The use of coding and diversity combining for mitigating fading effects in a DS/CDMA system

Diaz, P.; Agustí, R.

doi:10.1109/25.661036

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Where $U_{p}^{(i)}$ is the output of RAKE p ( i ) associated with channel p of the i th user. Proceeding as in Reference 27, $\alpha_{p}^{(i)}$ , p = 1,2,…, P are random variables associated with channel p with Chi‐Square distribution as defined in Equation (17). For one out of P selective diversity, the pdf of the switch output variable α ( i ) Since paths are assumed to have identical statistical distribution, therefore Therefore, The probability of error at the initial stage is therefore given by For P = 2 this integration yields, Also, for P = 4 and L = 2, Equation (41) yields, …”

Section: Combining Selection Diversity With Rakementioning

confidence: 99%

Parallel interference cancellation employing RAKE receiver with selection diversity for multiuser asynchronous DS/CDMA detectors in multipath Rayleigh fading channels

Al-Hussaini¹,

Mourad²,

Gohary³

2002

Wireless Communications

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In this paper, we propose and analyse parallel CCI multistage cancellation by combining RAKE and selection diversity. In order to account for channel variations, adaptive implementation of decision thresholds at the RAKE output is suggested. It is shown to provide significant improvement over either hard or soft decision techniques especially in the near-far situation. Investigation of the system robustness to imperfect channel parameter estimation is also presented. The communication channel is modelled as slowly varying Rayleigh fading discrete multipath channel.

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Section: Combining Selection Diversity With Rakementioning

confidence: 99%

Parallel interference cancellation employing RAKE receiver with selection diversity for multiuser asynchronous DS/CDMA detectors in multipath Rayleigh fading channels

Al-Hussaini¹,

Mourad²,

Gohary³

2002

Wireless Communications

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“…For such a channel, diversity techniques and channel coding are attractive. Channel coding has been effectively employed in the mobile communications systems for a long time [3].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive evaluation of chip interleaving effect on turbo‐coded DS‐SS in a Rayleigh fading channel with antenna diversity reception

Garg

Adachi

2005

Wireless Communications

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In this paper, we present a comprehensive performance evaluation of chip interleaving effect on turbo coded direct sequence spread spectrum (DS-SS) system in a frequency non-selective Rayleigh fading channel with antenna diversity reception. At the transmitter, chip interleaver scrambles the SF (spreading factor) chips associated with a data symbol and transforms the transmission channel into a highly time-selective or highly memoryless channel at the chip level. The use of chip interleaving is equivalent to using SF-antenna diversity reception with correlated fading among the branches and with reduced average received signal power per antenna by a factor of SF. We theoretically analyze how chip interleaving alters the received signal statistics. Then, the effect of the various parameters, viz. interleaver size, interleaving depth, information sequence length, spreading factor and the fading maximum Doppler frequency, are also evaluated. It is found that the bit error rate (BER) performance improves with increasing spreading factor and increasing frame length. Chip interleaving is found to be effective in the presence of receive antenna diversity as well.

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“…In this paper, we investigate the performance of combined diversity and convolutional coding strategies. Performance analysis of coded CDMA systems in Rayleigh fading appeared in [14]- [20]. In particular, Diaz and Agusti [14] presented closed form analytical BER expressions achieved in a coherent BPSK DS-CDMA system for any power-delay profile and for either selection combining or MRC in independent Rayleigh fading assuming distinct path SNR.…”

Section: Introductionmentioning

confidence: 99%

Error probability performance for W-CDMA systems with multiple transmit and receive antennas in correlated nakagami fading channels

Luo

Zeidler

Proakis

2002

IEEE Trans. Veh. Technol.

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Abstract-The bit error rate (BER) performance of a two-dimensional (2-D) RAKE receiver, in combination with transmit diversity on the downlink of a wide-band CDMA (W-CDMA) system, is presented. The analyses assume correlated fading between receive antenna array elements, and an arbitrary number of independent but nonidentical resolvable multipaths combined by the RAKE receiver in the general Nakagami-m fading channel framework. The impact of the array configuration (e.g., the number of transmit antennas and receive antennas, the antenna element separation) and the operating environment parameters (such as the fading severity, angular spread and path delay profile) on the overall space-path diversity gain can be directly evaluated. In addition, the exact pairwise error probability of a convolutional coded system is obtained, and the coding gain of a space-path diversity receiver is quantified.Index Terms-Convolutional coding, correlated Nakagami fading, multiple-input-multiple-output (MIMO) systems, pairwise error probability, space-path diversity, two-dimensional (2-D) RAKE receiver.

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The use of coding and diversity combining for mitigating fading effects in a DS/CDMA system

Cited by 11 publications

References 12 publications

Parallel interference cancellation employing RAKE receiver with selection diversity for multiuser asynchronous DS/CDMA detectors in multipath Rayleigh fading channels

Parallel interference cancellation employing RAKE receiver with selection diversity for multiuser asynchronous DS/CDMA detectors in multipath Rayleigh fading channels

Comprehensive evaluation of chip interleaving effect on turbo‐coded DS‐SS in a Rayleigh fading channel with antenna diversity reception

Error probability performance for W-CDMA systems with multiple transmit and receive antennas in correlated nakagami fading channels

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