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mode selection and subcarrier assignment.
In [7], the authors considered relay selection and subcarrier assignment for cooperative OFDMA systems.
Joint relay selection and subcarrier assignment were considered in OFDMA D2D communication in [17].
When imperfect CSI is assumed, the closed-form expressions of optimal power allocation, relay selection, and subcarrier pairing are derived.
The optimization problem for joint relay selection and subcarrier allocation in cooperative OFDMA networks can be formulated as following [2].
The complexity of solving problem of relay selection and subcarrier pairing at two hops is (mathcal {O} KN^{2})).
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Other PAPR reduction algorithms have been developed specifically for MC-CDMA signals, such as spreading code selection [16 18] and subcarrier scrambling [19].
In addition, ω i and (rho _{i}^{m,n}) are defined as the relay selection indicator and subcarrier pairing indicator, respectively, i.e., omega_{i} = left{ begin{array}{ll} 1, &text{if ({RN}_{i}) is selected,} 0, &text{otherwise.} end{array}right.
Let τ i and ρ i (n be the relay selection indicator variable and subcarrier assignment indicator variable on n th subcarrier, respectively, where τ i = 1, when R i is selected to patriciate in transmission 0, otherwise (3).
In [19] and [20], the authors studied the joint optimization problem of subcarrier-pairing-based relay selection, relay power allocation, and subcarrier assignment, where however, the network coding was not taken into account.
This involves a careful design and coordination of the power and subcarrier allocation, selection of relay(s) across different hops.
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