March, 2003 IEEE P802.15-03/131r0 IEEE P802.15 Wireless Personal - - PowerPoint PPT Presentation

March, 2003 IEEE P802.15-03/131r0

Submission Slide 1 Chandos A. Rypinski

IEEE P802.15 Wireless Personal Area Networks

Project IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Title PHY Proposal Using Dual Independent Single Sideband, Non-coherent AM and Defined Unit Pulse Date Submit March 3, 2003 Source Chandos A. Rypinski 130 Stewart Drive Tiburon, CA 94920 Voice: [ 415-435-0642 ] E-mail: [chanryp@sbcglobal.net] Re: 15.3a CFP Response presentation Abstract This proposal is a combination of: 1) a baseband waveform with desirable properties for a bandpass medium, and 2) where the unit pulse period is several bit durations and overlapped to double the information transfer rate by creating three amplitude levels, and 3) linear translation of the data bearing waveform to a single radio sideband, and 4) two instances of that translation such that the homodyne image of one sideband falls inverted in the passband of the other. This contribution contains: a) mathematical simulations of the baseband data waveform properties, and b) implementation description in support of asserted execution simplicity, and c) results available from recent work on system simulation (continuing).

Purpose To show evidence of advantage of analog-intensive approach to high speed data transmission with particular emphasis on optimization criteria and definition of propagation environment. 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.

March, 2003 IEEE P802.15-03/131r0

Submission Slide 2 Chandos A. Rypinski

Proposal–SSB and DSB AM Modulation for High-rate Data Microwave Radio Systems

About Modulation and Microwave Propagation Multipath propagation substantially degrades the orthogonality of the I and Q phases increasing crosstalk interference as the points in the constellation are increased. The phase of a vector sum of several rays is a constantly changing value which makes difficult receivers which can successfully decode data. A better means of data encoding is amplitude modulation using a detection means that is independent of RF phase. For better spectral efficiency with AM, it is desirable to use single sideband transmission with a small number of amplitude coding levels.

March, 2003 IEEE P802.15-03/131r0

Submission Slide 3 Chandos A. Rypinski

Technology Proposed There are two primary technology selections:

Use of three-level sym-pulse baseband data shaping (later described), and Use of AM with ISSB SC (independent dual single sideband—suppressed carrier) radio

modulation The SSB signal consists of two independent data streams about a virtual carrier, and provides twice the bits/ Hz as the DSB. The SSB is arranged so that the suppressed image of

• ne data channel is in the passband of the other. The phasing cancellation employed

provides at least 23 dB suppression of the image relative to the desired signal. The method employed uses two (vector) I-Q mixers, and two narrow band phase shifters. The receiver uses phase-independent amplitude detection for both SSB and DSB. The

• perating principal is based on the identity: cos2θ + sin2θ = 1 with a pair of quadrature

phased mixers.

March, 2003 IEEE P802.15-03/131r0

Submission Slide 4 Chandos A. Rypinski

Frequency conversion plan At the input a video signal with a power spectrum symbolized by a trapezoid (T1) is applied to a video mixer with a 25 MHz LO for a 2 x 30 Mbps data transport. The output of this mixer, shown in mid-figure (T2), is double sideband replica extending from 2-48 MHz. The lower sideband is desired, and the upper sideband is to be stopped by the 25 MHz low pass filters preceding the microwave

• mixer. Failure of this stop function

causes an undesired product (shown dotted) to appear at the 5 GHz

• utput at 25-50 MHz from the

microwave mixer LO frequency.

Figure A-1 Frequency relationship diagram for transmit conversion steps

HI HI HI HI HI HI HI HI 0 MHz 25 MHz 50 MHz 0 MHz 25 MHz 50 MHz 0 MHz 0 MHz 25 MHz 25 MHz 5.225 GHz 5.250 GHz 5.200 GHz T1 T2 T3

Upper sideband channel Lower sideband channel

INPUT OUTPUT

March, 2003 IEEE P802.15-03/131r0

Submission Slide 5 Chandos A. Rypinski

Properties of the Video Waveform The advantages of the sym-pulse three-level random data stream is the combination of the following characteristics:

First null near 80 % of the bit rate (rather than 100%) All sidelobes beyond the first null are more an 30 dB down—worst case Low energy content at frequencies below 10% of the first null frequency SSB spectral utilization of more than 1.3 bits/

Hz Because there are only three amplitude levels and no crosstalk from a quadrature phase, this modulation will be more robust than 4-QAM/ QPSK and much more robust than higher order constellation modulations. This is a baseband data waveform which has the following properties: a) an acceptable relationship between bit rate-carried and occupied bandwidth, and b) sufficient suppression of side-lobes so that additional filtering is not required. The Baseband Data Waveform

March, 2003 IEEE P802.15-03/131r0

Submission Slide 6 Chandos A. Rypinski

Figure 1 Data stream and associated 3-level analog waveform

Shown below is a simulation binary data pattern and the resulting video waveform. At sampling time, the amplitude is either +1 or –1 for data 1 or approximately zero (several dB) lower for data zero.

