1. TGad Channel Model Requirements
Month Year
doc.: IEEE /xxxxr0
March 2009
TGad Channel Model Requirements
Date:
Authors:
Vinko Erceg, Broadcom
VInko Erceg, Broadcom

2. Outline 802.15.3c Channel Model Description
March 2009
Outline
c Channel Model Description
c Channel Model Discussion
Propagation Environments of Interest
Proposed Requirements for TGad Channel Models
Vinko Erceg, Broadcom

3. 802.15.3c Channel Model Description (1)
March 2009
c Channel Model Description (1)
The statistical channel models [1] developed by the IEEE c 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

4. 802.15.3c Channel Model Description (2)
March 2009
c Channel Model Description (2)
Channel Model
Scenario
Environment
Descriptions
CM1
LOS
Residential
Typical home with multiple rooms and furnished with furniture, TV sets lounges, etc. The size is comparable to the small office room. The walls/floor are made of concrete or wood covered by wallpaper/carpet. There are also windows and wooden door in different rooms within the residential environment.
CM2
NLOS
CM3
Office
Typical office setup furnished with multiple chairs, desks, computers and work stations. Bookshelves, cupboards and whiteboards are also interspersed within the environment. The walls are made by metal or concrete covered by plasterboard or carpet with windows and door on at least one side of the office. Cubical, laboratory, open and closed office can be treated as a generic office. Typically these offices are linked by long corridors.
CM4
CM5
Library
Typical small size library with multiple desks, chairs and metal bookshelves. Bookshelves are filled with books, magazines, etc. Some tables and chairs were interspersed between the bookshelves. At least one side of room has windows and/or door. The walls are made of concrete.
CM6
CM7
Desktop
Typical office desktop and computer clutter. Partitioning surrounded this environment
CM8
CM9
Kiosk
Typical kiosk server with human body holding a portable device. The portable device is pointed to the kiosk server.
Vinko Erceg, Broadcom

5. 802.15.3c Channel Model Discussion (1)
March 2009
c 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 c channel modeling group may be reused in the 60 GHz TGad channel model.
However, the reuse of the IEEE c 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

6. 802.15.3c Channel Model Discussion (2)
March 2009
c Channel Model Discussion (2)
c 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

7. 802.15.3c Channel Model Discussion (3)
March 2009
c Channel Model Discussion (3)
Due to differences in the approaches to statistical channel modeling, c 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

8. Propagation Environments of Interest for TGad
March 2009
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

9. Proposed Requirements for TGad Channel Models
March 2009
Proposed Requirements for TGad Channel Models
Adopt the general structure of the c models and add the following features:
Support for steerable directional antennas at both the TX and RX sides (i.e. both AoAs and AoDs)
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

10. March 2009
References
[1] Su-Khiong Yong “TG3c Channel Modeling Sub-committee final report,” IEEE doc r1.
[2] A. Maltsev et al. “Channel Modeling for 60 GHz WLAN Systems,” IEEE doc r1.
[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 c.
[5] A. Bourdoux, S. Derore, J. Nsenga, W. Van Thillo, “PHY Layer Submission for c”, IEEE c.
[6] Eldad Perahia “TGad Evaluation Methodology,” IEEE doc r0.
[7] Andrew Myles and Rolf de Vegt “Liaison from Wi-Fi Alliance to regarding WFA VHT Study Group Consolidation of Usage Models,” IEEE doc r4.
Vinko Erceg, Broadcom

11. March 2009
Straw Poll
Would you support the TGad channel model requirements outlined on the previous slide?
Yes/No/Abs
Vinko Erceg, Broadcom