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This paper investigates the optimum radio parameters, i.e., numerology, in Layered Orthogonal Frequency Division Multiple Access (OFDMA) for Long-Term Evolution (LTE)- Advanced. Similar to the Layered OFDMA concept, it was agreed at the 3GPP RAN WG1 meeting that the entire transmission bandwidth in LTE-Advanced should comprise-multiple frequency blocks called component carriers to achieve a wider system bandwidth than that for the current LTE (Rel-8 LTE). The authors investigate the optimum radio parameters in the frequency domain including the need for an inter-component carrier Guard Band (GB). In the simulation evaluations, they set the parameters for the receiver filter assuming the worst case that satisfies the minimum-requirement specified in Rel-8 LTE.
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