Open Access
Accurate techniques to evaluate CDMA bit error rates in multipath channels with imperfect power control
Joseph C. Liberti,Theodore S. Rappaport +1 more
- pp 33-37
TLDR
In this paper, a simplified expression for the improved Gaussian approximation (SEIGA) is presented for accurately evaluating Direct Sequence Code Division Multiple Access (DS-CDMA) bit error rates in multipath channels and systems with imperfect power control.Abstract:
In this paper, a Simplified Expression for the Improved Gaussian Approximation (SEIGA) is presented for accurately evaluating Direct Sequence Code Division Multiple Access (DS-CDMA) bit error rates in multipath channels and systems with imperfect power control. Previous techniques for evaluating bit error rate performance of these systems can lead to overly optimistic results under a variety of conditions, particularly when directional or adaptive antennas are used at the base station. In this paper, we demonstrate the accuracy of these new techniques for evaluating bit error rates in both narrowband and wide band multipath channels and illustrate these techniques by providing a system example in which adaptive antennas are applied to CDMA cellular radio systems.read more
Citations
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A novel approach for estimating multi-user interference in impulse radio UWB networks: the pulse collision model
TL;DR: A novel analytical expression for the average BER is provided based on the observation that interference in IR is provoked by collisions occurring between pulses belonging to different transmissions, which shows improved accuracy in estimating BER.
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Analysis of CDMA cellular radio systems employing adaptive antennas in multipath environments
TL;DR: The results indicate that the multipath structure significantly impacts the performance improvements that can be achieved by spatial filters in CDMA cellular radio systems employing adaptive antennas in multipath environments.
Journal ArticleDOI
Fast simulation of DS/CDMA with and without coding in multipath fading channels
TL;DR: In this paper, the error-rate performance of asynchronous direct-sequence CDMA in a wireless radio communications environment that is characterized by Rayleigh multipath fading channels is evaluated using Monte Carlo simulations.
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Effects of multiple-access interference on the noncoherent delay lock loop
J. Caffery,Gordon L. Stuber +1 more
TL;DR: A renewal theory approach is applied along with the more familiar linear theory and results indicate a drastic decrease in performance as the number of users in a system is increased.
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A geometrical-based microcell mobile radio channel model
TL;DR: A geometric multipath propagation model for a microcell mobile environment that provides the statistics for the direction-of-arrival (DOA) of multipath components to test adaptive array algorithms for cellular applications is presented.
References
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Journal ArticleDOI
A simple, accurate method to calculate spread-spectrum multiple-access error probabilities
TL;DR: The author derives an accurate Gaussian approximation which is also computationally very simple, the 'standard approximation', which is not generally accurate enough for direct-sequence spread-spectrum multiple-access systems.
Journal ArticleDOI
Error Probabilities for Binary Direct-Sequence Spread-Spectrum Communications with Random Signature Sequences
TL;DR: An expression for the output of the receiver is obtained for the case of random signature sequences, and the corresponding characteristic function is determined to study the density function of the multiple-access interference and to determine arbitrarily tight upper and lower bounds on the average probability of error.
Journal ArticleDOI
Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication--Part II: Code Sequence Analysis
TL;DR: An analysis of the code sequence parameters that are most important to the communication performance of an asynchronous phase-coded spread-spectrum multiple-access communication system is presented.
Proceedings ArticleDOI
BER estimation of asynchronous DS/CDMA communications systems
TL;DR: Importance sampling is a modified Monte Carlo technique which can significantly reduce the computational cost required to achieve accurate Monte Carlo estimates and its use for the efficient simulation of asynchronous direct-sequence based CDMA systems employing binary phase shift keying modulation along with specific signature sequences for a variety of system parameters.
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