Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Status report of the 802.15.4a channel modeling subgroup] Date Submitted: [11 May, 2004] Source: [Andreas F. Molisch] Company [Mitsubishi Electric] Address [201 Broadway, Cambridge, MA] Voice [617 621 7558] E-Mail: [ Andreas.Molisch@ieee.org ] Re:[Contributions on UWB Channel Models] Abstract: [This contribution describes the status of the IEEE 802.15.4a channel modeling subgroup, the currently envisioned generic model structure, and an outlook for future work ] Purpose: [] Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. Mitsubishi Electric Research Labs

2. Contents • Background • Unified measurement procedure • Data extraction methods • Interaction with SG4a plenary Mitsubishi Electric Research Labs

3. Background • Subgroup established in Singapore (Sept. 2003) • Mandate: establish a channel model for system evaluation of a 802.15.4a standard • Timeline: finish by end of June 2004 • Considered bandwidth: 2-10 GHz • Model has to work for UWB as well as non-UWB proposals that fulfill the CFA requirements • UWB will be among the proposals • Any UWB model can be downfiltered to a narrowband system • 2.45 GHz ISM band should be included in the considered range • Working mode: biweekly teleconferences • Very informal approach (within the rules of IEEE): participants always welcome Mitsubishi Electric Research Labs

4. Generic model structure • Generic structure finalized end of March • Saleh-Valenzuela model • Small-scale fading is Nakagami or Rice distributed • Discrete components with Poisson arrival rates with varying rates; plus diffuse background • Changes since Orlando: • Number of clusters is Poisson-distributed random variable • Some environments might not be parameterized due to lack of data Mitsubishi Electric Research Labs

5. Measurement procedure • Allow distinction of • Small-scale fading • Shadowing • Pathloss • Measurement in a grid best suited; but grid distance is different for small-scale statistics and extraction of directional info Mitsubishi Electric Research Labs

6. Extraction of small-scale parameters • VNA measurements lead to smearing of small-scale parameters • IF bandwidth should be set to maximum value • Extraction of Nakagami-m factor from measurements: after literature review, easy-to-implement and accurate method found Mitsubishi Electric Research Labs

7. Extraction of SV parameters • First step: data averaging and noise reduction • Manual cluster identification, as automated techniques are not robust • Extraction of parameters for overlapping clusters like in 802.11.n Mitsubishi Electric Research Labs

8. Interaction with SG4a plenary • Minutes of teleconferences are sent out to SG4a reflector • Status reports at every 4a meeting – but problems with document uploading • Currently investigating to have model cover the 2.4GHz band • Group is on track for submitting final report end of June Mitsubishi Electric Research Labs