IBM Research © 2006 IBM Corporation March 2007 Slide 1 doc.: IEEE 802.15-07/647r0 Submission...

IBM Research

© 2006 IBM Corporation

March 2007

Slide 1

doc.: IEEE 802.15-07/647r0

Submission

Alberto Valdes-Garcia, IBM Research

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

Submission Title: [Summary of link experiments and MSK-based preliminary proposal for Multi-GB/s communications at 60GHz]Date Submitted: [13 March, 2007]Source: [Troy Beukema, Brian Floyd, Brian Gaucher, Yasunao Katayama, Scott Reynolds, Alberto Valdes-Garcia] Company [IBM Research]Address [1101 Kitchawan Rd. Rte. 134, MS:30-116]Voice:[+914-945-2598], E-Mail:[[email protected]]

Re: [Request of contributions for the 802.15.3c subgroup

Abstract: [Results for 60GHz Gb/s link experiments using OFDM-QPSK, DQPSK and QFSK are summarized. An MSK-based system is proposed for usage model 5, link budget analysis and TX measurement results are included].

Purpose: [For discussion only]

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.

IBM Research


March 2007

Slide 2

doc.: IEEE 802.15-07/647r0

Submission


Outline

60GHz link experiments at IBM Research

– OFDM-QPSK

– DQPSK

– QFSK

MSK-based proposal introduction

– Concept and implementation

– Application to usage model 5

– 60GHZ MSK TX measurement results

Summary

IBM Research


March 2007

Slide 3

doc.: IEEE 802.15-07/647r0

Submission


60-GHz QPSK-OFDM Link Experiment at 630Mbps

Rx/Tx modules used with 700Ms/s ADC & software radio.

QPSK-OFDM modulation (.11a).

≤10% packet-error rate* reached at 630Mbps, 10m sensitivity.

Link budget corroborated.

Sensitivity = -68dBm at 630M.

Range at 1Gbps = 8m

PCA/D

ARB

630MbpsQPSK-OFDM

7dBi pk.gain

10m separation

Receivedconstellation

60GHz Tx Module 60GHz Rx Module

r = 20

Transmitter

Receiver

10m

*802.11a standard convention.

IBM Research


March 2007

Slide 4

doc.: IEEE 802.15-07/647r0

Submission


Link Budget for QPSK-OFDM

Parameter Value

TX power at antenna 9.5-2 = +7.5dBm

Rx/Tx antenna gain +7dBi

EIRP +14.5dBm

Path-loss exponent 2

Rx NF at antenna 6.5+2 = 8.5 dB

Modulation OFDM-QPSK

Spectral efficiency 1.1bps/Hz

Es/No 10dB

Rx impl. loss 1dB

Pwr at 1m -53.5 dBm

Sens. @ 630Mbps -73.5 dBm

Margin 20dB

Range @ 630Mbps 10^(20/20) = 10m

Range with 6dB margin 10^(14/20) = 5m

10Mb/s, 75m

100Mb/s, 25m

1Gb/s, 8m

1Gb/s, 4m

1

10

100

10M 100M 1G

Data Rate (bps)

Ran

ge (

m)

Range, 7dBiRange, 7dBi, 6dB down

Measured Range

630Mb/s, 10m

IBM Research


March 2007

Slide 5

doc.: IEEE 802.15-07/647r0

Submission


60GHz Transmitter

BlueEagle IOMXilinx FPGA:

EncoderDQPSK Modulator Neptune ADC Board:

6bit, 2GS/s ADCsXilinx FPGA: Demodulator


Video Recovery

60GHz Receiver

1-3 meters

HD Camera (1080i HD-SDI)

High-Definition Wireless Video Link (1080i) at 2 Gb/s, DQPSK

Joint experiment with Sanyo to implement 60-GHz wireless HDMI (2Gb/s) link.

Implemented link with 60-G Rx/Tx boards, external ADC, and FPGA boards.

Sanyo provided modulator and demodulator for FPGA.

IBM provided 60G radios, error correction, and video retrieval code.

IBM Research


March 2007

Slide 6

doc.: IEEE 802.15-07/647r0

Submission


ANT

frame+FEC

FMmod Tx

Tx Data

ANT

frame+FEC

Rx Data

60GHz DirectionalChannel

BandwidthLimit

FMdemodRx60GHz

Tx Data2Gb/s

Raw Rx Data

2Gb/s Detected Eye Diagram :Tx IF BW = 2GHz

FMDiscriminatorDetector

60GHz FM wireless link system

QFSK can be generated by the FPGA, driving the I/Q baseband inputs of the Tx IC

QFSK can be detected by a conventional FM detector in the Rx IC

The detected data signal can drive the FPGA directly, no ADC or digital demodulator is required.

IBM Research


March 2007

Slide 7

doc.: IEEE 802.15-07/647r0

Submission


60GHz Transmitter


EncoderQFSK Modulator

HD Camera (1080i HD-SDI)


Video Recovery

High-Definition Wireless Video Link (1080i) at 2 Gb/s, QFSK w/ FM Detection

60GHz Receiver

1-3 m

Same video encoding and Xilinx FPGA as QPSK system.

QFSK generated from FPGA code.

FM discriminator output is amplified by the Rx IC baseband VGA, which drives the rocket I/O on the FPGA directly.

An MSK link would be similar, while giving improved spectral efficiency, a constant envelope signal, and cleaner received eye diagram.

No ADC

IBM Research


March 2007

Slide 8

doc.: IEEE 802.15-07/647r0

Submission


Summary of Link Experiments

ModulationRate &

DistanceReal Time?

