Cyclic delay transmission for unique word OFDM systems

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.

[1]  Arogyaswami Paulraj,et al.  Delay diversity codes for frequency selective channels , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[2]  Xiang-Gen Xia,et al.  Space-Time/Frequency Coding for MIMO-OFDM in Next Generation Broadband Wireless Systems , 2007, IEEE Wireless Communications.

[3]  K. J. Ray Liu,et al.  Obtaining full-diversity space-frequency codes from space-time codes via mapping , 2003, IEEE Trans. Signal Process..

[4]  Helmut Bölcskei,et al.  Space-frequency coded broadband OFDM systems , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).

[5]  Huiming Wang,et al.  Cyclic-delay time-reversal space-time block codes for single-carrier transmission with frequency-domain decision-feedback equalization , 2011, Science China Information Sciences.

[6]  Heidi Steendam.  The Quasi-Uniform Redundant Carrier Placement for UW-OFDM , 2012, 2012 IEEE Vehicular Technology Conference (VTC Fall).

[7]  Sailes K. Sengijpta.  Fundamentals of Statistical Signal Processing: Estimation Theory , 1995 .

[8]  Mario Huemer,et al.  Classical and Bayesian Linear Data Estimators for Unique Word OFDM , 2011, IEEE Transactions on Signal Processing.

[9]  Yuan Li,et al.  Transmit Diversity Schemes for MIMO-OFDM Based Wireless Lan Systems , 2006, 2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications.

[10]  Sync TGn.  TGn Sync Proposal Technical Specification , 2004 .

[11]  Qinye Yin,et al.  Pilot-aided channel estimation for CDD-OFDM systems , 2010, Science China Information Sciences.

[12]  Harald Haas,et al.  On Cyclic Delay Diversity in OFDM Based Transmission Schemes , 2002 .

[13]  Hamid Aghvami,et al.  Performance comparison of space-time block coded and cyclic delay diversity MC-CDMA systems , 2005, IEEE Wireless Communications.

[14]  Guillem Femenias,et al.  Enhancing IEEE 802.11n WLANs using group-orthogonal code-division multiplex , 2007, PWC.

[15]  Mario Huemer,et al.  Unique word based phase tracking algorithms for SC/FDE-systems , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[16]  Aria Nosratinia,et al.  Cyclic delay transmission achieves full diversity without (Pre)coding , 2012, 2012 IEEE International Conference on Communications (ICC).

[17]  J. Huber,et al.  The Potential of Unique Words in OFDM , 2010 .

[18]  Mario Huemer,et al.  Non-Systematic Complex Number RS Coded OFDM by Unique Word Prefix , 2012, IEEE Transactions on Signal Processing.

[19]  Mario Huemer,et al.  Coded OFDM by unique word prefix , 2010, 2010 IEEE International Conference on Communication Systems.

[20]  Mario Huemer,et al.  Direct vs. Two-Step Approach for Unique Word Generation in UW-OFDM , 2010, ArXiv.

[21]  Xiang-Gen Xia,et al.  Full-Diversity and Fast ML Decoding Properties of General Orthogonal Space-Time Block Codes for MIMO-OFDM Systems , 2007, IEEE Transactions on Wireless Communications.

[22]  Armin Dammann,et al.  Standard conformable antenna diversity techniques for OFDM and its application to the DVB-T system , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).