Capacity optimization of cyclic delay diversity

We derive the capacity of cyclic delay diversity with Gaussian as well as PSK/QAM transmit symbols in OFDM. The impact of the chosen cyclic delays on the capacity is analyzed. Particularly, it is shown that the optimum cyclic delays depend on code rate, channel memory and the FFT size but not on the modulation alphabet. We compare the capacity of cyclic delay diversity and orthogonal space-time block codes. Furthermore, we show that capacity gains over single transmit antenna systems are possibles even in relatively strong frequency-selective channels.

[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]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[3]  Harald Haas,et al.  On space-frequency coding using cyclic delay diversity for OFDM-based transmission systems , 2003, Eur. Trans. Telecommun..

[4]  A. Robert Calderbank,et al.  Space-Time block codes from orthogonal designs , 1999, IEEE Trans. Inf. Theory.

[5]  G. Bauch,et al.  Parameter optimization, interleaving and multiple access in OFDM with cyclic delay diversity , 2004, 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514).

[6]  Armin Dammann,et al.  Low Complex Standard Conformable Antenna Diversity Techniques for OFDM Systems and its Application to the DVB-T System , 2002 .

[7]  Armin Dammann,et al.  Beamforming in combination with space-time diversity for broadband OFDM systems , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[8]  Gerhard Bauch MIMO capacity loss for real world signal constellations and channel degradations , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).

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

[10]  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).

[11]  Gerhard Bauch,et al.  Turbo processing in transmit antenna diversity systems , 2001, Ann. des Télécommunications.

[12]  Thomas M. Cover,et al.  Elements of Information Theory , 2005 .

[13]  Arogyaswami Paulraj,et al.  Space-time block codes: a capacity perspective , 2000, IEEE Communications Letters.