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The work proposes two novel spreading codes, called extensive double-orthogonal code (EDOC) and flexible paired-orthogonal code (FPOC), for multi-user downlink multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The goal of code designs is to obtain an improved bit error rate (BER) performance without loss of bandwidth efficiency. The code designs achieve...
An ethernet-passive-optical-network consists of one optical-line-terminator and multiple optical-network-units with passive optical components. The network is susceptible to variable security threats. In this paper we propose a security model and an encryption layer placed at reconciliation sublayer. We also propose advanced encryption standard as an ideal cipher algorithm to encrypt downstream data...
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