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Department of Science and Technology Institutionen för teknik och naturvetenskap Linköpings Universitet Linköpings Universitet SE-601 74 Norrköping, Sweden 601 74 Norrköping C-uppsats LITH-ITN-EX--05/001--SE Optimized Power Control for CDMA System using Channel Prediction Tommi Uurtonen 2005-01-07

Transcript of 20430/FULLTEXT01.pdf

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Department of Science and Technology Institutionen för teknik och naturvetenskap Linköpings Universitet Linköpings Universitet SE-601 74 Norrköping, Sweden 601 74 Norrköping

C-uppsatsLITH-ITN-EX--05/001--SE

Optimized Power Control for CDMASystem using Channel Prediction

Tommi Uurtonen

2005-01-07

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LITH-ITN-EX--05/001--SE

Optimized Power Control for CDMASystem using Channel Prediction

Examensarbete utfört i reglerteknikvid Linköpings Tekniska Högskola, Campus

Norrköping

Tommi Uurtonen

Handledare Kjell NordströmExaminator Kjell Nordström

Norrköping 2005-01-07

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RapporttypReport category

Examensarbete B-uppsats C-uppsats D-uppsats

_ ________________

SpråkLanguage

Svenska/Swedish Engelska/English

_ ________________

TitelTitle

FörfattareAuthor

SammanfattningAbstract

ISBN_____________________________________________________ISRN_________________________________________________________________Serietitel och serienummer ISSNTitle of series, numbering ___________________________________

NyckelordKeyword

DatumDate

URL för elektronisk version

Avdelning, InstitutionDivision, Department

Institutionen för teknik och naturvetenskap

Department of Science and Technology

2005-01-07

xx

LITH-ITN-EX--05/001--SE

http://www.ep.liu.se/exjobb/itn/2005/de/001/

Optimized Power Control for CDMA System using Channel Prediction

Tommi Uurtonen

In an optimal power control scheme for a Code Division Multiple Access (CDMA) system all MobileStations (MS's) signals should arrive to the Base Station (BS) at equal power. If not, stronger singalsmay cause too much interference and block out weaker ones. Commonly used power control schemesutilizes the Signal to Interference Ratio (SIR) to design a Power Control Command (PCC) to adjust thetransmit power of the MS. A significant problem within the conventional methods is the slow SIRrecovery due to deep channel fades. Conventional methods base the PCC on the current channel statewhen in fact, the channel state may have significantly changed when transmission occurs. These channelchanges may cause the SIR to drop or rise drastically and lead to uncontrollable Multi AccessInterference (MAI) resulting in power escalation and making the system unstable. In order to overcomepower escalation and improve the recovery from deep fades a novel power control method has beendeveloped. Based on Linear Quadratic Gaussian (LQG) control and Kalman filtering for channelprediction this method designs the PCC based on the coming channel state instead of the current. Thisoptimizes the PCC for the channel state where transmission occurs. Simulations show that this controlscheme outperforms previous methods by making the impacts of the deep fades less severe on the SIRand also improves the overall SIR behaviour.

cdma, power control, prediction

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Copyright

The publishers will keep this document online on the Internet - or its possiblereplacement - for a considerable time from the date of publication barringexceptional circumstances.

The online availability of the document implies a permanent permission foranyone to read, to download, to print out single copies for your own use and touse it unchanged for any non-commercial research and educational purpose.Subsequent transfers of copyright cannot revoke this permission. All other usesof the document are conditional on the consent of the copyright owner. Thepublisher has taken technical and administrative measures to assure authenticity,security and accessibility.

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© Tommi Uurtonen

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(Rayleigh fading)

Generate Noise

Code

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Initiate Novel Approach Parameters

Display relevant graphsfor comparison purposes

Find Control Commandusing Novel Approach

Find Control Commandusing Conventional Method

Transmit

Update Transmission Powerusing Novel Approach

Update Transmission Powerusing Conventional Methods

Create Parameters

Create Message

Set Variables

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Page 36: 20430/FULLTEXT01.pdf

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Page 37: 20430/FULLTEXT01.pdf

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Page 38: 20430/FULLTEXT01.pdf

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Page 41: 20430/FULLTEXT01.pdf

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Page 42: 20430/FULLTEXT01.pdf

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Page 44: 20430/FULLTEXT01.pdf

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Page 46: 20430/FULLTEXT01.pdf

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Page 47: 20430/FULLTEXT01.pdf

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