Journal ArticleDOI
Capacity gain of an uplink-synchronous WCDMA system under channelization code constraints
TLDR
The performance of an uplink-synchronous wide-band code-division multiple-access (WCDMA) system is evaluated for radio environments with low temporal dispersion and suggests that the capacity gain of synchronous WCDMA decreases when other capacity-enhancing techniques are deployed.Abstract:
The performance of an uplink-synchronous wide-band code-division multiple-access (WCDMA) system is evaluated for radio environments with low temporal dispersion. The capacity gain of synchronous WCDMA is evaluated theoretically under certain constraints and by means of extensive dynamic system level simulations for more advanced scenarios. The effect of channelization code shortage, the impact of the dispersive radio channel on the orthogonality of received signals, and soft handover are some of the considered effects. The potential capacity gain is found to equal 35.8% in a multicell scenario, conditioned on an infinite number of channelization codes per cell. For a more realistic scenario with channelization code constraints, the capacity gain is reduced to 9.6%. The absolute number of users per cell, relative to the available number of channelization codes within each scrambling code group, is therefore found to be an important metric. This further suggests that the capacity gain of synchronous WCDMA decreases when other capacity-enhancing techniques are deployed, such as uplink antenna diversity, soft handover, voice activity detection, etc. The presented simulation results in the case where soft handover is not considered accurately match the analytical findings.read more
Citations
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Dissertation
Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks
TL;DR: An analytical model is presented for approximating the user distributions in multi-cell third generation wideband code division multiple access (WCDMA) networks using 2-dimensional Gaussian distributions, which allows for the calculation of the inter-cell interference and the reverse-link capacity of the network.
Proceedings ArticleDOI
Capacity allocation in multi-cell umts networks for different spreading factors with perfect and imperfect power control
Robert Akl,Son Nguyen +1 more
TL;DR: An analytical model for calculating capacity in multicell UMTS networks is presented and capacity is maximized for different spreading factors and for perfect and imperfect power control.
Journal ArticleDOI
Uplink capacity improvement through orthogonal code hopping in uplink-synchronized CDMA systems
TL;DR: The proposed orthogonal code hopping multiple access scheme can accommodate more users than the number of available OCs and is compared with conventional schemes including the system using multi-scrambling codes (MSC) which have also been proposed to overcome a code-limited situation.
Journal ArticleDOI
UMTS Capacity and Throughput Maximization for Different Spreading Factors
Robert Akl,Son Nguyen +1 more
TL;DR: An analytical model for calculating capacity in multi-cell UMTS networks is presented and a local call admission control (CAC) algorithm is designed which allows for the simulation of network throughput for different spreading factors and various mobility scenarios.
References
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Book
Multiuser Detection
TL;DR: This self-contained and comprehensive book sets out the basic details of multiuser detection, starting with simple examples and progressing to state-of-the-art applications.
BookDOI
WCDMA for UMTS: Radio Access for Third Generation Mobile Communications
Harri Holma,Antti Toskala +1 more
TL;DR: In this article, the authors provide a complete picture of the Wideband CDMA (Code Division Multiple Access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunications Systems).
Book
WCDMA for UMTS
Harri Holma,Antti Toskala +1 more
TL;DR: In this article, the authors present the key parts of the 3GPP/WCDMA standard and provide guidelines for its efficient use and present network dimensioning and coverage and capacity planning of WCDMA.
Journal ArticleDOI
Multi-user detection for DS-CDMA communications
TL;DR: A number of important multiuser DS-CDMA detectors that have been proposed are described, where information about multiple users is used to improve detection of each individual user.
Journal ArticleDOI
Smart antennas for wireless systems
TL;DR: Standard cellular antennas, smart antennas using fixed beams, and adaptive antennas for base stations, as well as antenna technologies for handsets are described and the potential improvement that these antennas can provide is shown.
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