1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
March 2006
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [PHY Performance Comparison between 15.4a CSS and 15.4 DSSS]
Date Submitted: [6 March, 2006]
Source: [(1) Kyung-Kuk Lee, et al, (2) Rainer Hach, et al]
Company [(1) Orthotron Co., Ltd., (2) Nanotron Technologies]
Address [(1) 709 Kranz Techono, Sangdaewon-dong, Jungwon-gu, Sungnam-si, Kyungki-do, Korea , (2) Alt-Moabit 60, Berlin, Germany]
Voice:[(1) , (2) ], FAX: [],
[(1) (2)
Re: []
Abstract: []
Purpose: [Submit simulation results on range and robustness of these modulations]
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
Hach, Lee
<author>, <company>

2. Kyung-Kuk Lee / Jong-Wha Chong, Sang-Hun Yoon, Jin-Doo Jung
March 2006
PHY Performance Comparison
between 15.4a CSS and 15.4 DSSS by
Kyung-Kuk Lee / Jong-Wha Chong,
Sang-Hun Yoon, Jin-Doo Jung
Orthotron Co., Ltd. / Hanyang Univ., Korea
&
Rainer Hach
Nanotron Technologies
Hach, Lee

3. Table of contents Theoretical PER performance over AWGN channel
March 2006
Table of contents
Theoretical PER performance over AWGN channel
Assumptions for simulations
15.4 DSSS over Exponential Diffuse Channel
15.4a CSS over Exponential Diffuse Channel
Conclusion
Hach, Lee

4. Theoretical PER Performance over AWGN Channel
March 2006
Theoretical PER Performance over AWGN Channel
Formula for 15.4 DSSS: 16 ary, orthogonal
Formula for 15.4a CSS: Biorthogonal coded, see a
Hach, Lee

5. Assumptions for simulations
March 2006
Assumptions for simulations
Floating point simulation of optimum non-coherent demodulator.
Detection based on largest correlation peak (largest path) … No RAKE or equalizer.
Assume channel is constant throughout packet (quasi-static) and uncorrelated from packet to packet.
20 Bytes per packet
Sampling rate for 15.4 DSSS: 16 MHz
Sampling rate for 15.4a CSS: 32MHz
Diffuse channel model as introduced in b
Hach, Lee

6. March 2006
15.4 DSSS Performance over Exp. Diffuse Ch. according to b
Trms
100ns
>22dB
200ns
300ns
>23dB
400ns
>27dB
500ns
>38dB
Hach, Lee

7. 15.4a CSS Performance over Exp. Diffuse Ch. (1Mbps)
March 2006
15.4a CSS Performance over Exp. Diffuse Ch. (1Mbps)
Trms
100ns
<17dB
200ns
<15dB
300ns
400ns
<16dB
500ns
<18dB
Hach, Lee

8. Comparing the Numbers 15.4 DSSS 15.4a CSS Difference March 2006 Trms
15.4a CSS
Difference
100ns
>22dB
<17dB
> 5 dB
200ns
<15dB
> 7 dB
300ns
>23dB
> 8 dB
400ns
>27dB
<16dB
>11 dB
500ns
>38dB
<18dB
> 20 dB
Hach, Lee

9. March 2006
Conclusion
4a CSS gives 2 dB improvment of performence over 15.4 DSSS in AWGN (250Kbps)
4a CSS gives between 5 and 20 dB improvement of performance in multipath environment
Hach, Lee

10. March 2006
Thank you!
Hach, Lee