Performance of parallel interference cancellation for CDMA in estimated fading channels with delay mismatch

Juntti, Markku; Kansanen, Kimmo; Kaurahalme, O.-P.

doi:10.1109/isssta.1998.722516

Cited by 3 publications

(1 citation statement)

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“…This assumption seems reasonable for any terrestrial CDMA communication system, when the path delays are slowly changing in time [9,13,14]. The delay estimation errors are also assumed constant (the extension to random delay errors is given in Section 5).…”

Section: Semi-analytical Approach For Ber Computation For Constant Dementioning

confidence: 99%

Performance analysis of the RAKE receiver in the presence of multipath delay estimation errors and Rician fading channels

Lohan¹,

Renfors²

2003

Eur. Trans. Telecomm.

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SUMMARYWe derive here a novel unified framework for computing the average bit-error-ratio (BER) of a directsequence spread spectrum receiver using maximum ratio combiner (MRC), in the presence of code synchronization errors and multipath Rayleigh or Rician fading channels. Traditionally, for single-user systems, the signal-to-noise ratio at the output of MRC is modeled as a quadratic form in complex Gaussian variables. We show that this model does not hold when delay errors are present and we propose an improved generic model incorporating the multipath delay estimation errors. We also discuss the case when the RAKE receiver is employed in the presence of multiple users. Based on our theoretical model, BER can be easily derived in a semi-analytical fashion, for any type of pulse shaping and any spacing between multipaths. Very fast results can be obtained for high spreading factors, when inter-chip (ICI) and intersymbol interference (ISI) may be neglected. These results also give the lower bounds on BER for low spreading factors. Theoretical BER curves with QPSK modulation are validated by link level simulations for different downlink Rayleigh and Rician fading channels. Moreover, we discuss the impact of the delay error distribution on BER and we emphasize some practical applications of our generic technique.

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Section: Semi-analytical Approach For Ber Computation For Constant Dementioning

confidence: 99%