7 May 2007 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [PHY Layer Submission for 802.15.3c] Date Submitted: [7 May 2007] Source: [André Bourdoux, Stefaan Derore, Jimmy Nsenga, Wim Van Thillo - 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: [Proposed PHY layer for IEEE802.15.3c 60 GHz WPANs] 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

7 May 2007 Introduction Proposal for the PHY layer of IEEE802.15.3c in response to CFP 07/586r2. Targets the high data rates Requirements of TG3c (15-05-0353-07) Up to 3 Gbps including overheads 3 channels channelization Suitable for integration in full CMOS Carefull analysis to reduce of 60 GHz front-end impact André Bourdoux, IMEC

Criteria for good Air Interface 7 May 2007 Criteria for good Air Interface Low cost Low power consumption Modest FE requirements Low channel equalization complexity André Bourdoux, IMEC

What is not in this presentation/proposal ? 7 May 2007 What is not in this presentation/proposal ? MAC impact or modifications Preamble/pilot design Specific mapping and/or coding scheme (e.g. unequal error protection) for the support of video We concentrate on the careful selection of the modulation/equalization scheme towards low cost, low power consumption and easy system-on-a-chip implementation André Bourdoux, IMEC

Air interface selection 7 May 2007 Air interface selection Battery-powered terminal Power amplifier and DAC/ADC are critical power consumer LOS or NLOS, directional or omni-directional antennas Low-to-high multipath propagation (Quasi-)constant envelope modulations Optional CP for frequency domain equalization PSK-based: CP-M-PSK CPM-based: CP-GMSK André Bourdoux, IMEC

LOS - option 1 Receiver “decides” LOS - option 2 Transmitter “decides” 7 May 2007 OFDM / SC-FDE / SC Transmitter Receiver OFDM IFFT CPI Channel CPR FFT FDE Detector NLOS CPI Channel CPR FFT FDE IFFT Detector LOS - option 1 Receiver “decides” SC solution CPI Channel CPR Single-tap equalizer Detector LOS - option 2 Transmitter “decides” Channel Single-tap equalizer Detector CPI: Cyclic Prefix Insertion CPR: Cyclic Prefix Removal SC: Single-carrier FDE: Frequency Domain Equalizer André Bourdoux, IMEC

Cyclic prefix addition 7 May 2007 Cyclic prefix addition Complexity is negligible Requires buffering of small part of the payload data CP length is programmable (0, 1/32, 1/16, 1/8 and 1/4) For CP-M-PSK: Payload data N-1 CP N Payload data N CP N+1 Payload data N+1 For CP-GMSK: Payload data N-1 CP N Payload data N CP N+1 Payload data N+1 Midamble (4 bits) André Bourdoux, IMEC

M-PSK and CP-M-PSK Transmitter 7 May 2007 M-PSK and CP-M-PSK Transmitter Coding & Mapping 2 Pulse shaping filter DAC Add CP André Bourdoux, IMEC

M-PSK and CP-M-PSK Receiver 7 May 2007 M-PSK and CP-M-PSK Receiver Single-tap time-domain equalizer Digital filter 2 Demapping & Decoding ADC Remove CP Freq-domain equalizer (FFT + equal. + IFFT) André Bourdoux, IMEC

GMSK and CP-GMSK Transmitter 7 May 2007 GMSK and CP-GMSK Transmitter Coding & Mapping 2 Pulse shaping filter Phase Accum. Look-up table. DAC Add CP and midamble 2πh FM modulator André Bourdoux, IMEC

GMSK and CP-GMSK Receiver 7 May 2007 GMSK and CP-GMSK Receiver Matched filter Threshold detector Demapping & Decoding ADC Remove CP FFT (size 2N) Equal. (size 2N) Filterbank IFFT (size N) Metric calculation Viterbi Midamble deletion André Bourdoux, IMEC

System parameters (1) CP-M-PSK Block length: 512 symbols 7 May 2007 System parameters (1) CP-M-PSK Block length: 512 symbols CP length: 0, 16, 32, 64, 128 symbols Maximum symbol rate: 1.667 Gsymb/s TX filter roll-off: 0.2  BW = 2 GHz Carrier spacing: (1+15%)BW = 2.3 GHz Bit rate (CP=25%, CR=3/4): BPSK: 1 Gbps QPSK: 2 Gbps 8-PSK: 3 Gbps André Bourdoux, IMEC

