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Project: IEEE P802.11b Working Group for Wireless Local Area Networks (WLANs) Submission Title: [MBCK TGg Option] Date Submitted: [ 15 November 2001 ] Source: [ T. O’Farrell, L.E. Aguado & C. Caldwell] Company [Supergold Communication Ltd. ]

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Project ieee p802 11b working group for wireless local area networks wlans

Project: IEEE P802.11b Working Group for Wireless Local Area Networks (WLANs)

Submission Title: [MBCK TGg Option]

Date Submitted:[ 15 November 2001 ]

Source: [ T. O’Farrell, L.E. Aguado & C. Caldwell] Company [Supergold Communication Ltd. ]

Address [ Leeds Innovation Centre, 103 Claredon Road, Leeds 2, U.K. ]

Voice:[ +44 113 233 2052 ], FAX: [ +44 113 233 2032 ], E-Mail:[ tim.ofarrell@supergold.com ]

Re: [ Physical layer modulation proposal for the Higher Rate Extension to 802.11b Standard]

Abstract: [ This contribution is a presentation of Supergold’s MBCK TGg option]

Purpose: [ Proposal for the Higher Rate Extension to 802.11b Standard]

Notice: This document has been prepared to assist the IEEE P802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.11.

O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


Project ieee p802 11b working group for wireless local area networks wlans

“CCK and OFDM” in 2.4 GHz Band Networks (WLANs)

MBCK TGg Option

O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


Outline of the presentation
Outline of the Presentation Networks (WLANs)

  • The case for Single Carrier Modulation

  • The Co-existence Issue

  • The case for MBCK

  • The MBCK Option

O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


Single carrier mbck
Single Carrier MBCK Networks (WLANs)

  • MBCK supports 802.11g’s expected service repetoire by offering 22 and 30 Mbps high rate extensions to CCK using a single carrier modulation technique termed SC-MBCK

  • Under the proposed “CCK and OFDM” scheme, MBCK would operate like CCK in any suggested “Alternating Wireless Medium Access” technique aimed at achieving compatible operation between what would be “CCK/MBCK and OFDM”

O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


Schematic of the sc mbck option

6 Networks (WLANs)

9

12

18

24

36

48

54

Schematic of the SC-MBCK Option

802.11a

802.11b/MBCK

1

DSSS

2

5.5

CCK

11

22

MBCK

30

O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


Project ieee p802 11b working group for wireless local area networks wlans

Single Carrier MBCK Networks (WLANs)

  • This is not the complete picture in the 2.4 GHz ISM Band because there is a coexistence issue caused by Bluetooth (BT) Interference which affects both

    • Single Carrier

    • Multi Carrier

  • 802.15.2 is addressing the coexistence issue using “Collaborative Coexistence” techniques

  • O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    6 Networks (WLANs)

    9

    12

    18

    24

    36

    48

    54

    Collaborative Coexistence

    802.11a

    802.11b/MBCK

    1

    BT

    DSSS

    2

    Erase/

    Mac

    NF/

    Mac

    5.5

    CCK

    11

    22

    MBCK

    30

    NF: Notched Filter (Deterministic frequency excision)

    Erase: Bit Erasures (1 MHz NF  3 erasures)

    MAC: AWMA/MEHTA

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    Single Carrier MBCK Networks (WLANs)

    • In a collaborative coexistence approach SC-MBCK would use the same measures as CCK and benefit in the same way as CCK

    • Under the 802.15.2 recommendations SC-MBCK would be able to continue to offer high rate extensions

    • In the case of OFDM erasurers only at the PHY offer a limited excision of the BT interference

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    802.11a vs. Number of Erasures Networks (WLANs){R = 24Mbps - GMP Channel - SIR = 0 dB}

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    802.11a v. Number of Erasures Networks (WLANs){R = 18Mbps - GMP Channel - SIR = 0 dB}

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    Collaborative Coexistence Networks (WLANs)

    802.11a

    802.11b/MBCK

    1

    6

    BT

    DSSS

    2

    9

    Erase/

    Mac

    NF/

    Mac

    5.5

    12

    CCK

    11

    18

    22

    24

    MBCK

    30

    36

    Vulnerable

    48

    54

    BT Mitigation

    At the PHY OFDM requires additional processing to enhance excision of the BT interference

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    SC-MBCK Networks (WLANs)

    • SC-MBCK is a minimal extension of the single carrier concept used in 802.11b with a straight forward implementation route

    • Re-uses the 802.11b radio

    • Re-uses .11b baseband functionality

    • Shares a common equalisation function with CCK

    • No clock changes with rate adaptation

    • Good system performance

    • Offers 22 and 30 Mbps rates

    • Low low low complexity

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    CCK-OFDM Option Networks (WLANs)

    802.11a

    CCK-OFDM

    802.11b/MBCK

    1

    6

    6

    BT

    DSSS

    2

    9

    9

    Erase/

    Mac

    NF/

    Mac

    5.5

    12

    12

    CCK

    11

    18

    18

    24

    24

    36

    36

    48

    48

    54

    54

    BT Mitigation

    Integrated Performance

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    PBCC Option Networks (WLANs)

    802.11a

    802.11b/MBCK

    1

    6

    BT

    DSSS

    2

    9

    Erase/

    Mac

    NF/

    Mac

    5.5

    12

    CCK

    11

    18

    22

    24

    PBCC

    33

    36

    48

    54

    BT Mitigation

    Robust Performance

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    SC-MBCK Option Networks (WLANs)

    802.11a

    802.11b/MBCK

    1

    6

    BT

    DSSS

    2

    9

    Erase/

    Mac

    NF/

    Mac

    5.5

    12

    CCK

    11

    18

    22

    24

    MBCK

    30

    36

    48

    54

    BT Mitigation

    Low Complexity

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    1 Networks (WLANs)

    DATA IN

    8

    xI

    I OUT

    Select1 of 64Sequences

    1

    6

    c

    d

    RSEncoder

    1

    xQ

    Q OUT

    1

    rI

    Rx I IN

    1

    Greatest

    PeakDetector

    Fast Correlator Bank

    6

    c’

    y

    RSDecoder

    1

    rQ

    DATAOUT

    Rx Q IN

    • MBCK-RS Encoding Chain

    32 Sequences +

    Complements

    64-ary Bi-Code Keying

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.


    Project ieee p802 11b working group for wireless local area networks wlans

    MAC Networks (WLANs)

    22 Mbps

    Base

    Mode

    30 Mbps

    High Rate

    Mode

    MBCK

    MBCK

    RS(63,41)

    RS(63,57)

    MBCK Protocol Stack

    O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.