Tgad channel model requirements
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TGad Channel Model Requirements. Date: 2009-03-10. Authors:. Outline. 802.15.3c Channel Model Description 802.15.3c Channel Model Discussion Propagation Environments of Interest Proposed Requirements for TGad Channel Models . 802.15.3c Channel Model Description (1).

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TGad Channel Model Requirements

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Tgad channel model requirements

TGad Channel Model Requirements

Date: 2009-03-10

Authors:

Vinko Erceg, Broadcom


Outline

Outline

  • 802.15.3c Channel Model Description

  • 802.15.3c Channel Model Discussion

  • Propagation Environments of Interest

  • Proposed Requirements for TGad Channel Models

Vinko Erceg, Broadcom


802 15 3c channel model description 1

802.15.3c Channel Model Description (1)

  • The statistical channel models [1] developed by the IEEE 802.15.3c group included the following features:

    • LOS and NLOS components

    • Based on the generalized Saleh-Valenzuela channel model with clustering in both the time and angular domains

    • Cluster arrivals and intra-cluster ray arrivals are modeled with two Poisson random processes.

    • Cluster amplitudes and intra-cluster ray amplitudes are modeled with log-normal random processes.

    • The cluster angle-of-arrival (AoA) has a uniform probability density. The AoAs of different clusters are independent.

    • The individual AoA of each ray within each cluster has either Gaussian or Laplacian density.

Vinko Erceg, Broadcom


802 15 3c channel model description 2

802.15.3c Channel Model Description (2)

Vinko Erceg, Broadcom


802 15 3c channel model discussion 1

802.15.3c Channel Model Discussion (1)

  • We believe the general approach used to create the channel models, based on the extended time-angular S-V model, is valid. Some of results obtained by the IEEE 802.15.3c channel modeling group may be reused in the 60 GHz TGad channel model.

  • However, the reuse of the IEEE 802.15.3c channel modeling results is complicated by the fact that no raw channel measurement data, except for the IMST company data used to generate the library model, are available [2].

Vinko Erceg, Broadcom


802 15 3c channel model discussion 2

802.15.3c Channel Model Discussion (2)

  • 802.15.3c channel model provides limited support for evaluating beamforming performance:

    • Angle-of-Departure (AoD) is not included in the .15.3c channel models and the AoA model only describes the azimuth angle (no elevation information)

  • There is no support for polarization characteristics:

    • As was shown in [3], the degradation due to polarization mismatch can be as high as 20 dB

  • There is no support for non-stationary, human body blockage effects which can have a strong impact on 60 GHz devices

Vinko Erceg, Broadcom


802 15 3c channel model discussion 3

802.15.3c Channel Model Discussion (3)

  • Due to differences in the approaches to statistical channel modeling, 802.15.3c decided to prepare golden data sets (instead of Matlab code) for the channel realizations that were used in proposal evaluation.

  • The golden sets were prepared for only a subset of the channel models (CM1, CM2 and CM3) that included some “extraordinary” realizations that produced a BER “floor” for some channels [4, 5].

Vinko Erceg, Broadcom


Propagation environments of interest for tgad

Propagation Environments of Interest for TGad

  • Three environments are considered in accordance with the evaluation methodology proposal [6]:

    • Residential living room

    • Conference room

    • Cubicle environment

  • Adding more environments may unnecessarily complicate the channel model development:

    • Most of the TGad usage models [7] can be related to the above three environments

    • Measurements may not be available for other environments

Vinko Erceg, Broadcom


Proposed requirements for tgad channel models

Proposed Requirements for TGad Channel Models

  • Adopt the general structure of the 802.15.3c models and add the following features:

    • Support for steerable directional antennas at both the TX and RX sides (i.e. both AoA and AoD distributions)

    • Polarization characteristics of antennas and signals

    • Non-stationary/human body blockage effects

  • Consider three propagation environments:

    • Residential living room

    • Conference room

    • Cubicle environment

Vinko Erceg, Broadcom


References

References

  • [1] Su-Khiong Yong “TG3c Channel Modeling Sub-committee final report,” IEEE doc. 15-07-0584r1.

  • [2] A. Maltsev et al. “Channel Modeling for 60 GHz WLAN Systems,” IEEE doc. 11-08-811r1.

  • [3] A. Maltsev et al. “Channel Modeling for 60 GHz WLAN Systems,” Intel Workshop on mmWave Networking: Applications, Advances and Challenges, October 7, 2008.

  • [4] A. Maltsev, R. Maslennikov, A. Khoryaev “Comments on CM3.1 golden set”, IEEE doc. 15-07-0715-00-003c.

  • [5] A. Bourdoux, S. Derore, J. Nsenga, W. Van Thillo, “PHY Layer Submission for 802.15.3c”, IEEE 802.15-0691-01-003c.

  • [6] Eldad Perahia “TGad Evaluation Methodology,” IEEE doc. 11-09-0096r0.

  • [7] Andrew Myles and Rolf de Vegt “Liaison from Wi-Fi Alliance to 802.11 regarding WFA VHT Study Group Consolidation of Usage Models,” IEEE doc. 11-07-2988r4.

Vinko Erceg, Broadcom


Straw poll

Straw Poll

  • Would you support the TGad channel model requirements outlined on the previous slide?

    Yes 60/No 0/Abs 2

Vinko Erceg, Broadcom


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