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Multiple Sensor Communications MIMO. MESA Meeting. O ur proposal. Provide a low cost system with the necessary throughput Rely on existing standards Increase the system capacity with limited system impact Specialise an existing system to fulfil the MESA like system requirements

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Multiple Sensor Communications MIMO

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Multiple sensor communications mimo

Multiple Sensor Communications MIMO

MESA Meeting


O ur proposal

Our proposal

  • Provide a low cost system with the necessary throughput

    • Rely on existing standards

    • Increase the system capacity with limited system impact

  • Specialise an existing system to fulfil the MESA like system requirements

    • MESA wireless system should cope with many transmissions scenarios

      • Large-short coverage

      • Indoor and out door

  • We propose to adapt the 802.16 standard

    • Increase rate with

    • Limit the system impact at the access point


Mesa transmission context

MESA transmission context

  • Provide high data rate transmission

    • Many propagation scenarios

      • Indoor

      • Indoor to outdoor

      • Outdoor

    • Privilege the uplink

      • Changes form the mass market considerations

  • Coverage

    • Form 100 m to few Km

  • Central access point


Different mimo contexts

Different MIMO contexts

  • Diversity coding & point to point multiplexing

  • Pros

    • Full diversity codes exist (for codes)

    • Rate increase

    • No synchronisation issues

  • Cons

    • No benefit when no diversity (few scatters)

    • Large existing standard modifications

    • Where to put the antennas

  • Multi-user transmissions (multi-point to point)

  • Pros

    • Capacity increase

    • Terminals can be standard (ex: low cost 802.16)

      • Complexity at the access point

    • Works even with no scatters (SDMA like)

  • Cons

    • System synchronisation between the transmitters

      • Exists in TDMA/TDD systems


Operational contexts spatial diversity

Operational contexts : Spatial diversity

The technique should be adapted to the environment

  • No scatters

    + SDMA well suited

    + Multiplexing (multi-point to point)

    - Multiplexing (point to point)

    - Diversity coding

  • Channel with few scatters

    + Multiplexing (multi-point to point)

    Diversity coding

     Multiplexing (point to point)

    - SDMA

  • Channel with many scatters

    + Multiplexing (multi-point to point)

    + Diversity coding

    + Multiplexing (point to point)

    - SDMA


Sub optimal mmse rayleigh channel

Sub optimal MMSE : Rayleigh Channel

  • Normalizing the transmitting power (P constant  nb Tx)

    For a given power the system capacity is increased. Identical performance are achieved compared to the SISO system with a sub-optimal low cost receiver

    Further improvements in range/robustness/coverage are achievable with a little more complexity in the receiver

P

P/3

P/3

P/3

P/4

P/4

P/4

P/4

Eb/No for one user


Conclusions

Conclusions

  • The simultaneous multiple user transmission technique seem the better adapted to increase the capacity of existing standards (802.16)

    • Provides enhancements in all transmission scenarios

      • MESA mainly outdoor or indoor to outdoor

    • Provides large systems improvements with minor changes to existing standards

      • The terminals need a minor layer 1 and 2 modification

    • Privileges the uplink

  • The complexity is deported to the access point

    • Low cost terminals allow larger access to the system


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