Abidi_SDR

Abidi_SDR - Evolution of the Software-Dened Radio (SDR)...

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Evolution of the Software-Defi ned Radio (SDR) Receiver Asad A. Abidi Electrical Engineering Department University of California, Los Angeles
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The Need Quad-band GSM GPRS Wideband CDMA EDGE GPS Bluetooth 802.11b . .. Cram down the funnel of functions Large number of independently developed radio boards, all squeezed into a small mobile device . .. You see one antenna, there are actually 3 or 4 . .. Next month there will be a new wireless application Where will this end??
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The Software Defi ned Radio Pure Digital Radio ADC DAC [J. Mitolla 1995] Mitola 1995 0.8GHz 2GHz 2.5GHz 5GHz f 2G/3G Cellular WLAN/WPAN/Cordless 4G/WMAN 1e5 Sample/S 4 8 12 16 20 Bits 1e7 1e9 1e11 16W 256W * P~500W [Walden, State of the art IEEE JSAC 99] Needs 12b, 10 GS/s A/D Converter (ADC) • Ultimate in f exibility! Low power solution not in sight, Moore’s law doesn’t help
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Abidi, ISSCC Girafe 2006, Page 1 Table 1: RX frequency bands Center Frequency Band [MHz] Standard 460.4-467.6 2G,3G 488.8-496 869-894 2G-3G 925-960 2G-3G 1805-1880 2G-3G 1881-1897 2G-3G 1900-1920 3G 1930-1990 2G-3G 2010-2025 3G 2110-2170 3G 2170-2200 3G 2400-2484 ISM (11g/b, . .) 5150-5350 UNII (11a,cordless) 5725-5825 UNII (11a,cordless) Table 1: TX frequency bands Center Frequency Band [MHz] Standard 450.4-457.6 478.8-486 824-849 2G-3G 894.1-915 2G-3G 1710-1785 2G-3G 1881-1897 2G-3G 1900-1920 3G 1850-1910 2G-3G 1920-1980 3G 1980-2010 3G 2010-2025 3G 2400-2484 ISM (11g/b, . .) 5150-5350 UNII (11a,cordless) 5725-5825 UNII (11a,cordless) Goals for today’s SDR Transceiver
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Abidi, ISSCC Girafe 2006, Page 2 What does the spectrum look like actually? Strong signals in only a few bands, and near base stations Worst-case blocker pro f les are pessimistic Watkins, Bristol U., 2001
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What’s wrong with this concept? Mitola’s SDR can receive every band and channel concurrently! May be important for military, not necessary for civilian uses Standard Modulation Scheme Channel BW (MHz) GSM GMSK 0.200 EDGE 8PSK 0.200 Bluetooth GFSK 1 CDMA IS95 QPSK CDMA 1.25 WCDMA/ CDMA2000 QPSK/16QAM CDMA 1.25-5 802.11a/g OFDM 20 802.11n OFDM 10-20-40 1 Good enough to receive one channel at a time, but from any band , with any channel bandwidth , and any modulation 2 Tunes channel of interest to zero IF 3 Wideband receiver (no RF preselect) MHz Digital RX Modifi ed SDR
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What’s inside the Digital Receiver? fs/2 -fs/2 fs/2M -fs/2M Transfer Function Frequency 0 0 1 () T out in vv t d T = ³ 1/T 2/T Ideal anti-alias ¿ lter Sample rate conversion causes aliasing . .. Everything is software controlled - clock rate, no. of taps Davies, 2000
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How to make the RF/analog fl exible? Push as much to digital as possible - With ADCs that dissipate milliwatts!
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Abidi_SDR - Evolution of the Software-Dened Radio (SDR)...

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