Reverse Channel Performance Improvements in CDMA Cellular Communication Systems Employing Adaptive Antennas

Liberti, J.C.; Rappaport, Theodore S.

doi:10.1007/978-1-4615-2758-9_3

Cited by 31 publications

(49 citation statements)

References 5 publications

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“…The channel model used in this work was the Geometrical Based Single Bounce Elliptical Model (GBSBEM) proposed by Liberti [4]. This model was developed for microcell and picocell environments.…”

Section: B Channel Modelmentioning

confidence: 99%

“…Each tap (from each user and each burst) is characterized by a complex amplitude and a delay. The delay of each tap including the LOS tap is a random variable characterized by a probability density function whose expression can be found in [4]. After evaluating the delays of the taps, all LOS taps delays of all users are synchronized and the others shifted in according.…”

Section: B Channel Modelmentioning

confidence: 99%

“…In this model the angle of arrival (AOA) of the LOS tap of each user is fixed for one simulation and the angles of others taps are random variables with mean equal to AOA of LOS tap and a distribution given [4]. The channel parameters are assumed to be constant within each burst.…”

Section: B Channel Modelmentioning

confidence: 99%

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Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Gonçalves

Gameiro

2007

Trans Emerging Tel Tech

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Abstract-Direct Sequence Code Division Multiple Access (DS-CDMA) signals exhibit cyclostationary properties which imply a redundancy between frequency components separated by multiples of the symbol rate. In this paper a Multiple Access Interference Canceller (Frequency Shift Canceller) that explores this property is presented. This linear frequency domain canceller operates on the spreaded signal in such way that the interference and noise at its output is minimized (Minimum Mean Squared Error Criterium). The Frequency Shift Canceller (FSC) performance was evaluated for a UMTS-TDD scenario and multisensor configurations, where the cases of diversity and beamforming were considered. All these configurations are evaluated concatenated with a parallel interference canceller (PIC-2D). The results are benchmarked against the performance of the conventional RAKE-2D detector, the conventional PIC-2D detector and single user scenario, and we observe considerable performance gains with the FSC specially for the diversity case and a performance close to the single user case when it was evaluated jointly with PIC-2D.

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Section: B Channel Modelmentioning

confidence: 99%

Section: B Channel Modelmentioning

confidence: 99%

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Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Gonçalves

Gameiro

2007

Trans Emerging Tel Tech

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“…The most popular uses subspace-based techniques to exploit the eigen structure of the input covariance matrix, for example MUSIC and ESPRIT. The most significant drawbacks of the subspace-based techniques are [3] [9]:…”

Section: A Subspace-based Techniquesmentioning

confidence: 99%

“…Subspace based methods are high-resolution sub-optimal techniques which exploit the eigen structure of the input data matrix, e.g. MUSIC (Multiple Signal Classification) and ESPRIT (Estimation of Signal Parameters via Rotational Invariance Technique), but it degrades severely in a multipath propagation environment [3]. Maximum likelihood @E) techniques are optimal and which perform well even under low signal-to-noise ratio conditions, typical of WCDMA systems, but are computationally very demanding.…”

Section: Introductionmentioning

confidence: 99%

High resolution DOA estimation technique for uplink TDD mode

Marques

Gameiro

Femandes

2002

Third International Conference on 3G Mobile Communication Technologies

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-This paper investigates a maximum likelihood (ML) approach for direction of amval (DOA) estimation based on the algorithm suggested by the 3GPP for scalar channels in UTRA-TDD mode. The performance of the algorithm is assessed by resorting to simulations in typical UMTS scenarios. The results indicate that the proposed scheme overcomes the limitation of the angular resolution inherent to classical techniques like subspace or beam-forming methods. In particular, it is shown that waves exhibiting an arbitrarily small difference in azimuth and temporal spacing higher than one chip time interval can be easily separated. A threshold operation is included to select only the most significant paths, in terms of energy, of the estimated channel. The results show that a good performance can be achieved from low to high values of EdNp

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A four‐port 12‐beam phased array antenna system

Chang

Yen

Datta

et al. 2014

Micro & Optical Tech Letters

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In this work, we propose a novel solution for a switched beamformer called the adjustable phased array system (APAS). By programming electronic switches, the implemented four‐antenna APAS circuit generates 12 phase‐shift angles that are multiples of ±π/8. Compared to the legacy N×N Butler matrix, the proposed APAS only needs one input port and four output ports and can provide more beam patterns with lower cost. Therefore, the APAS structure is a practical solution to satisfy the modern multiuser MIMO applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1375–1378, 2014

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Reverse Channel Performance Improvements in CDMA Cellular Communication Systems Employing Adaptive Antennas

Cited by 31 publications

References 5 publications

Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

High resolution DOA estimation technique for uplink TDD mode

A four‐port 12‐beam phased array antenna system

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