Multi-code ultra-wideband signaling using chirp waveforms

We propose an ultra-wideband (UWB) scheme that employs chirp waveforms. Signals satisfying the FCC requirements for UWB applications are formed by using multiple linear frequency-modulated (chirped) waveforms. This scheme has the merits of both the multi-band orthogonal frequency division multiplexing (OFDM) UWB scheme such as continuous-wave transmission, and the pulsed UWB scheme such as accurate timing for position location and rich resolvable multipath components. Another advantage unique to the proposed scheme is that passive, low-cost implementation of matched filters/correlators using surface acoustic wave devices is possible, whereas OFDM-UWB must rely on high-speed sampling combined with powerful digital signal processing. We present the details of chirp waveforms for UWB signaling, explore the correlation properties of the multi-codes, study the receiver structures, and simulate the error performance of the proposed scheme in indoor multipath fading environments

[1]  A. H. Tewfik,et al.  Pulsed and non-pulsed OFDM ultra wideband wireless personal area networks , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[2]  Li Zhao,et al.  Performance of ultra-wideband communications in the presence of interference , 2001, ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240).

[3]  Huaping Liu,et al.  Ultra-wideband for multiple access communications , 2005, IEEE Communications Magazine.

[4]  Ryuji Kohno,et al.  Ultra wideband ranging system using improved chirp waveform , 2003, Radio and Wireless Conference, 2003. RAWCON '03. Proceedings.

[5]  Robert Weigel,et al.  A wireless spread-spectrum communication system using SAW chirped delay lines , 2001 .

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

[7]  Moe Z. Win,et al.  On the robustness of ultra-wide bandwidth signals in dense multipath environments , 1998, IEEE Communications Letters.

[8]  Anuj Batra,et al.  A multi-band OFDM system for UWB communication , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[9]  E. Heller,et al.  UWB communication using SAW correlators , 2004, Proceedings. 2004 IEEE Radio and Wireless Conference (IEEE Cat. No.04TH8746).

[10]  I. Guvenc,et al.  Performance evaluation of UWB systems in the presence of timing jitter , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[11]  Huaping Liu,et al.  On the optimum linear receiver for impulse radio systems in the presence of pulse overlapping , 2005, IEEE Communications Letters.

[12]  Wayne E. Stark,et al.  Performance of ultra-wideband communications with suboptimal receivers in multipath channels , 2002, IEEE J. Sel. Areas Commun..

[13]  S.E. Carter,et al.  SAW device implementation of a weighted stepped chirp code signal for direct sequence spread spectrum communications systems , 2000, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[14]  T. Matsumura,et al.  Frequency hopping ultra wideband inter-vehicle radar system using chirp waveforms , 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).

[15]  Liuqing Yang,et al.  Symbol timing estimation in ultra wideband communications , 2002, Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002..