September 2006 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [PHY Layer Modulation for 802.15.3c - System Level Issues] Date Submitted: [15 September 2006] Source: [André Bourdoux, IMEC] Address [Kapeldreef 75, 3001 Leuven, Belgium] Voice:[+32-16-288215], FAX: [+32-16-281515], E-Mail:[bourdoux@imec.be] Re: [TG3c technical requirements] Abstract: [] Purpose: [Discussion of TG3c Modulation for System Requirements.] Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. André Bourdoux, IMEC

Introduction TG3c System Requirements (15-05-0353-07): September 2006 Introduction TG3c System Requirements (15-05-0353-07): 2 Gbps (mandatory) and 3 Gbps (optional) 4 channels in 7 GHz bandwidth Impact on spectral efficiency, modulation ? Link with front-end requirements ? André Bourdoux, IMEC

PHY Layer Requirements September 2006 PHY Layer Requirements Data rate: 2 Gbps mandatory 3 Gbps optional Physical bandwidth: 4 channels in 7 GHz: 7/4 = 1.75 GHz  ~1.5 GHz ? 3 channels in 7 GHz: 7/3 = 2.33 GHz  ~2.0 GHz ? Spectral efficiency (uncoded): 2 Gbps 2 x (4/3) / 1.5 = 1.78 b/s/Hz 2 x (4/3) / 2.0 = 1.33 b/s/Hz 3 Gbps 3 x (4/3) / 1.5 = 2.66 b/s/Hz 3 x (4/3) / 2.0 = 2.00 b/s/Hz 3 channels option relaxes spectral efficiency requirements. André Bourdoux, IMEC

Criteria for good Air Interface September 2006 Criteria for good Air Interface Low cost Low power consumption Modest FE requirements Low channel equalization complexity André Bourdoux, IMEC

Add CP for freq. domain equalizer September 2006 System level approach Battery-powered PA is key consumer Avoid OFDM Simplify filtering Low spectral regrowth Avoid M-QAM LOS Possible Simplify equalization Add CP for freq. domain equalizer PSK-based: CP-OQPSK, CP-3/8-shifted 8PSK CPM-based: CP-CPM (many flavours) André Bourdoux, IMEC

Achieving required bit rates with CP-M-PSK September 2006 Achieving required bit rates with CP-M-PSK Q Q I Q I I QPSK O-QPSK 3/8-8PSK 2 Gbps 3 Gbps 1.75 GHz 1.78 b/s/Hz CP-OQPSK 2.66 b/s/Hz CP-3/8-8PSK 2.33 GHz 1.33 b/s/Hz 2.00 b/s/Hz André Bourdoux, IMEC

CPM parameters reminder September 2006 CPM parameters reminder log2M bits/symbol Pulse shape and length (rect, raised cos, gaussian, …) [Anderson, “Digital Phase Modulation”, 1986, Springer (Plenum Press)] André Bourdoux, IMEC

Achieving spectral efficiency with CPM September 2006 Achieving spectral efficiency with CPM 3COS,M=4,h=0.25 Good spectral performance 3COS,M=2,h=0.5 Low complexity 3COS,M=4,h=0.5 Good error performance André Bourdoux, IMEC

Achieving required bit rates with CP-CPM September 2006 Achieving required bit rates with CP-CPM I Q QPSK Q I Q CPM h=0.25 I CPM h=0.5 1 Gbps 2 Gbps 3 Gbps 1.75 GHz 0.89 b/s/Hz 3COS, M=2, h=0.5 1.78 b/s/Hz 3COS, M=4, h=0.25 2.66 b/s/Hz ?? 2.33 GHz 0.67 b/s/Hz 1.33 b/s/Hz 2.00 b/s/Hz André Bourdoux, IMEC

September 2006 OFDM vs SC André Bourdoux, IMEC

Conclusion for 60 GHz PHY layer September 2006 Conclusion for 60 GHz PHY layer For cost, power consumption and complexity: O-QPSK or CPM are good, front-end friendly candidates Cyclic prefix combined with single carrier modulation allows simple and optional frequency domain equalization Channelization with 3 channels allows modulation with  2 bits/symbol André Bourdoux, IMEC