SDR for mobile communication
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Transcript of SDR for mobile communication
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M . R . AzimiCourse seminar for SDR
Instructor : Dr Omidi
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Modern communication : wireless voice serviceLeading edge of this revolution : GSM
Simultaneous phenomenon : InternetLeading edge of this phenomenon : www ,web browser,
TCP/IP
New idea : integrate both of themthird generation
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Common methods for providing BWMHSCSD : symmetric or asymmetric aggregates circuit
channels
GPRS: sharing time slots between different users and enabling Internet access
EDGE modifies the radio link modulation from GMSK to 8QPSK
UMTS utilizes a wide band CDMA or TD/CDMA transceiver
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UMTSAll mentioned methods using circuit switching: - inefficient for bursty traffic - scheduler at RNC , slow resource allocation -slow update for SHO during cell selection.
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UMTS New approach : using packet switching , adding all IP
features , HSDPA, intelligent or adaptive antenna - a spectrum efficient packet-by-packet fast scheduling- Fast Resource Allocation with the scheduler at the BTS- FCS due to the optimization for packet data delivery, capacity
coverage and high data rate at the cell edge
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RF system design Noise and channel capacity :
Free space loss :
Loss in non L.O.S :
Outdoor to indoor and pedestrian model :
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RF system designReceiving power in two models: - left figure : -right figure: for point B: for point D:
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A/D , D/AFirst nyquist rule , BP sampling , over samplingAnti aliasing filter : SAW filtersuccessive approximation, multipass architecture ,ditheringclock jitter and aperture uncertainty - ADC with an rms sample clock timing jitter of
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ADC noise budget :
DAC noise budget:
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DUCs , DDCsDDC’s requirements in 2G and 3G:-Filter or isolate a narrow band of frequencies from the
wideband source and reject the reminder of the band.-Translate that isolated carrier down in frequency ,usually from
an IF to baseband.-Reduce the data rate to some integer multiple of information
rate.DUC’s requirements in 2G and 3G:-translate one or more narrowband signal sources up in
frequency, usually from baseband to an IF.-Combine the baseband sources to create one wideband result.-Increase the data rate to a digital IF rate.
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ISL5217(DUC)Data input routing Data modulation Sample rate NCO Shaping filters Halfband filter Complex mixer and carrier NCO Gain control Output routing, summing and control
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CDMA fundamentals Spreading
Multiple access
soft handoff
power control
RAKE receiver
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Macro cell specificationsMacro cells : high reliability and providing fall-back
capacity
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Micro cell specificationsHigh user density , lower power RF power amplifier
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References:software defined radio for 3G “ Paul burns “The UMTS Network and Radio Access Technology “Dr.
Jonathan P. Castro “Orange Communications SA/AG, Switzerland
“Communication Profiles for SDR Equipment” by Eiman Mohyeldin, Markus Dillinger, and J. Luo, Peter Dornbusch, Michael Fahrmair, Chris Salzmann, Siemens AG, Munich University of Technology
Software radio evolution and its application to aeronautical mobile communications by ”Minh Nguyan”
Software Defined Radio Forum General Meeting by Nalini Uhrig , Bryan Tropper, Nancy Pearson, Michael Agha