System parameters (2) CP-GMSK Block length: 512 symbols 7 May 2007 System parameters (2) CP-GMSK Block length: 512 symbols CP length: 0, 16, 32, 64, 128 symbols Maximum symbol rate: 1.667 Gsymb/s CPM pulse shape: Gaussian, length 3 Carrier spacing: (1+15%)BW = 2.3 GHz Bit rate (CP=25%, CR=3/4): 1 Gbps André Bourdoux, IMEC

Coded bit rate @ highest sample rate (3.333 Gsamples/s) 7 May 2007 System parameters (3) Coded bit rate @ highest sample rate (3.333 Gsamples/s) André Bourdoux, IMEC

7 May 2007 PSD of M-PSK without André Bourdoux, IMEC

7 May 2007 PSD of M-PSK with PA André Bourdoux, IMEC

7 May 2007 PSD of GMSK André Bourdoux, IMEC

Modeled non-idealities 7 May 2007 Modeled non-idealities PA: modified Rapp model AM-AM: p = 1.1, G = 16 (12 dB) AM-PM: q = 4.5, A = -885, B = 0.1665 ADC: Resolution: 5 bits ENOB for M-PSK 4 bits ENOB for GMSK Clipping level: 2xVrms Phase noise: -87 dBc/Hz - 20 dB/dec from 1 MHz -140 dBc/Hz floor -87 dBc/Hz -140 dBc/Hz -20 dB/decade PSD (dBc/Hz) 1 MHz Δf (Hz) André Bourdoux, IMEC

Uncoded BER Performances 7 May 2007 Uncoded BER Performances Ideal case CM13 – Single-tap time-domain equalizer (quasi LOS) CM13 – Frequency-domain equalizer CM23 – Frequency-domain equalizer CM31 – Frequency-domain equalizer Combined non-idealities PA + ADC + Phase noise (with tracking) André Bourdoux, IMEC

7 May 2007 Ideal case André Bourdoux, IMEC

Non-ideal case (PA, ADC and PN) 7 May 2007 Non-ideal case (PA, ADC and PN) André Bourdoux, IMEC

GMSK and CP-GMSK Sensitivity to non-idealities 7 May 2007 GMSK and CP-GMSK Sensitivity to non-idealities André Bourdoux, IMEC

BPSK and CP-BPSK Sensitivity to non-idealities 7 May 2007 BPSK and CP-BPSK Sensitivity to non-idealities André Bourdoux, IMEC

QPSK and CP-QPSK Sensitivity to non-idealities 7 May 2007 QPSK and CP-QPSK Sensitivity to non-idealities André Bourdoux, IMEC

8-PSK and CP-8-PSK Sensitivity to non-idealities 7 May 2007 8-PSK and CP-8-PSK Sensitivity to non-idealities André Bourdoux, IMEC

7 May 2007 Manufacturability André Bourdoux, IMEC

7 May 2007 Zero-IF Transceiver André Bourdoux, IMEC

Analog Transceiver power consumption 7 May 2007 Analog Transceiver power consumption 45 nm CMOS process (except PA) André Bourdoux, IMEC

Digital Receivers power consumption 7 May 2007 Digital Receivers power consumption 45 nm CMOS process (except PA) André Bourdoux, IMEC

7 May 2007 Conclusion Single carrier can cope with LOS and non-LOS channels easily Avoids PAPR problem of OFDM low cost, low power ADC and PA Easily upgradable to higher constellations Two classes of devices possible: For LOS scenarios (simple receiver) For NLOS scenarios (frequency domain equalizer) Easy manufacturability in cheap 45 nm CMOS processes André Bourdoux, IMEC

7 May 2007 Back-up Slides André Bourdoux, IMEC

CPM parameters reminder 7 May 2007 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 7 May 2007 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

7 May 2007 OFDM vs SC André Bourdoux, IMEC