ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Effects of Array Weight Errors on Parallel Interferene Cancellation Receiver in Uplink Synchronous and Asynchronous DS-CDMA Systems

  • Kim, Yong-Seok (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Hwang, Seung-Hoon (School Electronics and Computer Science, University of Southampton) ;
  • Whang, Keum-Chan (Department of Electrical and Electronic Engineering, Yonsei University)
  • Received : 2003.12.16
  • Published : 2004.10.31
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Abstract

This paper investigates the impacts of array weight errors (AWE) in an antenna array (AA) on a parallel interference cancellation (PIC) receiver in uplink synchronous and asynchronous direct sequence code division multiple access (DS-CDMA) systems. The performance degradation due to an AWE, which is approximated by a Gaussian distributed random variable, is estimated as a function of the variance of the AWE. Theoretical analysis, confirmed by simulation, demonstrates the tradeoffs encountered between system parameters such as the number of antennas and the variance of the AWE in terms of the achievable average bit error rate and the user capacity. Numerical results show that the performance of the PIC with the AA in the DS-CDMA uplink is sensitive to the AWE. However, either a larger number of antennas or uplink synchronous transmissions have the potential of reducing the overall sensitivity, and thus improving its performance.

Keywords

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