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The MIMO Advantage in Broadband Wireless: Transforming Connectivity and Performance

Explore the MIMO (Multiple Input Multiple Output) technology's transformative role in broadband wireless communication. This technology enhances connectivity by allowing multiple signal streams to be transmitted and received simultaneously, significantly improving data rates, capacity, and coverage. The presentation discusses the challenges in wireless communications, including speed and quality constraints, and the impact of MIMO on addressing these challenges. As a pioneer in this field, Iospan Wireless has leveraged MIMO technology to enhance fixed, large-cell broadband access, improving overall performance and user experience.

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The MIMO Advantage in Broadband Wireless: Transforming Connectivity and Performance

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  1. Broadband Wireless The MIMO Advantage A. Paulraj Stanford University & Iospan Wireless Wireless Internet and Mobile Computing SNRC/Accel Symposium Stanford University May 16, 2001

  2. Subscriber Growth 2000 Wireless Subscribers in Millions 1000 Internet 0 1985 2010 2005 1995 Source ITU, Merrill Lynch

  3. Price / Performance Growth Price / Performance in 5 Years P/P Growth in 5 years Moore’s Law 2

  4. Limits to Growth ? Fundamental / Device / Material Limits Today Radio 1 ~ 3 Ghz Source IEEE Proc.

  5. Broadband Vision • Anytime and anywhere connectivity to high quality and high speed multimedia services to support operations at office and home, and to access entertainment, learning, health care, financial, .. services • Single device, uniform, personalized, secure, seamless and portable service

  6. Broadband Wireless - Metrics Traffic: Asynchronous/ Isochronous, average loading (6-10%), low or no error tolerance • User Metric: Time (delay) to down load large files, probability of delay exceeding x2 target • Carrier metrics • Capacity: Number of users per cell (with target download rates) for x MHz spectrum allocation or (BPS* / Hz )/ Cell • Coverage Metric: (BPS* /Hz) x Cell Area

  7. Principal Challenges in Wireless High Quality Seamless High Speed Low Power

  8. Impairments / Constraints Application Constraints TCP Behavior Mixed QoS Variable channel Bursty Traffic Path Loss Fading Co-channel Intf

  9. Channel Impairments 10 5 0 -5 -10 -15 Fading Co-Channel Intf. C I

  10. Challenge of Speed • Deploy more bandwidth, but • Increases spectrum $ • Reduces cell size, increases infrastructure $ • Forces cell splitting, increases infrastructure $ $ ~ Speed 1.5 Speed

  11. Challenge of Quality • Add margin for signal fading ( into noise and co-channel interference) • Reduces cell size, increases infrastructure $ • Reduces reuse (= cell capacity), increases infrastructure $ $ ~ Quality 2 Link Quality (1 - Outage)

  12. Infrastructure Cost Technology ? $ Speed and Quality increases $$ Load /Square Mile

  13. Rx Tx What is MIMO Wireless ? Diversity: Increased Diversity Rx Tx Spatial Multiplexing: Increased rate

  14. Tx Tx R Rx MIMO Leverage in Diversity SISO 1 SISO 1 1 1 MIMO 2 MIMO 2 2 2 5 5 5 5 Rx Reduces Fading Dramatically

  15. Diversity Enables Better Coverage SISO Signal/Noise MIMO Noise Floor Range

  16. Signal / Intf. Ratio Diversity Enables Better Reuse SISO MIMO Interference Aggressive Weak Reuse

  17. Spatial Multiplexing Increases Speed 30 BPS/Hz 4x4 1x1 0 10 dB 20 dB SINR

  18. Past and Present Supernovae ? SNR Set Point 8 dB 4x4 *Over TDMA inMul Access Networks

  19. MIMO Advantage High Power Networks Capacity Coverage Capacity Coverage Low Power Networks 2 3 4 5 Number of Antennas N

  20. Broadband Access Standards 4 Macro Airburst (MIMO OFDM) 802.16 4G ? Micro WCDMA Cell Size (MIMO OFDM) MIMO Hyperlan MIMO Hyperaccess Loc 802.11a 0.2 2 20 200 Data Rate MBPS

  21. Airburst TM - The MIMO Pioneer • Developed by Iospan Wireless for fixed, large cell, broadband access • PHY based on MIMO-OFDM • MAC with packet reservation and advanced scheduling • Very high coverage and spectrum efficiency • IPR Licensed from Stanford University

  22. Summary • High speed and high quality broadband wireless is an emerging opportunity • MIMO technology now widely recognized as a fundamental leverage for improving price/performance • Iospan Wireless has developed core air interface technology for large cell fixed access applications

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