Effect of multipath propagation on the forward link of a CDMA cellular system

DaSilva, V.M.; Sousa, E.S.; Jovanovic, Vladan

doi:10.1007/bf01098503

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…We consider a non-ideal system model in which traffic signal orthogonalisation is not preserved [1][2][3][4] and a bank of simple correlation receivers is non-optimal. We assume that the signals are received in the presence of transmitter, receiver and channel nonlinearities, fast time-varying (time selective) multipath fading, shadowing, path loss, Doppler spread, intracell and intercell interference and additive white Gaussian noise (AWGN).…”

Section: Introductionmentioning

confidence: 99%

Simulation study of a successive interference cancellation receiver for signal monitoring on a CDMA downlink

Golanbari

Ford

Ready

2008

Trans Emerging Tel Tech

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SUMMARYA successive interference cancellation (SIC) algorithm is developed for the interception of signals transmitted on a CDMA forward link. The system is modelled after the IS-95 standard but the results are also applicable to other CDMA systems such as the wideband CDMA (W-CDMA) and IS-2000 standards. In realistic systems, the different forward link channels are de-orthogonalised, leading to performance degradation in conventional matched filter (CMF)-type receivers. Simulation results indicate that the proposed SIC receiver ameliorates the detrimental effects of de-orthogonalisation, interference and multipath, exhibiting significant gains in traffic capacity over the capacity of a CMF. The numerical simulations also show that the proposed receiver is relatively insensitive to system imperfections. The techniques developed in this paper can be used for interception, surveillance, reconnaissance or monitoring of CDMA signals; to relax the strict requirements on power control; and to improve the capacity of CDMA systems.

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Section: Introductionmentioning

confidence: 99%

Simulation study of a successive interference cancellation receiver for signal monitoring on a CDMA downlink

Golanbari

Ford

Ready

2008

Trans Emerging Tel Tech

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“…These SNR expressions include the effect of self-interference, same-cell, other-cell, adjacentchannel interference, and noise, and can be used for systemlevel simulations. The expressions also get rid of certain simplifying assumptions commonly made such as rectangle pulse shaping [7], [8], sinc function [9], [10], or a time-limited pulse at the transmitter and receiver [11]. Considering RRC pulse shaping, customarily used in communication systems, greatly increases the complexity of the analysis to the point of making it difficult to obtain simple analytic expressions as in the rectangular case.…”

Section: Introductionmentioning

confidence: 99%

“…Other assumptions usually made are a chip-spaced multipath channel model [7], [8], [11], Binary Phase Shift Keying (BPSK) modulation [7]- [9], [11]- [13] instead of Quadrature Phase Shift Keying (QPSK) and delay spread considerably smaller than the bit period [9].…”

Section: Introductionmentioning

confidence: 99%

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Computationally-Efficient SNR Estimation for Bandlimited Wideband CDMA Systems

Jatunov

Madisetti

2006

IEEE Trans. Wireless Commun.

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We present closed-form analytic expressions for the Signal-To-Noise Ratio (SNR) of the downlink of 3G CDMA systems using Root Raised Cosine (RRC) chip pulse shaping with arbitrary roll-off factors, Quadrature Phase Shift Keying (QPSK) modulation, and Maximum Ratio Combining (MRC) RAKE Receiver. The expressions obtained are also applicable to variable processing gain, chip rate, and data rate for orthogonal codes, random codes, and include adjacent channel interference, outof-cell interference, and Gaussian noise. Moreover, the analysis applies to channel models with arbitrary path separation and delay spread and takes into account the self-interference. The mathematical derivation utilized is both insightful and straightforward.The theoretical expressions produce results at a speed several orders of magnitude faster than Monte-Carlo simulations while closely matching them.Additionally, the so-called orthogonality factor, used for system-level simulations, is also derived in this work.

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“…We focus our study on a dual-branch MMSEC-RAKE receiver with RR in a typical indoor office channel. Similar to the work of DaSilva et al [11], we take into account the chip pulse shape used in practical implementations. This is important because in an interference dominated system, the pulse shape determines not only the correlation of the signal, but also the correlation of the noise.…”

Section: Introductionmentioning

confidence: 99%

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

Hueda

Corral-Briones

Rodriguez

2001

IEEE Trans. Commun.

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In channels where the delay spread is smaller than the chip interval (e.g., an IS-95 system operating in indoor environments), spread-spectrum signals do not give rise to path diversity. In this situation, maximal-ratio combiner (MRC) RAKE receivers with resolution reduction (RR) of the diversity receiver branches may be used by the mobile stations to provide diversity gain, significantly improving system performance. A new resolution reduction technique based on the use of a minimum mean-square-error diversity combiner (MMSEC) is proposed in this work. We show that, under very general assumptions, this new method of RR is optimal. A detailed study of the performance of a dual-branch MMSEC-RAKE receiver with RR in a typical indoor office environment is presented. In order to allow a simple practical implementation, a suboptimal structure of the MMSEC is also proposed. Numerical results show that this new receiver scheme provides a 1.2-dB improvement over the previously proposed RR technique based on MRC, and a 4.9-dB improvement over conventional MRC-RAKE receiver without RR, at a frame-error rate of 0.01 for the downlink of the IS-95 system in a typical indoor office environment.

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Effect of multipath propagation on the forward link of a CDMA cellular system

Cited by 14 publications

References 7 publications

Simulation study of a successive interference cancellation receiver for signal monitoring on a CDMA downlink

Simulation study of a successive interference cancellation receiver for signal monitoring on a CDMA downlink

Computationally-Efficient SNR Estimation for Bandlimited Wideband CDMA Systems

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

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