Power Control in
            <scp>CDMA</scp>
            Cellular Communication Systems

Rintamaki, M.

doi:10.1002/0471219282.eot310

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…In 1948, mathematical basics for the transmission of information were recognized by Shannon. In the situation of an Additive White Gaussian Noise (AWGN) channel, derive most known form of capacity of the channel, which specified by [16]- [18]:…”

Section: Channel Capacity For Multi-antenna Systemsmentioning

confidence: 99%

Capacity Enhancement for the Vehicular Network using Spatial Multiplexing

Saleh¹,

Hasoon²

2018

IJET

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Vehicular Ad hoc Network (VANET) is an advanced system and subcategory of a Mobile Ad hoc Network (MANET), it has as the potential to significantly impact road safety and improve traffic by providing critical information to drivers on critical routes. The system can inform the driver of a local anomaly, which is a very short distance from the sensors. Data from this sensors can be passing between vehicles so as to increase awareness of this environment. Intelligent Transport System (ITS) applications will include traffic efficiency, comfort of driving and road safety. The transaction of warning messages exploits a limited capacity because these application s generate little separate messages. Estimating the capacity of the VANET is therefore essential, as it may limit the deployment or usefulness of these applications. Therefore, an estimate must be made in advance for application design with capacity limitations in mind. VANET capacity is limited mainly through spatial reuse. Multiple-Input Multiple-Output (MIMO) structures have been suggested to replace the conventional systems. In MIMO systems, a much higher data rate can be achieved than in a VANET environment. The objectives of the paper to study the capacity of the VANET network associated with new promising MIMO technology. Spatial multiplexing (SM),utilizes the spatial dimension to maximizethe capacity of a link without expanding a bandwidth. The SM gain is achieved throughtransmitting signals concurrently on parallel channels spatially with the same frequency. Capacity calculated over VANETs environments with MIMO/SM techniques, using Rayleigh Fading Channel with BPSK modulation. The results of MATLAB simulation package 2017a, indicate the enhancement in the unit of bit per second per Hertz (b/s/Hz). A maximum capacity improvement for MIMO system over Single Input Single Output (SISO) was achieved by using (4 x 4) system, it is about 16.14 b/s/Hz.

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Section: Channel Capacity For Multi-antenna Systemsmentioning

confidence: 99%

Capacity Enhancement for the Vehicular Network using Spatial Multiplexing

Saleh¹,

Hasoon²

2018

IJET

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“…Therefore, approximately 10% of the power control command are received erroneous [26]. Let p error be the probability of existence of error in the received power control command.…”

Section: Random-modified-amtpamentioning

confidence: 99%

Interference Management in Underlay Spectrum Sharing Using Indirect Power Control Signalling

Khoshkholgh

Navaie

Yanıkömeroğlu

2013

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we propose an interference management method for underlay spectrum sharing and evaluate its performance. In this method the secondary service has been facilitated by granting passive access to the power control signalling transmitted by the primary network base station. To exploit both slow shadowing and fast fading, the proposed method performs secondary service power management in two phases, each in different time-scales: rate optimal power allocation phase and interference reduction power adjustment phase. In the longer time-scale, rate optimal power allocation phase adaptively allocates the secondary transmit power exploiting the medium-scale channel variations (shadowing effect) of the secondary channel to maximize its capacity. In the shorter timescale, interference reduction power adjustment phase exploits the power control commands transmitted in the primary network to adaptively adjust secondary service transmission power for reducing the effects of the secondary service transmission on the Quality-of-Service (QoS) of the primary service network. The main advantage of this method which is referred to as Adaptive Multiple Time-Scale Power Allocation (AMTPA) is that it does not require direct signaling between the two systems. We further present AMTPA analytical performance evaluation results. Practical considerations are also presented regarding the primary network requirements and its power control feasibility after adopting AMTPA in the secondary network. Extensive simulation results indicate significant improvement in the system performance by using AMTPA. Using simulations we also show how one can set AMTPA parameters so that a certain level of QoS in the primary network is satisfied.Index Terms-Collision probability, DS-CDMA, interference management, underlay spectrum access, spectrum sharing.

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“…The successful operation of these systems depends on some form of power control to maintain the signal-to-interference ratio (SIR) for each user approximately constant. Distributed power control algorithms for CDMA cellular systems have been reviewed in [3] and [4]. A comprehensive overview of limitations of power control in WCDMA (wideband CDMA) is given in [5].…”

Section: Introductionmentioning

confidence: 99%

Three-Degree of Freedom Adaptive Power Control for CDMA Cellular Systems

Agüero

Goodwin

Lau

et al. 2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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The successful operation of CDMA systems depend on the use of power control. This is needed to address the "near far" effect and to mitigate the effects of fading. Other factors also impact on the achievable performance of the power control loop including the fact that only the sign of the power increments are transmitted. The paper presents new methods and results to improve control with respect to the latter strongly non-linear effect. An adaptive control architecture, having three degrees of freedom, is therefore proposed for inner loop power control. The three degrees of freedom are used to address errors resulting from (i) channel and interference variations, (ii) quantization of the power increments and (iii) saturation of the power increments.Simulations show that the proposed controller outperforms other related schemes. A major reason for this is the ability of the three degree of freedom controller to reduce the variation of the control signal to be quantized.

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Power Control in CDMA Cellular Communication Systems

Cited by 9 publications

References 15 publications

Capacity Enhancement for the Vehicular Network using Spatial Multiplexing

Capacity Enhancement for the Vehicular Network using Spatial Multiplexing

Interference Management in Underlay Spectrum Sharing Using Indirect Power Control Signalling

Three-Degree of Freedom Adaptive Power Control for CDMA Cellular Systems

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