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Suggested Approach for 22 Mbps 802.11b Implementation

This technical summary recommends an approach using QPSK at 11 Msps for the implementation of 22 Mbps 802.11b. It discusses the benefits, issues, and provides a summary of the approach.

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Suggested Approach for 22 Mbps 802.11b Implementation

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  1. Suggested Approach for 22 Mbps 802.11b Implementation Niels Van Erven 3Com Corporation November 2000 Niels Van Erven , 3Com

  2. Overview • Recommends an approach to 802.11b using • QPSK @ 11Msps • Technical Summary • Benefits • Issues • Summary Niels Van Erven , 3Com

  3. Technical Summary • QPSK • No special coding • 11 Msps (22 Mbps theoretical) • Backward-compatibility with existing 802.11b • Interoperable with 802.11b • Use common preambles • Logical extension to the current market Niels Van Erven , 3Com

  4. Technical Summary (2) • Minimal MAC changes • Minor state machine changes • Some critical firmware timing issues • Increased processing speed • Same interference characteristics as • encountered in 802.11b products • Typical QPSK characteristics • Spectral • Adjacent channel interference • Co-channel interference • RF PA backoff from 1dB • compression point Niels Van Erven , 3Com

  5. Technical Summary (3) • Complexity similar to 802.11b • Increased processing speed • No increased gate count • Elimination / bypassing of correlators • Equivalent RF/IF PHY complexity • Simplified equalizer possible due to • decreased range • Throughput almost double 802.11b • slightly less in order to accommodate • interoperability issues (preambles, etc) Niels Van Erven , 3Com

  6. Benefits • Minimal regulatory impact • Best coexistence strategy • Fastest time-to-market • Mature technology • Allows industry to leverage existing • research and investment • Builds on existing customer confidence • Minimizes market confusion while • providing differentiation • Will not be an anticipatory drag on the • 802.11b market Niels Van Erven , 3Com

  7. Issues • Reduced range • Common problem for all approaches • Sufficient for home use • Increased deployment of access points in • business environments • Potential for less interference when widely • deployed • Increased processing power • Common problem for all approaches • Streaming video will introduce higher • utilization rates - interference Niels Van Erven , 3Com

  8. Summary • Best compromise for technology, regulatory, • industry and customer needs • Minimal regulatory impact • Best coexistence strategy with all 2.4GHz users • Fastest time-to-market • Meets burgeoning customer need for speed • Mature technology • Level playing field for industry participants • Lowest risk/investment for best return Niels Van Erven , 3Com

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