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Carrier Aggregation (CA) has been proposed as a key feature of the 4G cellular networks to achieve the very high data rates. It is known that the correlation between the subchannels, including both small- and large-scale fading, is critical in determining the performance gain the authors can obtain from the multicarrier transmission. However, due to the prohibitively high complexity and cost in simultaneously probing multiple non-contiguous subchannels by a channel sounder, this issue is less explored yet. In this paper, they develop an analytical model to study the correlation of the Small-Scale Fading (SSF) between two arbitrarily separated subchannels.
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