BER sensitivity to mistiming in ultra-wideband impulse radios - Part II: Fading channels

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We investigate timing tolerances of ultra-wideband (UWB) impulse radios. We quantify the bit-error rate (BER) sensitivity to epoch timing offset under different operating conditions, including frequency-flat fading channels, dense multipath fading channels, multiple access with time hopping, and various receiver types including sliding correlators and RAKE combiners. For a general correlation-based detector, we derived in Part I unifying expressions for the decision statistics as well as BER formulas under mistiming, given fixed channel realizations. In Part II, we provide a systematic approach to BER analysis under mistiming for fading channels. The BER is expressed in terms of the receiver's energy capture capability, which we quantify under various radio operating conditions. We also develop the optimal demodulator in the presence of timing offset and show a proper design of the correlation-template that is robust to mistiming. Through analyses and simulations, we illustrate that the reception quality of a UWB impulse radio is highly sensitive to both timing acquisition and tracking errors.

Original languageEnglish (US)
Pages (from-to)1897-1907
Number of pages11
JournalIEEE Transactions on Signal Processing
Issue number5
StatePublished - May 2005

Bibliographical note

Funding Information:
Manuscript received April 23, 2003; revised February 27, 2004. Z. Tian was supported by the National Science Foundation under Grant CCR-0238174. G.B. Ginnakis was supported by ARL/CTA under Grant DAAD19-01-2-011 and the National Science Foundation under Grant EIA-0324804. Parts of the work in this paper were presented at the IEEE SPAWC Conference, Rome, Italy, June 2003, and the IEEE GLOBECOM Conference, San Franscisco, CA, December 2003. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Martin Haardt.


  • Mistiming
  • Optimal correlator
  • Performance analysis
  • RAKE receiver
  • Synchronization
  • Ultra-wideband radio


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