DDCSK-Walsh Coding: A Reliable Chaotic Modulation-Based Transmission Technique

To overcome the performance loss of noncoherent detectors of differential chaos-shift keying (DCSK), some improved versions of DCSK have been proposed. However, little has been done to improve the multiuser DCSK system based on Walsh codes (WCs), i.e., referred to as DCSK-WC, although it is considered more feasible in practice among the existing multiuser DCSK systems. This brief introduces a novel differentially DCSK (DDCSK) technique into such a multiuser system so as to build the desirable DDCSK-WC, obtaining significant performance gain, as compared with the conventional DCSK-WC, while retaining its hardware complexity unchanged. Moreover, the proposed system can greatly enhance the robustness against intersymbol interference in a wireless multipath fading channel. Therefore, the new system is deemed to provide a good alternative transmission scheme for wireless communication based on chaotic modulation, in such as indoor applications of the transmitted-reference ultrawideband. The theoretical analysis and simulated noise performances of the proposed system demonstrate their high consistence.

[1]  M. P. Kennedy,et al.  Chaotic communications with correlator receivers: theory and performance limits , 2002, Proc. IEEE.

[2]  Lin Wang,et al.  Performance of DCSK Cooperative Communication Systems Over Multipath Fading Channels , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  Timothy J. Wren,et al.  Orthogonal chaotic vector shift keying in digital communications , 2010, IET Commun..

[4]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[5]  C. K. Michael Tse,et al.  Optimum noncoherent FM-DCSK detector: application of chaotic GML decision rule , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).

[6]  Riccardo Rovatti,et al.  Chaos-Based Spreading in DS-UWB Sensor Networks Increases Available Bit Rate , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[7]  Lin Wang,et al.  Performance of an SIMO FM-DCSK Communication System , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  Weikai Xu,et al.  Performance of improved FM-DCSK system based on differential-coding method , 2008, 2008 International Conference on Communications, Circuits and Systems.

[9]  Guanrong Chen,et al.  Promising performance of a frequency-modulated differential chaos shift keying ultra-wideband system under indoor environments , 2010, IET Commun..

[10]  W. M. Tam,et al.  Chaos-based digital communication systems , 2003 .

[11]  G. Kolumban,et al.  Differential chaos shift keying : A robust coding for chaotic communication , 1996 .

[12]  Gábor Kis,et al.  Non-Redundant Error Correction in FM-DCSK Chaotic Communications Systems , 2001 .

[13]  G. Kolumban.  UWB technology: chaotic communications versus noncoherent impulse radio , 2005, Proceedings of the 2005 European Conference on Circuit Theory and Design, 2005..

[14]  Zbigniew Galias,et al.  Quadrature chaos-shift keying: theory and performance analysis , 2001 .

[15]  Shaoyuan Chen,et al.  Data-Aided Timing Synchronization for FM-DCSK UWB Communication Systems , 2010, IEEE Transactions on Industrial Electronics.

[16]  C. K. Michael Tse,et al.  Performance of differential chaos-shift-keying digital communication systems over a multipath fading channel with delay spread , 2004, IEEE Transactions on Circuits and Systems II: Express Briefs.

[17]  Chia-Chin Chong,et al.  UWB Direct Chaotic Communication Technology for Low-Rate WPAN Applications , 2008, IEEE Transactions on Vehicular Technology.

[18]  Michael Peter Kennedy,et al.  Enhanced versions of DCSK and FM-DCSK data transmission systems , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).