Double-Differential Encoding for Dual-Hop Amplify-and-Forward Relaying in IR-UWB Systems

In this paper, we propose to improve the performance of impulse-radio ultra-wideband (IR-UWB) systems by means of cooperative relaying. With regard to a simple practical realization, we focus on a non-coherent system setup in conjunction with amplify-and-forward (A&F) relaying. In particular, considering a two-hop scenario we propose to employ a double-differential encoding scheme at the source node and single differential decoding at the relay and the destination node, respectively, so as to efficiently limit intersymbol-interference (ISI) effects. A thorough performance analysis of the proposed scheme is provided, along with a closed-form optimization of the transmit power allocation between source and relay. Simulation results illustrate the excellent performance of the proposed scheme, which is compared to alternative coherent and non-coherent schemes based on A&F relaying and decode-and-forward (D&F) relaying.

[1]  Moe Z. Win,et al.  Performance of low-complexity RAKE reception in a realistic UWB channel , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[2]  J. Nicholas Laneman,et al.  Cooperative diversity in wireless networks: algorithms and architectures , 2002 .

[3]  Andreas F. Molisch,et al.  Channel models for ultrawideband personal area networks , 2003, IEEE Wireless Communications.

[4]  Ning He,et al.  Performance analysis of non-coherent UWB receivers at different synchronization levels , 2004, IEEE Global Telecommunications Conference, 2004. GLOBECOM '04..

[5]  J. Romme,et al.  Transmit reference impulse radio systems using weighted correlation , 2004, 2004 International Workshop on Ultra Wideband Systems Joint with Conference on Ultra Wideband Systems and Technologies. Joint UWBST & IWUWBS 2004 (IEEE Cat. No.04EX812).

[6]  Huaping Liu,et al.  A decision-feedback autocorrelation receiver for pulsed ultra-wideband systems , 2004, Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746).

[7]  Dariush Divsalar,et al.  On the implementation and performance of single and double differential detection schemes , 1992, IEEE Trans. Commun..

[8]  Moe Z. Win,et al.  On the energy capture of ultrawide bandwidth signals in dense multipath environments , 1998, IEEE Communications Letters.

[9]  R. Schober,et al.  Enhancement of the ECMA-368 UWB system by means of compatible relaying techniques , 2008, 2008 IEEE International Conference on Ultra-Wideband.

[10]  Zhu Han,et al.  Employing cooperative diversity for performance enhancement in UWB communication systems , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[11]  Georgios B. Giannakis,et al.  Ultra-wideband communications: an idea whose time has come , 2003, 2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications - SPAWC 2003 (IEEE Cat. No.03EX689).

[12]  John G. Proakis,et al.  Digital Communications , 1983 .

[13]  R M Morey,et al.  Response to FCC 98-208 notice of inquiry in the matter of revision of part 15 of the commission's rules regarding ultra-wideband transmission systems , 1998 .

[14]  Moe Z. Win,et al.  Impulse radio: how it works , 1998, IEEE Communications Letters.

[15]  Nan Guo,et al.  Improved autocorrelation demodulation receivers based on multiple-symbol detection for UWB communications , 2006, IEEE Transactions on Wireless Communications.

[16]  V. Srinivasa Somayazulu,et al.  RAKE performance for a pulse based UWB system in a realistic UWB indoor channel , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[17]  G.B. Giannakis,et al.  Ultra-wideband communications: an idea whose time has come , 2003, 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)..