1. May. 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [ Adopting Flexible DSSS Modulation for PHY Layer]
Date Submitted: [30 April, 2009]
Source: [Yaoxian Fu, Jie Shen, Tao Xing, Haitao Liu, Liang Li, Liang Zhang, Zhuang Zhao] Company [SIMIT, Vinno, JiaXing Wireless Sensor Networks Engineering Center, Huawei]
Address [NO.865 Changning Road, Shanghai, , China]
Voice:[ ], FAX:[ ], [ ]
Re: [IEEE g group]
Abstract: Expand the flexiblity of current physical layer, and add measure of adapting to the most suitable modulation method with efficiency
Purpose: Presented to the g SUN Task Group for consideration
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
FX. Fu, J.Shen

2. May. 2009
Motivation
Achieve the optimal energy efficient link considering the possible scene of coexistence with other systems in the same band(s)
Less complexity, less control cost in the typical application scene
Compatible with the IEEE serial Std
FX. Fu, J.Shen

3. Flexible DSSS Modulation on Physical Layer
May. 2009
Flexible DSSS Modulation on Physical Layer
Suggest: one Flexible DSSS, adjustable spreading gain ranging from 0dB(min) to 30dB(max).
Benefits:
M-ary spread spectrum can save the spectrum efficiency if needed
Varying spread gain can adapt to different situation
There is no need to change signal spectum width when data rate changes, and the channel schedule is easy to plan
Anti-multipath fading and less interference to narrow band system
Compatable with current physical layer
FX. Fu, J.Shen

4. Flexible Frame Head and Payload Using Different PN Code
May. 2009
Flexible Frame Head and Payload Using Different PN Code
The frame head uses the conventional PN code.
The PN code used in frame head is suggested to be the same, in most cases, the larger spreading gain is used.
The frame head carries the information of the PN code index of the following data, so that the send part can choose and decide the spreading method of the payload, without additional negotiation
The payload can use the most suitable PN code, which is adjustable according to the scenario
The receive part listens to the frame head firstly, and according to the index carried in the frame head, adjust to the required dedespreading method to receive and can measure the signal energy through the catch frame length
FX. Fu, J.Shen

5. The Detail will be submitted in the later version
May. 2009
Conclusion
These tech proposals are tested in lab and achieve the interesting results.
The Detail will be submitted in the later version
Will to cooperate to other companies on Flexible DSSS Modulation for 4G PHY layer.
FX. Fu, J.Shen