Signal Detection for Space-Frequency Coded Cooperative Communication System with Multiple Carrier Frequency Offsets

To combat synchronization errors in cooperative communication, paper (Li, 2006) applied the orthogonal frequency division multiplexing (OFDM) technique to achieve full cooperative diversity and full multipath diversity for asynchronous cooperative communications, where a kind of high rate space-frequency (SF) codes was used at relay nodes. However, OFDM is very sensitive to carrier frequency offset (CFO). For conventional communication system, only one CFO exists and its effect is easy to be compensated. But for cooperative communication, the CFO between each relay and destination may be very different. These multiple CFO make frequency compensation difficult if not impossible. To solve this problem, we propose a detection scheme for SF codes which can work much better than the conventional SISO zero-forcing (ZF) and minimum mean square error (MMSE) methods. Moreover, parallel interference cancellation (PIC) can be used to further improve the system performance. Simulation results show that the proposed scheme combined with PIC is capable to achieve almost the same performance as cases without CFO.

[1]  A. G. Burr,et al.  Signal Detection for Orthogonal Space-Time Block Coding Over Time-Selective Fading Channels: A PIC Approach for the Systems , 2005 .

[2]  Elza Erkip,et al.  User cooperation diversity. Part I. System description , 2003, IEEE Trans. Commun..

[3]  Guangxi Zhu,et al.  An equalization technique for distributed stbc-ofdm system with multiple carrier frequency offsets , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[4]  Ananthram Swami,et al.  Combating synchronization errors in cooperative relays , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[5]  Dennis Goeckel,et al.  Asynchronous cooperative diversity , 2006, IEEE Transactions on Wireless Communications.

[6]  F. Zheng,et al.  Space-time block coding for four transmit antennas over time-selective fading channels: orthogonal or non-orthogonal design? , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[7]  Suhas N. Diggavi,et al.  Intercarrier interference in MIMO OFDM , 2002, IEEE Trans. Signal Process..

[8]  Alister G. Burr,et al.  Signal detection for orthogonal space-time block coding over time-selective fading channels: a PIC approach for the G/sub i/ systems , 2005, IEEE Transactions on Communications.

[9]  Shuangqing Wei,et al.  Diversity–Multiplexing Tradeoff of Asynchronous Cooperative Diversity in Wireless Networks , 2007, IEEE Transactions on Information Theory.

[10]  Jean Armstrong,et al.  Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM , 1999, IEEE Trans. Commun..

[11]  Elza Erkip,et al.  User cooperation diversity. Part II. Implementation aspects and performance analysis , 2003, IEEE Trans. Commun..

[12]  Xiang-Gen Xia,et al.  Distributive High-Rate Full-Diversity Space-Frequency Codes for Asynchronous Cooperative Communications , 2006, 2006 IEEE International Symposium on Information Theory.