1. January 2005
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Wisair-CFP-Response]
Date Submitted: [4 January, 2005]
Source: [Gadi Shor, Sorin Goldenberg] Company: [Wisair]
Address: [24 Raoul Wallenberg st. Ramat Hachayal, Tel-Aviv, ISRAEL]
Voice: [ ] FAX: [ ],
Re: [ a CFP]
Abstract: [ a CFP response]
Purpose: [Response to WPAN a CFP]
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
Gadi Shor, Sorin Goldenberg (Wisair)

2. Proposal: UWB Low Rate Alternate Physical Layer for TG 802.15.4a
<month year>
doc.: IEEE <doc#>
Proposal: UWB Low Rate Alternate Physical Layer for TG a
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

3. Proposal Contents General Overview Proposal Principles
January 2005
Proposal Contents
General Overview
Proposal Principles
Coding & Interleaving
Preamble
Band Management
Implementation
Performance
Evaluation Matrix
Gadi Shor, Sorin Goldenberg (Wisair)

4. General Overview
Gadi Shor, Sorin Goldenberg (Wisair)

5. January 2005
UWB Low Rate
Task Group 4a have issued a call for proposal (CFP) for an alternate Physical layer for:
Low data rate communication
Ranging and location
This proposal is a response to the CFP
The proposal uses the UWB spectrum
The proposal support low data rate communication, ranging and location
Gadi Shor, Sorin Goldenberg (Wisair)

6. January 2005
Proposal Overview
Available spectrum divided into fourteen, 528 MHz sub-bands
Similar to MB-OFDM division for co-existence
Multiple piconet isolation obtained through frequency division multiplexing (FDM) and symbol definition
14 available bands and ability to share the same band
User separation using time division multiplexing (TDM) and time division interleaving (TDI)
Concatenated coding and repetition coding
Dynamic band management for interference mitigation and fading conditions
Scalable transmitter and receiver architecture
Ranging and location can be done using receiver capabilities
Gadi Shor, Sorin Goldenberg (Wisair)

7. Proposal Principles
Gadi Shor, Sorin Goldenberg (Wisair)

8. Band Plan January 2005 Gadi Shor, Sorin Goldenberg (Wisair) BAND_ID
Lower frequency
Center frequency
Upper frequency 1
3168 MHz
3432 MHz
3696 MHz 2
3960 MHz
4224 MHz 3
4488 MHz
4752 MHz 4
5016 MHz
5280 MHz 5
5544 MHz
5808 MHz 6
6072 MHz
6336 MHz 7
6600 MHz
6864 MHz 8
7128 MHz
7392 MHz 9
7656 MHz
7920 MHz 10
8184 MHz
8448 MHz 11
8712 MHz
8976 MHz 12
9240 MHz
9504 MHz 13
9768 MHz
10032 MHz 14
10296 MHz
10560 MHz
Gadi Shor, Sorin Goldenberg (Wisair)

9. Symbol definition Symbol is based on shaped hierarchical sequences:
January 2005
Symbol definition
Symbol is based on shaped hierarchical sequences:
16x8 samples hierarchical sequences
37 samples zero padding suffix (64 samples under study)
528 Mcps/165 samples = 3.2 Msps
Both shaped (flat PSD) and unshaped (constant envelope) allowed
For lower data rates symbols can be sent in a lower duty cycle (can replace transmit power control and save power consumption)
Data is modulated in two dimensions:
Phase modulation (BPSK)
Orthogonal symbol set modulation (M=2) (e.g. A,B and A,-B)
Different interleaving (and coding) for each dimension
Data can be demodulated from a single dimension
May be replaced by differential encoding (under study)
Gadi Shor, Sorin Goldenberg (Wisair)

10. Coding & Interleaving
Gadi Shor, Sorin Goldenberg (Wisair)

11. Error Correction Coding
January 2005
Error Correction Coding
Concatenated coding and repetition coding
Exact scheme under study (ideas welcome)
Allows simple decoding using sub-optimal decoders (e.g. using systematic or reversible encoders)
Coded data is spread over frequency and time for diversity
Gadi Shor, Sorin Goldenberg (Wisair)

12. January 2005
Interleaving Scheme
Coded bits are interleaved before modulation using simple block interleaving
Two different interleaving (and coding) schemes for each modulation dimension
Gadi Shor, Sorin Goldenberg (Wisair)

13. Scrambler Use same scrambler as MB-OFDM standard: PRBS Generator
January 2005
Scrambler
Use same scrambler as MB-OFDM standard:
PRBS Generator
Initial Seed Value
Four initial seed values
Gadi Shor, Sorin Goldenberg (Wisair)

