OFCDM: a promising broadband wireless access technique

Future mobile communication systems aim to provide extremely high-speed data transmission, especially in the downlink. The broadband orthogonal frequency- and code-division multiplexing system with two-dimensional spreading (time and frequency domain spreading) is becoming a very promising technique for highspeed wireless communications due to its advantages over OFDM. This article presents the basic structure and main functions of the OFCDM system. A nonsequential code assignment scheme is introduced. The novel detection method for the OFCDM, called hybrid multi-code interference cancellation and minimum mean square error detection, is described. The application of advanced techniques to the OFCDM, such as turbo coding and MIMO, is also discussed. It is shown in this article that OFCDM is superior to OFDM.

[1]  Mamoru Sawahashi,et al.  Downlink transmission of broadband OFCDM systems-part III: turbo-coded , 2006, IEEE Journal on Selected Areas in Communications.

[2]  Hiroyuki Kawai,et al.  Adaptive selection of surviving symbol replica candidates based on maximum reliability in QRM-MLD for OFCDM MIMO multiplexing , 2004, IEEE Global Telecommunications Conference, 2004. GLOBECOM '04..

[3]  Fumiyuki Adachi,et al.  1.92 Mbps data transmission experiments over a coherent W-CDMA mobile radio link , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[4]  Fumiyuki Adachi,et al.  Experimental Evaluation of Coherent Rake Combining for Broadband Single-Carrier DS-CDMA Wireless Communications , 2001 .

[5]  Tung-Sang Ng,et al.  Downlink Transmission of Broadband OFCDM Systems-Part V: Code Assignment , 2008, IEEE Transactions on Wireless Communications.

[6]  Fumiyuki Adachi,et al.  Wideband DS-CDMA for next-generation mobile communications systems , 1998, IEEE Commun. Mag..

[7]  Yiqing Zhou,et al.  Downlink transmission of broadband OFCDM systems-part IV: soft decision , 2006, IEEE Journal on Selected Areas in Communications.

[8]  Fumiyuki Adachi,et al.  1.92 Mbps Data Transmission Experiments over a Coherent W-CDMA Radio Link , 1998 .

[9]  Mamoru Sawahashi,et al.  Downlink transmission of broadband OFCDM Systems-part I: hybrid detection , 2005, IEEE Transactions on Communications.

[10]  H. Atarashi,et al.  Broadband packet wireless access appropriate for high-speed and high-capacity throughput , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[11]  H. Atarashi,et al.  Transmission performance analysis of VSF-OFCDM broadband packet wireless access based on field experiments in 100-MHz forward link , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.