1. March, 2003
doc.: IEEE /127r0
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Alternate PHY Proposal for High Rate Draft Standard]
Date Submitted: [2 March, 2003]
Source: [Yasaman Bahreini, John Santhoff] Company [Pulse~LINK]
Address: [9155 Brown Deer Rd. Suite 8, San Diego, CA 92121]
Voice:[(858) ], FAX: [(858) ],
Re: [IEEE CFP; Doc. IEEE /372r8]
Abstract: [This presentation provides overviews for Pulse~LINK’s proposal for High Rate a Draft Standard]
Purpose: [Response to Doc. IEEE /372r8]
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
Submission

2. Alternate PHY Proposal for High Rate IEEE 802.15.3 Draft Standard

3. Outline PHY-Layer Overview Modulation Scheme Modes of Operation
Operating Frequency & Spectral Mask
Link Budget
Interference
Coexistence

4. PHY-Layer Overview Achieves TG3a technical system requirements
Low complexity modulation scheme
Provides scalability for different channel conditions
Adequate interference rejection
Improved multipath immunity
Capable of position/location services
Coexistence with other IEEE derived systems and future UWB standards achieved through common discovery protocols

5. Modulation Scheme: Ternary
Ternary modulation scheme is :
An OFDM modulation of order 2
A spread spectrum Walsh-Hadamard system of order 2
Ternary symbol conveys 2 information bits.
Input-output relationship
Input
Output
a2n
a2n+1
b2n
b2n+1 1 +1 -1

6. Modulation Scheme (cont’d)
Interesting characteristics of ternary modulation
One of the output pair bits is always zero and the other is ±1:
Compared to BPSK, the average effective PRF is
reduced by a factor of 2
Simple transmitter architecture
Allows a variety of Suboptimal receivers
No need for an DAC
Better immunity against multipath channel conditions

7. Modes of Operation Payload DR = Rsymbol * NCBPS * r / (1 + 0.125)
1 All data rates are per band of operation.

8. Operating Frequency & Transmit Spectral Mask
FCC Compliant Tx powers. Ref. Ultra Wideband First Report and Order, Doc.: FCC
One mandatory and one optional frequency bands of 1.45 MHz each within GHz unlicensed spectrum:
Mandatory band: GHz – GHz (shown to the right)
Optional band: GHz – GHz
This guarantees coexistence with IEEE b/a, IEEE , and IEEE
* Tx spectral mask shown above is relative to the
allowed FCC Tx level above 3.1 GHz.

9. Link Budget

10. Interference
Interferer devices in the ISM (2.4GHz) and UNII bands are out of band and suppressed:
Rejection at 2.4 GHz : 55 dB
Rejection at 5.3 GHz : 35 dB

11. SIR vs. Distance From Previous Plot: Required SNIR for 120 Mbps = 2dB
SIR = 5 dB  a) Not a limiting factor
b) Distance is limited to below 1.5 m
(a)
(b)

12. Coexistence
UWB coexistence traditionally is concerned with UWB TX to Narrow-Band RX.
What about UWB Air Interface to “Alternate” UWB Air Interface?
UWB is gaining momentum and there is a very high likely hood that multiple UWB based PHY layers will come into usage. Already a and are looking at UWB PHY’s
We need some form of “Etiquette” to manage peaceful UWB coexistence of different UWB PHY layers
What we do today could potentially set the path for UWB evolution for decades to come
As this happens, a common discovery protocol is necessary