Optimized Power Control for CDMA System using Channel Prediction

C-uppsats LITH-ITN-EX--/1--SE Optimized Power Control for CDMA System using Channel Prediction Tommi Uurtonen 2-1-7 Department of Science and Technology Linköpings Universitet SE-61 74 Norrköping, Sweden Institutionen för teknik och naturvetenskap Linköpings Universitet 61 74 Norrköping

LITH-ITN-EX--/1--SE Optimized Power Control for CDMA System using Channel Prediction Examensarbete utfört i reglerteknik vid Linköpings Tekniska Högskola, Campus Norrköping Tommi Uurtonen Handledare Kjell Nordström Examinator Kjell Nordström Norrköping 2-1-7

Avdelning, Institution Division, Department Institutionen för teknik och naturvetenskap Datum Date 2-1-7 Department of Science and Technology Språk Language x Svenska/Swedish Engelska/English Rapporttyp Report category Examensarbete B-uppsats x C-uppsats D-uppsats ISBN ISRN LITH-ITN-EX--/1--SE Serietitel och serienummer ISSN Title of series, numbering URL för elektronisk version http://www.ep.liu.se/exjobb/itn/2/de/1/ Titel Title Optimized Power Control for CDMA System using Channel Prediction Författare Author Tommi Uurtonen Sammanfattning Abstract In an optimal power control scheme for a Code Division Multiple Access (CDMA) system all Mobile Stations (MS's) signals should arrive to the Base Station (BS) at equal power. If not, stronger singals may cause too much interference and block out weaker ones. Commonly used power control schemes utilizes the Signal to Interference Ratio (SIR) to design a Power Control Command (PCC) to adjust the transmit power of the MS. A significant problem within the conventional methods is the slow SIR recovery due to deep channel fades. Conventional methods base the PCC on the current channel state when in fact, the channel state may have significantly changed when transmission occurs. These channel changes may cause the SIR to drop or rise drastically and lead to uncontrollable Multi Access Interference (MAI) resulting in power escalation and making the system unstable. In order to overcome power escalation and improve the recovery from deep fades a novel power control method has been developed. Based on Linear Quadratic Gaussian (LQG) control and Kalman filtering for channel prediction this method designs the PCC based on the coming channel state instead of the current. This optimizes the PCC for the channel state where transmission occurs. Simulations show that this control scheme outperforms previous methods by making the impacts of the deep fades less severe on the SIR and also improves the overall SIR behaviour. Nyckelord Keyword cdma, power control, prediction

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