn. We prove that there is a positive
integer q such that for any positive integer p, the prefixes of un
(resp. vn) of length p form an ultimately periodic sequence having period
q. Further, there is a value of q which works for all words u,v ∈ X*.
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