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In this article,we propose a cyclic delay diversity(CDD)transmission scheme for unique word(UW)OFDM system,which is denoted as CDD-UW-OFDM.In our proposed CDD-UW-OFDM system,the first transmit antenna transmits a UW-OFDM and then,for every UW-OFDM block,the i-th transmit antenna transmits a cyclically delayed version of the symbols transmitted at the first transmit antenna.With this proposed CDD-OFDM system,each antenna transmission is a UW-OFDM.Also,at the receiver under a certain condition on the cyclic delay amounts,the received signal is equivalent to that of a single transmit antenna UW-OFDM transmission with a longer multipath channel.We design the lengths of UW and cyclic delays to achieve the full multipath and spatial diversities for the CDD-UW-OFDM system when the linear MMSE receiver is used.We then present some simulation results to illustrate the claimed performance of the proposed system.
In this article, we propose a cyclic delay diversity (CDD) transmission scheme for unique word (UW) OFDM system, which is denoted as CDD-UW- OFDM. Our proposed CDD-UW-OFDM system, the first transmit antenna transmission a UW-OFDM and then, for every UW-OFDM block, the i-th transmit antenna transmits a cyclically delayed version of the symbols transmitted at the first transmit antenna. Since this proposed CDD-OFDM system, each antenna transmission is a UW-OFDM .Also, at the receiver under a certain condition on the cyclic delay amounts, the received signal is equivalent to that of a single transmit antenna UW-OFDM transmission with a longer multipath channel. We design the lengths of UW and cyclic delays to achieve the full multipath and spatial diversities for the CDD-UW-OFDM system when the linear MMSE receiver is used. We then present some simulation results to illustrate the claimed performance of the proposed system.