Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. 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

2. 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

3. 3 channels option relaxes spectral efficiency requirements. 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 André Bourdoux, IMEC

4. Criteria for good Air Interface • Low cost • Low power consumption • Modest FE requirements • Low channel equalization complexity André Bourdoux, IMEC

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

6. Q I Achieving required bit rates with CP-M-PSK Q Q I I QPSK O-QPSK 3/8-8PSK André Bourdoux, IMEC

7. 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

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

9. Q Q Q I I I QPSK CPM h=0.5 CPM h=0.25 Achieving required bit rates with CP-CPM André Bourdoux, IMEC

10. OFDM vs SC André Bourdoux, IMEC

11. 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