Performance degradation due to code tracking errors in spread-spectrum code-division multiple-access systems

  • Authors:

  • B. W. 't Hart;R. D.J. van Nee;R. Prasad

  • Affiliations:

  • Telecommun. & Traffic-Control Syst. Group, Delft Univ. of Technol.;-;-

  • Venue:
  • IEEE Journal on Selected Areas in Communications
  • Year:
  • 2006

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Abstract

The influence of code synchronization errors on the performance of direct-sequence spread-spectrum (DS/SS) communication systems is investigated. Insight is gained in the degradation of some basic performance parameters due to the tracking bias of a noncoherent delay lock loop (DLL). The performance parameters investigated are the bit-error probability, throughput and delay. Numerical results show that for receivers with an early-late spacing of d=1, using a noncoherent DLL, the results of a system performance analysis in a fast fading environment can be much too optimistic if the tracking errors are ignored