MIMO-LTE A relevant Step towards 4G - 3G, 4G ?? MIMO-Workshop • MIMO Seminar • LTE Seminar ... MIMO-WiMAX MIMO-LTE MIMO-.16m MIMO- “MIMO-LTE – A relevant step

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  • MIMO-LTE A relevant Step

    towards 4GProf. Dr.-Ing. Thomas Kaiser

    CEO

    mimoOn GmbH

    MobiMedia, August 27-29, 2007

  • 2 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    mimoOn is

    a supplier of embedded communications software for the next generation of MIMO-based wireless communication standards.

    Check www.mimoOn. deSept. 11-14, 2007:

    MIMO-Workshop MIMO Seminar LTE Seminar

  • 3 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Edholms law of data rate:

    What means 4G ?

    Magic Mobile Future Study: >2 GHz BW in 2020

    OFDM will comeMIMO will come

  • 4 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    The Future of MIMO

    High-speed mobile access requires MIMO

    201520102005200010 kb/s

    100 kb/s

    1 Mb/s

    10 Mb/s

    100 Mb/s

    1000 Mb/s

    GSM

    GPRS

    EDGE

    UMTS

    1xEV-DO

    HSPA

    MIMO-WiMAXMIMO-LTE

    MIMO- .16m

    MIMO-

  • 5 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    The History of MIMO

    1987 1st MIMO paper (Winters) 1991 1st MIMO patent (Paulraj) 1995 MIMO channel capacity (Telatar, Foschini, Gans)1996 1st MIMO testbed1999 1st MIMO prototype chip2002 1st MIMO company2005 1st MIMO commerc. chip2006 MIMO breakthrough

  • 6 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO Principles

    Array Gain: +3dB p.D. for SIMO, MISO (PCSI), MIMO (PCSI))Diversity Gain: +XdB for SIMO, MISO, MIMO (CSI helps)Interf. Cancell. Gain: Nulling for SIMO, MISO, MIMO (all PCSI)Multiplexing Gain: for MIMO (CSI helps)

    MISO

    MIMO

    SISO

    Challenge: Gain Tradeoffs under Hardware, Regulation, and Standardization Constraints

  • 7 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Separate Frequency Flat Channels

    Tx Rx

  • 8 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Equivalent Parallel Channels

    Equivalent channel

  • 9 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Open Loop vs. Closed Loop

    Tx Rx

    Closed Loop: (Diversity order max. )

    Challenge: Low rate feedback, high mobility

  • 10 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO-LTE Transmitter (DL)

    # of modulated codewords per

    subcarrier

    Tx1

    # of layers# of Tx

    # of subcarriers

    one resource block

    LayerMapping

    LayerMapping

    LayerMapping

    LayerMapping

    common H1

    Diversity

    Precoder P1cyclic delay

    Precoder P1cyclic delay

    LayerMapping

    LayerMapping

    LayerMapping

    LayerMapping

    common HLPrecoder PLcyclic delay

    Precoder PLcyclic delay

    Tx1IFFTaddCP

    Tx2IFFTaddCP

    Tx3IFFTaddCP

    Tx4IFFTaddCP

    Tx2 Tx3 Tx4

    Diversity

    Diversity

    Diversity

    subcarrier 1

    subcarrier K

    subcarrier N

  • 11 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO-LTE Receiver (DL)

    # of layers# of Rx# of code-words

    (CW) per subcarrier

    one resource block

    common H1B1

    ReceiveBeamformer

    B1Receive

    Beamformer

    Rx1FFTremCP

    Rx2FFTremCP

    Rx3FFTrem.CP

    Rx4FFTrem.CP

    (ST)-MIMO Detector

    BLReceive

    Beamformer

    BLReceive

    Beamformer

    (ST)-MIMO Detector

    common HL(ST)-MIMO Detector

    (ST)-MIMO Detector

    (ST)-MIMO Detector

    (ST)-MIMO Detector

    (ST)-MIMO Detector

    Rx1

    Rx2

    Rx3

    Rx4

    # of subcarrier

    Detection: ~(#CW)2 x MR x

    1200 MAC / (0.5ms/7) = (#CW)x

    (#CW+MR)x16,8 MMACps

    # of subcarrer

    (#antennas) x 210 x 11 x 4/(0.5 / 7)ms =

    (#antenna) x 630 MMACps

    channel update: (once per RB) ~ 1200 / 12 /

    0.5ms x MR x MT2 MAC= 0.2 x MR x MT2

    MMACps

  • 12 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO-LTE Algorithms

    Challenge: MIMO Detector

    No. of Antennas ?

