SDR for mobile communication

1. SDR for mobile communication M . R . Azimi Course seminar for SDR Instructor : Dr Omidi

2. Modern communication : wireless voice service • Leading edge of this revolution : GSM • Simultaneous phenomenon : Internet • Leading edge of this phenomenon : www ,web browser, TCP/IP • New idea : integrate both of them third generation

3. Common methods for providing BWM • HSCSD : 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

4. UMTS • All mentioned methods using circuit switching: - inefficient for bursty traffic - scheduler at RNC , slow resource allocation -slow update for SHO during cell selection.

5. 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

6. RF system design • Noise and channel capacity : • Free space loss : • Loss in non L.O.S : • Outdoor to indoor and pedestrian model :

7. RF system design • Receiving power in two models: - left figure : -right figure: for point B: for point D:

8. A/D , D/A • First nyquist rule , BP sampling , over sampling • Anti aliasing filter : SAW filter • successive approximation, multipass architecture ,dithering • clock jitter and aperture uncertainty - ADC with an rms sample clock timing jitter of

9. ADC noise budget : • DAC noise budget:

10. DUCs , DDCs • DDC’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.

11. 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

13. CDMA fundamentals • Spreading • Multiple access • soft handoff • power control • RAKE receiver

14. Macro cell specifications • Macro cells : high reliability and providing fall-back capacity

15. Micro cell specifications • High user density , lower power RF power amplifier

16. 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