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A complex orthogonal design (COD) with parameter $[p, n, k]$ is a combinatorial design used in space-time block codes (STBCs). For STBCs, $n$ is the number of antennas, $k/p$ is the rate, and $p$ is the decoding delay. A class of rate $1/2$ CODs called balanced complex orthogonal designs (BCODs) has been proposed by Adams et al., who constructed BCODs with rate $k/p = 1/2$ and decoding...
Let P be a fixed graph (hereafter called a "pattern"), and let Subgraph(P) denote the problem of deciding whether a given graph G contains a subgraph isomorphic to P. We are interested in AC0-complexity of this problem, determined by the smallest possible exponent C(P) for which Subgraph(P) possesses bounded-depth circuits of size nC(P)+o(1). Motivated by the previous research in the area,...
In this paper, a correlation-based clustering hierarchical P2P network model is proposed,which overcomes the problems of poor scalability and low search efficiency in unstructured P2P networks.This model devides the whole unstructured P2P network into clusters formed by a number of nodes through correlation.Each cluster elects a master node to be responsible for managing the entire cluster.The whole...
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