ADC Requirement

Demodulator

QPSK-OFDM

630 Mb/s @ 10 m

(ADC limited)

no6-b

700 MS/ssoftware

DQPSK2 Gb/s @

1-6 myes

6-b2 GS/s

FPGA

QFSK2 Gb/s @

1-3 myes

None(FM limiter-

discriminator)FPGA

All used +7 dBi gain planar folded dipole antenna on PCBs described earlier.

All used ≈ +10 dBm transmit power.

MSK link similar to QFSK; experiments are underway.

IBM Research


March 2007

Slide 9

doc.: IEEE 802.15-07/647r0

Submission


MSK System Overview

MSK attractive for high volume, low power, low cost “point-and-shoot” applications at multi-Gb/s

No ADC or high-speed digital baseband required, can make a low-power product today

We believe the standard should be defined to include both MSK and more complex modulation schemes

We are not opposed to other solutions and modulations; they will be essential for many applications. But we see MSK as an excellent choice for lowest power, reduced complexity and quick time to market

IBM Research


March 2007

Slide 10

doc.: IEEE 802.15-07/647r0

Submission


Mandatory 60-GHz Usage Model 5: Wireless Kiosk

Rate ~ 1-3 Gb/s burst data

Range ~ 1m

MSK is an excellent choice for this mandatory usage model due to its bandwidth efficiency and ease of implementation

A power outlet operated receiver (kiosk, screen) can incorporate an equalizer for improved multi-path reception if required

Movie and Game KioskMobile StorageDevice, PDA

STB, Game Console

60-GHz 60-GHz

Ref: IEEE Doc 15-06-0369-09-003c

IBM Research


March 2007

Slide 11

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Submission


Link Budget Analysis

The physical layer characteristics correspond to the measured performance of our chipset.

Data range can be further extended with higher gain antennas currently under development.

Parameter Value

PA output power [dBm] 11

antenna interconnect loss [dB] 2

Rx/Tx antenna gain [dB] 7

EIRP [dBm] 16

Path-loss exponent 2

Rx NF [dB] 6.5

Rx NF at antenna [dB] 8.5

Required Es/No 11

Rx impl. Loss [dB] 1

Path loss at 1m [dB] 68

Power at 1m after antenna [dBm] -45

Noise BW for FM detector [Hz] 2.00E+09

RX Sensitivity @ 2Gb/s [dBm] -60.5

Link Margin @ 1m 15.5

Range @ 2Gb/s [m] 5.9

Range with 6dB margin [m] 3.0

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

0.0E+00 1.0E+09 2.0E+09 3.0E+09 4.0E+09 5.0E+09 6.0E+09 7.0E+09 8.0E+09 9.0E+09

Data rate [bps]

Dis

tanc

e [m

]

IBM Research


March 2007

Slide 12

doc.: IEEE 802.15-07/647r0

Submission


60-GHz Transceiver Chipset Supporting Multiple Modulations

Technology 0.13-m SiGe

BiCMOS 5-layer metal fT 200GHz fMAX 270GHz

Freq. Plan (GHz) RF 59-64 IF 8.4-9.1 VCO 16.8-18.3

x3

PFD CP LPF

DIVSERIAL

INTERFACE

÷2

FM DISCR

AM DET

MU

XM

UX

IF AmpLNA

BBVGA

Q / (FM Data)

I / (AM Data)RF In

clk

Receiver

x3

PFD CP LPF

DIVSERIAL

INTERFACE

÷2LVLDET

MSKMOD

IF Amp

Q

IRF Out

ck

PA Driver

FSK/MSK Data

Transmitter

IBM Research


March 2007

Slide 13

doc.: IEEE 802.15-07/647r0

Submission


Rx IC

Universal I/QInterface to ADC and Demodulator

Demodulated Serial Data

Tx ICSerial Data to MSK / FSK Modulator

Universal I/QInterface for Coherent Modulation

MSK modulator is 100µm x 100µm = 0.01 mm2

Demodulator is 100µm x 200µm = 0.02 mm2

Very Low Overhead to Support MSK

Current transceiver implementation supports both an universal I/Q interface to support a variety of modulations as well as FSK/MSK modulation/demodulation capabilities.

From a radio perspective, the overhead to support MSK is negligible

IBM Research


March 2007

Slide 14

doc.: IEEE 802.15-07/647r0

Submission


Measurement results for 60GHz MSK transmitter

A transmitter with integrated MSK modulator has been tested.

60GHz 1Gb/s MSK modulated spectrum is down-converted with an external mixer for measurement with an spectrum analyzer.

At 1dB compression point the side lobe rejection degrades by only about 1dB.

MSK link measurements will follow

IBM Research


March 2007

Slide 15

doc.: IEEE 802.15-07/647r0

Submission


MSK Summary

An MSK-based system for multi-GB/s comm. at 60GHz presents significant advantages (i.e. lower complexity and power consumption) in a directional channel

FM / FSK detector has been characterized in a 2-Gb/s 60-GHz video link

Integrated MSK Transmitter has been demonstrated

Full TX and RX with MSK mod / demod have been fabricated, characterization for a high data rate link will follow

We are not opposed to other solutions and modulations; they will be essential for many applications. But we see MSK as an excellent choice for lowest power and complexity, especially for usage model 5

IBM Research © 2006 IBM Corporation March 2007 Slide 1 doc.: IEEE 802.15-07/647r0 Submission...

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