1. May
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Channel ized, Optimum Pulse Shaped UWB PHY Proposal]
Date Submitted: [May 2003]
Source: [Jonathon Cheah] Company [Femto Devices Inc.]
Address [5897 Oberlin Drive #208, San Diego CA 92121]
Voice:[ ], FAX: [ ],
Re: [.]
[Response to call for Proposal]
Abstract: [This proposal addresses a complete implement able UWB PHY architecture within the FCC UWB rule, and taking into account of the potential feasibility in Silicon fabrication. The proposed PHY shall satisfy the basic 100 Mbps requirement, and the optional requirement of 480 Mbps..]
Purpose: [This proposal is submitted for consideration of IEEE a PHY standard.]
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
Jonathon Cheah, femto Devices Inc.

2. Jonathon Cheah, femto Devices Inc.
Contents
Re statement of design goals
Revisit: PHY Specification summary
Revisit: Channel Plan
Revisit: NII interference co-existence
Piconet co-existence
Length 11 Time Frequency code
Wake-up unique word
Receiver chain
Mode of operation
Channel response
Link budgets
May 2003
Jonathon Cheah, femto Devices Inc.

3. Jonathon Cheah, femto Devices Inc.
Goal
The goal of this design is cost, cost, cost, low DC power consumption, then performance.
The goal is to seek the simplest, and minimum configuration solution to meet the requirements.
This presentation is an extension of the March submission to provide further detail results with respect to channel performance.
May 2003
Jonathon Cheah, femto Devices Inc.

4. Revisit : PHY Specifications Summary
8 basic channel at 800 Mhz bandwidth
Length 11 Time Frequency code
Time multiplexed Receiver chain
Gaussian wave-shaped pulses
OOK modulation for Wake-up sequence
BPSK modulation data transmission.
2 finger Rake receiver followed by Equalizer
FEC Convolution rate ½ code constraint length 7
May 2003
Jonathon Cheah, femto Devices Inc.

5. Revisit-- Channel Plan
Define 8 x 800 Mhz (-4.3 dB BW) channels to cover 3.1 to 10.6 Ghz
FCC defined 10dB BW is 1.2 Ghz per channel.
Channels are: 4.000, 4.800, 5.600, 6.400, 7.200, 8.000, 8.800, Ghz. (~1 Ghz from band edge.)
May 2003
Jonathon Cheah, femto Devices Inc.

6. Basic 8 by 800 Mhz Channel Plan with indoor & Handheld limits
May 2003
Jonathon Cheah, femto Devices Inc.

7. Jonathon Cheah, femto Devices Inc.
802.11A coexistence
Lower NII band can be avoided by missing channel 2
Upper NII band can be avoided by missing channel 3
Time-frequency codes can be used to avoid these channels if needed.
May 2003
Jonathon Cheah, femto Devices Inc.

8. Jonathon Cheah, femto Devices Inc.
Piconets
Independent Piconet is separated by Time frequency code set.
It is possible to extract maximum distance Time-frequency code set for Piconet operation.
10 codes available
May 2003
Jonathon Cheah, femto Devices Inc.

9. Time-frequency code length
The number of independent receiver chain is = Time frequency code length.
The longer the code length, the lower is the PRF, and the lesser the effect of delay spread.
Code length = 4, at 500Mbps can pass basic CM1 to CM4 requirements, ie: The delay spread can be handled by the Rake/Equalizer pair at this rate.
However Code length =11 is used for FCC average power and Piconet requirements
Therefore, receiver chains can be time-multiplexed.
May 2003
Jonathon Cheah, femto Devices Inc.

10. Simple Length 11 Orthonormal Time- Frequency code set
Orthonormality defined as: # 1 2 3 4 5 6 7 8
May 2003
Jonathon Cheah, femto Devices Inc.

11. Jonathon Cheah, femto Devices Inc.
Wake-up /beacon
As the basic receiver structure is complicated, it consumes biggest portion of total DC power. it is desirable to have it off at all time.
Borrow Satellite low detection error Unique Word technique and energy detection to wake-up and provide bit timing.
Propose Maury-Styles length-30 Unique Word
The Unique Word is transmitted in OOK to permit energy detection.
May 2003
Jonathon Cheah, femto Devices Inc.

12. Jonathon Cheah, femto Devices Inc.
Receiver Chain
4 receiver chains are needed.
Pulse repetitive per channel of 8 can be time-multiplexed by 2.
Each receiver chain processes signal according to Time-Frequency code set.
Each receiver chain consists of a 2-finger Rake and a Equalizer
Simplified Matlab simulation files will be provided on request to show that pulse repetitive rate of 4 per channel is sufficient to cope with CM1 to CM4 response.
May 2003
Jonathon Cheah, femto Devices Inc.

13. Receiver block diagram
May 2003
Jonathon Cheah, femto Devices Inc.

14. Jonathon Cheah, femto Devices Inc.
Each receiver chain
May 2003
Jonathon Cheah, femto Devices Inc.

15. Jonathon Cheah, femto Devices Inc.
Mode Of Operation
The receiver is normally off, with only “energy detection xtal set” on.
On receipt of UW sequence, receiver is turned on with bit-timing sync.
BPSK demod is on with non-coherent differential detection, therefore carrier recovery is not necessary.
T-F coder coordinates the reception. MAC layer determines the default channel.
May 2003
Jonathon Cheah, femto Devices Inc.

16. Channel Response Performance
May 2003
Jonathon Cheah, femto Devices Inc.

17. Jonathon Cheah, femto Devices Inc.
Link Budget Table
Ch1
Ch8
Throughput
100
480
Over-the-air bit rate
275
1320
PRF rate 11
Average TX power (PT) dBm
-3.5
-0.5
Tx Antenna gain (GT) dBi
fc: center frequency of waveform Ghz
4.0
9.6
Path loss at 1 meter (L1) dB
44.5
52.1
Path loss at d meter (L2) dB 20
Rx antenna gain (GR) dBi
Rx Power (PR = PT+GT+GR-L1-L2) dBm
-68
-72.6
-64.6
-72.2
Noise bandwidth at antenna port (Mhz)
800
Noise Power (N = *log(Rb)) dBm
-89.6
-82.8
Rx Noise Figure (NF) dB 7
Rx Noise Power (PN = N+NF) dBm
-82.6
-75.8
Processing Gain (PG) 1
Minimum C/N (S) dB 6
Link Margin (M = PR + PG –PN- S)
5.6
1.0
2.2
-5.4
Proposed Minimum Rx sensitivity level dBm
-75
May 2003
Jonathon Cheah, femto Devices Inc.

18. Link Budget calculation example for
May 2003
Jonathon Cheah, femto Devices Inc.