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CDMA450 1xEVDO Performance in Long-Distance Backhauls

CDMA450 1xEVDO Performance in Long-Distance Backhauls. Sergiu Nedevschi, Sonesh Surana U.C. Berkeley. CDMA 450. CDMA2000 standard operating at 450MHz Advantages of 450MHz Better propagation, smaller loss Larger coverage per basestation, fewer basestations

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CDMA450 1xEVDO Performance in Long-Distance Backhauls

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  1. CDMA450 1xEVDO Performance in Long-Distance Backhauls Sergiu Nedevschi, Sonesh Surana U.C. Berkeley

  2. CDMA 450 • CDMA2000 standard operating at 450MHz • Advantages of 450MHz • Better propagation, smaller loss • Larger coverage per basestation, fewer basestations • Universal coverage at reduced initial cost

  3. CDMA 1xEV-DO • EVolution Data Only • Another channel dedicated to data transfer • Leverages same RF characteristics as CDMA1xRTT • Small incremental effort for upgrading to EV-D0 • Characteristics: • Download BW – 2.4Mbps max, 100-200kbps typical • Upload BW – 155Kbps

  4. CDMA450 1x EV-DO is Promising Cell radius: Population per cell: Solution: increase range even further !

  5. Enhancing Performance at Cell Edge:Fixed vs. Mobile • High-gain directional antennas • 9-12 db Yagi antennas • Enhanced transmit power device • Problem with mobile devices: reverse link bottleneck • Fixed local-loop phones: up to 2W (vs. 200mW mobile) • Receive diversity • Problem with mobile handsets: difficult to have small factor with 450MHz antennas for receive diversity • Fixed phones: form factor non-important

  6. ZAPP Network ROMANIA

  7. Signal Quality

  8. Signal Quality

  9. Signal Quality

  10. Upload Throughput

  11. Download Throughput

  12. Conclusions • In fixed settings, 1xEVDO in 450MHz band can be used for backhauls over 50Kms long • Sites at 50Km getting 1.9Mbps (very close to maximum) • Maximum distance limited by software • Current limitations related to link asymmetry • Addressed in 1xEV-DO rev. A • Higher TX power for terminals required • Both directive antennas and dual receive are essential in long-range performance • Economically feasible?

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