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Sökning: WFRF:(Hagerman Bo)

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  • Gunnarsson, Fredrik, et al. (författare)
  • System Aspects of WCDMA Uplink Parallel Interference Cancellation
  • 2005
  • Ingår i: Proceedings of the 61st IEEE Vehicular Technology Conference. - 0780388879 ; , s. 1935-1939
  • Konferensbidrag (refereegranskat)abstract
    • Interference cancellation (IC) has the potential to significantly improve the system capacity of CDMA systems using conventional RAKE receivers. The main objective in this paper is to quantify the potential improvements of parallel interference cancellation (PIC) in terms of system aspects such as capacity gain, coverage gain, relation to power control etc. This is conducted through approximate estimates, system simulations with realistic receiver prototype models, and single-cell field trials with a limited-complexity PIC prototype. It is concluded that the approximate expressions estimate capacity and coverage gains with acceptable accuracy. Moreover, the WCDMA uplink is configured with a fixed power offset between dedicated physical control and data channels. PIC fits well into the system architecture and power control design, which put limitations on other IC structures, such as successive IC (SIC).
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  • Hagerman, Bo (författare)
  • Downlink Relative Co-Channel Interference Powers in Cellular Radio Systems
  • 1995
  • Ingår i: Proceedings of the 1995 IEEE 45th Vehicular Technology Conference. - : IEEE. - 078032742X ; , s. 366-370
  • Konferensbidrag (refereegranskat)abstract
    • One method to achieve high capacity in cellular radio systems involves interference cancellation techniques at the receivers. To design and evaluate the performance of such interference cancellation receivers, it is essential to use realistic models of the co-channel interference. In the paper we study the ordered statistic of the relative co-channel interference, i.e. the ratio between the power level of i:th strongest interferer and the total co-channel interference power. Results from Monte-Carlo simulations show that for base stations on a symmetric grid, hexagonal cells or half-square Manhattan like street cells, the probability density functions (pdf) of the interference ratios are almost independent of the cluster size and of the base station activities. The results demonstrate the dominance of the strongest interference and show that this dominance is even more pronounced in those situations when the signal to interference ratio is low. The presented results provide a base for more realistic models for performance evaluation in cellular systems than the commonly used Gaussian interference model.
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