14. Data Rates Raw aggregate data rate is 3.2 Mbps
January 2005
Data Rates
Raw aggregate data rate is 3.2 Mbps
Information aggregate rate determined by
Coding rate
Repetition and Duty cycle
Many possible rates to select from
High aggregate rate allows many low rate users
Each user can have its own coding and spreading rates
Gadi Shor, Sorin Goldenberg (Wisair)

15. Repetition and Duty Cycle factor
January 2005
Data Rates (2)
Mode
Coding Rate
Symbol Rate
[Msym/sec]
Repetition and Duty Cycle factor
Data Rate
[Kbits/sec] 1
3.2 10
320 2
240 3
160 4 40 5 6
640
2.5
Remark: Repetition and Duty Cycle factor is the effective rate NxR after including the symbol duty cycle (i.e. 1 out of N) and the repetition code rate (i.e. 1/R)
Gadi Shor, Sorin Goldenberg (Wisair)

16. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Preamble
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

17. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
January 2005
Preamble Structure
Preamble is based on shaped hierarchical sequences
Preamble uses a cover sequence and frame synchronization sequence
Preamble contains channel estimation symbols for improved reception
Three different preamble lengths supported
Preamble includes symbols for antenna diversity
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

18. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Band Management
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

19. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
January 2005
FDM (14 bands)
Multiple access
Flexibility for world wide regulation
Simple co-existence with existing and future radios
Interference mitigation
Severe fading mitigation
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

20. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Ranging and Location
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

21. January 2005
Ranging and location
Modulation/demodulation scheme allows high resolution estimation of first path (and if needed complete channel)
Used as the basis for the ranging procedure
Can use special frame for improved ranging
Information can be distributed through the communication system to allow location, based on multiple relative ranging operations
See document for relative range estimation algorithm
Gadi Shor, Sorin Goldenberg (Wisair)

22. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Implementation
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

23. January 2005
Transmitter
Many possible architectures (constant envelope or constant PSD, with/without DAC)
No need for I/Q modulator (BPSK)
Can use digital (+/-1), DAC based or analog sequences
Can be implemented using CMOS process
Low power consumption / Small die size / Share MB-OFDM radio
Gadi Shor, Sorin Goldenberg (Wisair)

24. Receiver Many possible architectures
January 2005
Receiver
Many possible architectures
Support for coherent and non-coherent receivers
Tradeoff between complexity and performance
Support analog and digital demodulation
Correlation/de-spreading can be done in analog or digital domains
ADC can work in bit rate, sample rate (or sample rate/8)
Support for architecture with no ADC
Gadi Shor, Sorin Goldenberg (Wisair)

25. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Performance
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

26. Performance Scalable performance Performance meets PAR requirements
January 2005
Performance
Scalable performance
Performance can be enhanced by receiver complexity
Performance meets PAR requirements
Gadi Shor, Sorin Goldenberg (Wisair)

27. January 2005
Summary
Proposed UWB system architecture provides spectrum flexibility for
World-wide regulation
Co-existence with current and future systems
Interference mitigation
Enables low complexity, low power , low cost solution
Good performance in multi-path and with multiple access interference
Enabled by simple implementation
Scalable receiver/transmitter for complexity & power tradeoffs
Gadi Shor, Sorin Goldenberg (Wisair)

28. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Backup Slides
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

29. doc.: IEEE 802.15-<doc#>
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doc.: IEEE <doc#>
Evaluation Matrix
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

30. Self Evaluation – General Solution Criteria
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doc.: IEEE <doc#>
January 2005
Self Evaluation – General Solution Criteria
CRITERIA
Evaluation
Unit Manufacturing Cost (UMC) +
Signal Robustness
Interference And Susceptibility
Coexistence
Technical Feasibility
Manufacturability
Time To Market
Regulatory Impact
Scalability
Location Awareness
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>

31. Self Evaluation – PHY Protocol Criteria
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doc.: IEEE <doc#>
January 2005
Self Evaluation – PHY Protocol Criteria
CRITERIA
Evaluation
Size and Form Factor +
Payload Bit Rate
Packet Overhead
PHY-SAP Throughput
Simultaneously Operation Piconets
Signal Acquisition
System Performance
Link Budget
Sensitivity
Power Management Modes
Power Consumption
Antenna Practicality
Gadi Shor, Sorin Goldenberg (Wisair)
<author>, <company>