1. May 2003
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Multi-User Support in Designs of UWB Communication Systems ]
Date Submitted: [13 May 2003 ]
Source: [Matt Welborn] Company [XtremeSpectrum, Inc]
Address [8133 Leesburg Pike, Vienna VA, 22182]
Voice:[ ], FAX: [ ],
Re: []
Abstract: [This joint contribution is offered in support of all monopulse candidate Alt PHY Proposals]
Purpose: [The purpose of this document is to provide the Task Group 3a a joint contribution on multi- overlapping piconet performance issues.]
Notice: This document has been prepared to assist the IEEE P 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 P
Welborn, XtremeSpectrum

2. May 2003
Purpose is to address the fundamentals that drive the multi-user capabilities of the predominant TG3A approaches
pulsed sub-band centric approaches
OFDM sub-band approach
DSSS-CDMA centric approaches
Welborn, XtremeSpectrum

3. Multi-user Performance Comparison Two Critical Questions
May 2003
Multi-user Performance Comparison Two Critical Questions
The most important questions for the multi-user mechanism are
What is the multi-user capability in a multipath channel
Critical because we are almost never in the clear!
What is the multi-user capability for extreme near-far
This is the case when the interfering user is very close
Including closer than the desired user
Welborn, XtremeSpectrum

4. We conducted testing at two data rate: 114 Mbps and 200 Mbps.
May 2003
MUI Testing
D int
D ref
Interferer TX
Reference RX
Reference TX
Multi-user testing, as described in IEEE document 03/031r9, clause 5.3, is designed to indicate how many piconets can simultaneously co-existence. Of interest is how far away must be the interfering transmitter from the reference receiver and still achieve satisfactory system operation. The test is graphically shown below.
We conducted testing at two data rate: 114 Mbps and 200 Mbps.
The reference distance was fixed for all testing at 10 meters for 114 Mbps and 4 meters for 200 Mbps.
The system configuration during these tests were:
114 Mbps: Low Band, 16-BOK, ½ rate convolutional FEC, RX NF=4.2 dB
200 Mbps: Low Band, 16-BOK, Reed Solomon[255,223] FEC, RX NF=4.2 dB
Receiver equalization is used to remove reference path intersymbol interference
Welborn, XtremeSpectrum