Transcript 15-04-0081-00-003a-compromise-uwb-interoperability-phy-overview.ppt

February 2004
doc.: IEEE 802.15-04/081r0
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Compromise for UWB Interoperability – PHY Overview]
Date Submitted: [20 February, 2004]
Source: [John McCorkle] Company [Motorola, Inc]
Address [8133 Leesburg Pike]
Voice:[703-269-3000], FAX: [703-249-3092], E-Mail:[john@xtremespectrum.com]
Re: [IEEE 802.15.3a Call For Intent to Present for Ad-Hoc Meeting]
Abstract: [This document provides an overview of a proposed Common Signaling Mode that would allow
the inter-operation or MB-OFDM and DS-UWB devices.]
Purpose: [Promote further discussion and compromise activities to advance the development of the TG3a
Higher rate PHY standard.]
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.
Submission
Slide 1
McCorkle, Motorola
February 2004
doc.: IEEE 802.15-04/081r0
Talking with each other: Basic Requirements
• Each class of UWB devices (MB-OFDM or DS-UWB) needs a
way to send messages to the other type
– MB-OFDM  DS-UWB
– DS-UWB  MB-OFDM
• Even better, design a common signaling mode that can be
understood by either class of devices
• Goal: Minimize additional complexity for each type of device
while enabling this extra form of communications
– Use existing RF components & DSP blocks to transmit message to
“other-class” devices
– Also need to support a low-complexity receiver
– Lower rate mode could be acceptable if it can be used to provide
robust control functions
Submission
Slide 2
McCorkle, Motorola
February 2004
doc.: IEEE 802.15-04/081r0
Interoperability Signal Generation
•
•
•
One waveform that would be straightforward for either class of device
ia a BPSK signal centered in the middle of the “low band” at ~ 4GHz
Such a signal could be generated by both MB-OFDM and DS-UWB
devices using existing RF and digital blocks
MB-OFDM device contains a DAC nominally operating at 528 MHz
– A 528 MHz BSPK (3 dB BW) signal is likely too wide for MB-OFDM band
filters
– DAC an be driven at slightly lower clock rate to produce a BPSK signal that
will fit the MB-OFDM Tx filter
– Result is a 500 MHz wide BPSK signal that a DS-UWB device could receive
& demodulate
•
DS-UWB device contains a pulse generator
– Use this to generate a 500 MHz BPSK signal at lower chip rate
– This signal would fit MB-OFDM baseband Rx filter and could be
demodulated by the MB-OFDM receiver
Submission
Slide 3
McCorkle, Motorola
February 2004
doc.: IEEE 802.15-04/081r0
MB-OFDM & DS-UWB Signal Spectrum with CSM
Compromise Solution
Relative
PSD (dB)
Proposed Common
Signaling Mode Band
(500 MHz bandwidth)
MB-OFDM (3-band)
Theoretical Spectrum
DS-UWB Low Band
Pulse Shape (RRC)
0
-3
-20
3432
3960
3100
4488
5100
Frequency (MHz)
FCC Mask
Submission
Slide 4
McCorkle, Motorola
February 2004
doc.: IEEE 802.15-04/081r0
Conclusions
• The creation of a common signaling mode will allow
co-existence and interoperability between DS-UWB
and MB-OFDM devices
• A Common Signaling Mode is described that:
– Requires minimal additional cost/complexity in MB-OFDM &
DS-UWB
– Achieves desired data rates and robust performance
– Prevents coexistence problems for two different UWB PHYs
– Provides interoperability in a shared piconet environment
Submission
Slide 5
McCorkle, Motorola