1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
October, 2005
Project: IEEE Study Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Temporal and Spectral Properties of TG4a Modulation Waveform]
Date Submitted: [October 2005]
Source: [Shahriar Emami and Celestino A. Corral]:
Company1 [Freescale Semiconductor]
Address [Freescale Semiconductor, Inc Broken Sound Pkwy., N.W. Suite 1
Boca Raton, FL  ]
Voice: [(561) ]
Re: [ a]
Abstract: [Captures the temporal and spectral behavior of TG4a modulation.]
Purpose: [To assist designers in determination of modulation parameters]
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
Shahriar Emami, Freescale Semiconductor
<author>, <company>

2. Modulation [15-05-0528-00-004a] October, 2005
Shahriar Emami, Freescale Semiconductor

3. Transmitter Architecture
October, 2005
Transmitter Architecture
Shahriar Emami, Freescale Semiconductor

4. October, 2005
Transmitted Waveform
PAPR of the waveform is a function of code sequence, pulse shape and the duty cycle of the UWB signal.
Shahriar Emami, Freescale Semiconductor

5. October, 2005
FEC 1, FEC 2 and FEC 3 [ a]
~1000ns
Code is ~125 ns long. PAPR of code turns out to be 8.5 (9.2 dB).
PAPR=9.2+10*log10(4)=15.2 dB
Shahriar Emami, Freescale Semiconductor

6. October, 2005
FEC 4 [ a]
~1000ns
Code is ~250 ns long. PAPR of code turns out to be 17 (12.2 dB).
PAPR= *log10(4)=18.2 dB
Shahriar Emami, Freescale Semiconductor

7. October, 2005
FEC 5 [ a]
~1000ns
Code is ~250 ns long. PAPR of code turns out to be 17 (12.2 dB).
PAPR= *log10(4)=18.2 dB
Shahriar Emami, Freescale Semiconductor

8. Convolutional Encoder
October, 2005
FEC Options [ a]
PRF = 494 MHz
PRF= 494 MHz  PAPR= log(64) = 19.5 dB
Coherent Receiver: Convolutional code Rate = 1/3
Non Coherent Receiver: Convolutional code Rate = 1/2
Convolutional Encoder
K= 3,4 or 5
R= 1/3
FEC 6
Shahriar Emami, Freescale Semiconductor

9. PSD of the transmitted waveform
October, 2005
PSD of the transmitted waveform
~1.5 dB
averaged over 1 msec
Shahriar Emami, Freescale Semiconductor

10. October, 2005
Summary
The PAPR of the modulation waveform varies between 15 to 19.5 dB depending on the selected PRF.
The PSD of the transmitted waveform averaged over 1 ms shows about 1.5 dB spectral variation.
Shahriar Emami, Freescale Semiconductor