| 摘要 |
PURPOSE: A cooperative communications system and an OFDM s symbol transmission method thereof are provided to prevent serious bit error rate performance degradation of data decoding due to the time synchronization error of a relay node by inserting a new cyclic prefix symbol. CONSTITUTION: Four OFDM(Orthogonal Frequency Division Multiplexing) blocks which are expressed one OFDM block as imaginary number double of a conjugate complex number of the other OFDM block are created by mixing successive two OFDM blocks in a source node. Time domain OFDM blocks are created by executing inverse discrete Fourier transform to the four OFDM blocks. A transmission OFDM symbols are created by inserting a first cyclic prefix symbol to the time domain OFDM blocks. The transmission OFDM symbols are transmitted to a plurality of relaying nodes. A plurality of relaying nodes creates encoded electrical transmission OFDM symbols.
|
