6/29/2005
Doc: IEEE 15-05-0355-03-004a
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Project: IEEE P802.15 Working Group for Wireless Personal Area
Networks
(WPANs)
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Submission Title: [Definition of Parameters and selection criteria for TG4a
Band Plan ]
Date Submitted: [21 June 2005]
Source: [Saeid Safavi, Wideband Access Inc.]
Contact: Saeid Safavi.
Voice:[+1 858 642 9114, E-Mail: [email protected]]
Abstract: [Band Plan parameters, prioritized list of Band Plan selection
criteria]
Purpose: [Clarification of definition of critical parameters such as pulse rate
and chip rate as well as a prioritized list of criteria for selection of the band
plan]
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.
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TG4a
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Saeid Safavi Wideband Access, Inc.
6/29/2005
Doc: IEEE 15-05-0355-03-004a
UWB Signal Parameter Definitions
Definition
Parameter
Chip
The minimum time resolution of a UWB signal, whose rate is considered
as the minimum sampling rate of the signal (complying with the Nyquist
sampling theorem), i.e. closest allowable distance between successive
pulses
Pulse
A radiated short transient UWB signal whose time duration is associated
with the reciprocal of its UWB -10 dB BW , i.e. the shortest waveform
Effective Pulse
Duration
An interval which is defined by the effective portion of the pulse energy
with a time duration which is the reciprocal of the -10 dB BW of the UWB
signal
Burst
Group of Pulses
Symbol
Group of Bursts
Channel
Separation
The difference between the center frequencies of each channel (its
relation to chip rate is not yet defined)
PRF
The frequency of repetition of Pulses or Pulse Repetition Frequency
BRF
The frequency of repetition of bursts (group of pulses ) or Burst
Repetition Frequency
PRI, BRI
Reciprocal of PRF and BRF respectively
TG4a
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Saeid Safavi Wideband Access, Inc.
6/29/2005
Doc: IEEE 15-05-0355-03-004a
Illustration of Pulse and Chip Definitions
One Pulse
PULSE: shortest waveform
One Chip
CHIP: closest allowable distance
between successive pulses
TG4a
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Saeid Safavi Wideband Access, Inc.
6/29/2005
Doc: IEEE 15-05-0355-03-004a
Illustration of UWB (baseband) Signal Parameter Definitions
Symbol Duration
Burst Duration
Pulse Duration
Pulse
Burst
Symbol
(1 or more pulses)
(1 or more bursts)
Burst Repetition Interval
(BRI, assuming one Burst per symbol)
Inverse
Relation
Effective
Pulse
Duration
3 dB BW
BRF
-3 dB
Chip
Duration
-10 dB
-20 dB
-30 dB
-40 dB
Inverse
Relation
-50 dB
-60 dB
-70 dB
10 dB BW
TG4a
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Saeid Safavi Wideband Access, Inc.
6/29/2005
Doc: IEEE 15-05-0355-03-004a
Prioritized Band Plan Selection Criteria
Priority
Criterion
1
Margin from 3.1 GHZ (FCC Compliance), the larger, the better → to address out-of-band interference
2
Margin from 4.9 GHZ (Co-existence with WLAN), the larger, the better → to address out-of-band
interference
3
It is preferred that the center frequencies of the 3 bands be integer multiple of the Chip Rate or the
channel separation, Burst Rates (BRF’s) and PRF’s → to address ease of implementation/lower cost
4
PRF’s, BRF’s ,Channel Separation or Chip Rate, and Center Frequencies can be generated by a VCO
using a Single PLL → to address ease of implementation/lower cost
5
SOP Support:
1.Via Channel Separation
2.Via Pulse Compression
→ to address larger number of SOP’s
6
Support of Xtal frequencies (12, 13, 9.6 and their multiples) → to address ease of implementation
/lower cost
7
Primary division(s) in PLL implementation is 2, the more initial divide by 2 divisions, the better
→ to address ease of implementation/lower cost
8
Coexistence with WiMedia and UWBforum through Center Frequencies and other means
→ to address coexistence
9
Each sub-band’s bandwidth does not have to be related to the separation between the center
frequencies (channel separation) and is defined by pulse shape
→ to address ease of implementation/Definition of UWB signal based
10
Above 6 GHz band plan → to address future implementations
11
Coexistence with other Standards (IEEE or Non-IEEE) → to address coexistence
TG4a
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Saeid Safavi Wideband Access, Inc.