Science China Information Sciences

, Volume 57, Issue 8, pp 1–9 | Cite as

Cyclic delay transmission for unique word OFDM systems

Research Paper
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Abstract

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.

Keywords

MIMO-OFDM systems frequency-selective fading channels cyclic delay diversity (CDD) unique word (UW) transmit diversity 
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Supplementary material

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.School of Electronic Information EngineeringBeihang UniversityBeijingChina
  2. 2.Department of Electrical and Computer EngineeringUniversity of DelawareNewarkUSA

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