    X-QAM ?

    Hard/Software ?

  • 13 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO-LTE Receive Chain Requirements

    RF Freq Offs CorrectionCycl Prfx Remove FFT

    Freq Offs Estimation

    Synchroni-zation

    De-mux

    Chan Est MIMO Detector

    30.72 MCSps(1.47 Gbps)

    28.67 MCSps(1.38 Gbps)

    16.8 MCSps(538 Mbps)

    Rx1

    Rx2

    Data / Rxbps with Rx=2

    50 Mbps(100 Mbps)

    Data / Txbps with Tx=2

    16.8 MSps(300 Mbps)

    100 Msbps(600 Mbps)

    100 Mbps

    123 MMACps(246 MMACps)

    Symbol Demapper

    De-Inter-leaver

    Channel DecoderM

    UX

    RF Freq Offs CorrectionCycl Prfx Remove FFT

    De-mux

    269 - 538 MMACps

    Symbol Demapper

    De-Inter-leaver

    Channel Decoder

    76.8 GACSps(153.6 GACSps)

    2x12 2x10

    9

    3

    CSps: Complex Sample per secondSbps: soft bits per second

    #Rx = 2#Tx = 2

    MAC: Multiply AccumulateACS: Add Compare Select

    CSps: Complex Sample per secondsbps: soft bits per second MAC: Multiply AccumulateACS: Add Compare Select

    631 MMACps(1262 MMACps)

    No ML algorithmfor 64QAM

    Configuration: 2 Rx, 2 Tx, 64QAM, 100 Mbps data rate, Turbo Coding 1/3,

  • 14 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Some Results: MIMO-OFDMA

    1134

    0.20Ratio of Users among CoveredUsers 0.15

    0.10

    0

    4536 9072 13608

    Net data rate in kb/s

    2x3 MIMO-OFDMAReuse=1, TX=10W, Isolated Cell2MHz BandwidthSpatial Mux with 64 QAM (equiv. 4096 SISO-QAM)12dB better link budget than for SISOIospan Wireless, San Jose Testbed, 2001Thanks to Prof. A. Paulraj (Stanford Univ.)

  • 15 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Some Results: Cellular MIMO

    Challenge: MIMO-Algorithm Design

    2

    bit

    /s/

    Hz

    0

    Peak rate

    Mean rate

    Cell edge rate

    1

    SISO 2x2 MIMO

    Isolated CellSISO 2x2 MIMO

    Interf. Lim. Cell

    Sourc

    e: 3

    G a

    mer

    icas,

    M

    obile

    Bro

    adban

    d:

    The

    Glo

    bal

    Evo

    lution o

    f U

    MTS/H

    SPA

    , D

    ec 1

    4,

    2006

  • 16 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO-Femtocell-Scenario

    MIMO is well-suited for contained environments100 Mbit/s feasible with femtocellsMIMO-Femtocells similar to MIMO-WLAN

  • 17 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    MIMO 2x2 SISO

    Source: Throughput of a MIMO OFDM based WLAN system, T. Schenk et. al., IEEE SCVT2004, Gent, Belgium, Nov. 2004

    MIMO-LTE vs MIMO-WLAN

    30 m ~ 100 m2.8 km ~ 7.4 km Coverage

    < 5 ms10 msLatency (round trip)

    > 200 Mbps100 (DL) / 50 (UL) MbpsTheoretical peak bit rate in

    ideal case

    Weak supportGood supportQoS

    CSMA/CAOFDMAAccess technology

    64 /312.5 kHz

    128 ~ 2048 /15 kHz

    FFT and Subcarrier Spacing

    Packet data

    Fixed20 MHz

    SFBC, SM, Beamforming

    OFDM

    pre802.11n

    Packet data, VoIPServices

    Scalable1.25 ~ 20 MHz

    System Bandwidth

    SFBC, SM, BeamformingMIMO mode

    OFDMModulation technique

    MIMO preLTE

  • 18 / 18MIMO-LTE A relevant step towards 4G, Thomas Kaiser, MobiMedia, August 27-29, 2007

    Conclusion

    to increase user capacity to increase coverage to increase cell throughput

    MIMO represents an economical way to

    the potential of using the spatial domain is large and the development of new and even more efficient multi-antenna algorithms is expected to continue in the future.

    Source: 3G americas, Mobile Broadband: The Global Evolution of UMTS/HSPA, Dec 14, 2006