we considered a multi-carrier asynchronous bidirectional relay network, where different relay-transceiver links can cause different delays in the signals relayed by different relays, thereby producing inter-symbol-interference at the two transceivers. Such a two-way relay link can be modeled as a frequency selective channel with multiple taps, and thus, it can be equalized using orthogonal frequency division multiplexing (OFDM) transmission and reception schemes at the two transceivers, while the relay use simple amplify-and-forward relaying protocol....
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