1. Submission Title: [Recommended Ranging Signal Waveforms]
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Recommended Ranging Signal Waveforms]
Date Submitted: [25 April 2005]
Source: [Zafer Sahinoglu, Mitsubishi Electric]
Contact: Zafer Sahinoglu
Voice:[ ,
Abstract: [Presents signal waveform options to achieve precision ranging with both coherent and non-coherent receivers]
Purpose: [To discuss which signal waveform would be the most feasible in terms of performance and implementation trade-offs]
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
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2. Suggested Ranging Signal Waveforms
Zafer Sahinoglu
April 25, 2005
Mitsubishi Electric Research labs
Cambridge, MA USA
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3. Features A train of pulses in each frame (PRP)
Enables small pulse amplitudes
Increases coherent-ranging performance
Coarse time-hopping at resolutions of the reference frequency
Provides
additional piconet isolation to coherent receivers
piconet isolation to non-coherent receivers
Increases energy edge detection performance of non-coherent receivers
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4. Ranging Signaling Option-A
320 ns
Multipath tolerance (e.g., 220 ns)
T1 (time-hopping margin) (e.g., 100ns)
Multipath tolerance
M-chip times
T1-TH1
M-chip times
TH1 (e.g. 60ns)
symbol with 0-ns time hopping
symbol with TH1 nanosecond time hopping
A train of pulses in a frame is coarsely time-hopped
TH1 may correspond to the integer multiples of the 1/ (reference frequency)
66MHz => ~ {15, 30, 45, 60,75,90} nanoseconds
Maximum allowable time-hopping interval would be T1.
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5. TG4a Frame index Frame index Energy window index Energy window index
Interference when received according to time hopping sequence TH2 (CM2-49)
Desired user when received according to its own time hoping sequence TH1 (CM2-43)
Frame index
Frame index
Energy window index
Energy window index
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“Desired user (TH1) + Interferer (TH2) ” when received according to the time hoping sequence TH1 (CM2-43 for desired user and CM2-49 for interferer)
“Desired user (TH1) + Interferer (TH1) ” when received according to the time hoping sequence TH1 (CM2-43 for desired user and CM2-49 for interferer)

6. Ranging Signaling Option-B (by Vern)
One Bit
Optionally
Empty
Always Empty
Always Empty 32 32 32
Next potential active time
32 chip times
The Other Bit
Optionally
Empty
Always Empty
Always Empty 32 32 32
Only 160 ns of channel multipath tolerance in this case.
Next potential active time
32 chip times
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We transmit one or the other of these patterns to carry data.

7. Option-C (Particular Case of Option-B)
One Bit
Always Empty
Always Empty
Always Empty
M chip times
The Other Bit
Always Empty
Always Empty
Always Empty
Enough long not to cause IFI
M chip times
Optionally empty slots in Option-B must be converted to “always empty”
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8. Option-C implies time-hopping with a less degree of freedom
TH code: {1,3,3,1,1}
TH code: {1,1,3,3,3}
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9. Option-D (Modified Option-C)
One Bit
TH-freedom
Always Empty
Always Empty
Always Empty
M chip times
The Other Bit TH
freedom
Always Empty
Always Empty
Always Empty
Enough long not cause IFI
M chip times
Optionally empty slots in Option-B must be converted to “always empty”
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10. Summary
Train of pulses placed in frames in a time-hopping manner increases ranging performance of both coherent and non-coherent receivers
Only time-hopping at coarse levels is needed
Options:
Option-A seems to be the most complex
Option C is a particular case of Option-B
Option-D would outperform Option-C in non-coherent under an interfering piconet
Numerical values are for illustrative purposes only
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