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 2 2 d 12 − 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 20 10 10 20 d

March, 2003 IEEE P802.15-03/131r0

Submission Slide 7 Chandos A. Rypinski

Data Waveform Power Spectral Density

Figure 3 Calculated and smoothed spectrum for waveform of previous Fig. 1

This is the power density spectrum at baseband (video) that results from this signal. The first null is at 20.5 MHz at a 25 Mbps data rate. The transform is performed for a sequence

• f 4095 pseudo-random bits. The normal null at the bit rate also appears at 25 MHz. The
• ut-of-band level is more than 40 dB down.

5 10 15 20 25 30 35 40 45 50 80 60 40 20

March, 2003 IEEE P802.15-03/131r0

Submission Slide 8 Chandos A. Rypinski

Recommendations to 802.15.3

Recognize as a class modulations that have the following properties a) use a single virtual or actual radio frequency carrier, and b) use amplitude coding to carry data information, and c) use radio frequency phase-independent means of detecting the data carried, and d) use a small number of levels for information coding, and e) achieve the desired rate within a bandwidth of one set of regulatory constraints For modulations of this class use a virtual or physical interface between video data waveform bearing information and the radio translation from baseband. This class is believed to offer the superior prospects for a combination of simplicity

• f implementation and quality of provided communication.

March, 2003 IEEE P802.15-03/131r0

Submission Slide 9 Chandos A. Rypinski

Need for Collaboration In 802, a one-person or one-Company proposal rarely gets as far as the short list of

• candidates. Provided that this work is seen as sufficiently attractive for possible adoption

in whole or in part, this Contributor (and partner) would like to see this technology absorbed within the effort of a stronger sponsorship. Acknowledgments This work is the result of the combined efforts of Bob Ritter (partner), John Arminini and the Author. All had an indispensable and highly valuable part in this work.

March, 2003 IEEE P802.15-03/131r0

Submission Slide 10 Chandos A. Rypinski

5.25 GHz dual ISSB AM data radio transmitter block diagram

Figure A-2 5.25 GHz dual ISSB AM data radio transmitter block diagram (60 Mbps in 48 MHz bandwidth)

bit clock incoming data buffer FIFO in and FIFO out preamble memory

PROM

waveform & clock pulse generator 10 MHz master frequency reference

A BPF

5.25 GHz Signal Frequency

Data in Video Data Stream

BSL LPF BSL LPF

5.15-5.35 GHz 5 GHz Synthesizer

A BPF

800 MHz Synthesizer

Video baseband data processing

bit clock Data in incoming data buffer FIFO in and FIFO out preamble memory

PROM

waveform & clock pulse generator

Data in Video Data Stream

BSL LPF BSL LPF

90 degree 4/4 Hybrid

LPF2

5.25 GHz Signal Frequency A BPF

90

LPF2

Video data 2-23 MHz Antenna ports A BPF

• dd-even

data splitter 800 MHz for 400 MHz Receive LO /16 50 MHz for 25 MHz Xmt LO

Video Baseband + +

March, 2003 IEEE P802.15-03/131r0

Submission Slide 11 Chandos A. Rypinski

5.25 GHz dual ISSB AM radio receiver block diagram

Figure A-3 5.25 GHz dual ISSB AM radio receiver block diagram

Data

• ut

bit clock generator synchronized

strobe in Data clock

376-424 MHz IF (DSB) amplifiers

10 MHz master frequency reference

A BPF

5.25 GHz Signal Frequency

BSL LPF BSL LPF

5.15-5.35 GHz Math function analog processor Data

• ut

C LPF A Automatic Gain Control Reference threshold 5 GHz Synthesizer

A BPF

800 MHz Synthesizer

Video baseband data processing

2X LO in data conditioner

bit clock generator synchronized

strobe in

BSL LPF BSL LPF

Math function analog processor Data

• ut

C LPF A Automatic Gain Control Reference threshold 2X LO in 90 degree 4/4 Hybrid

LPF2

5.25 GHz Signal Frequency A BPF

90

LPF2

Video data 2-23 MHz Antenna ports A BPF

• dd-even

data combiner data conditioner 800 MHz for 400 MHz Receive LO BPF BPF 376-424 MHz BPF Bessel

Video Baseband +

March, 2003 IEEE P802.15-03/131r0

Submission Slide 12 Chandos A. Rypinski

Implementation of a DSBSC Data Radio The is a very simple radio and data detection will provide 30-32 Mbps in 24-25 MHz or any

• ther rate at linearly scaled bandwidth.

Figure B-1 AM DSBSC Radio Modem Transceiver Block Diagram

Data

• ut

bit clock generator synchronized

strobe in

Data clock bit clock

376-424 MHz IF (DSB) amplifiers

incoming data buffer FIFO in and FIFO out preamble memory

PROM

waveform & clock pulse generator 10 MHz master frequency reference

A BPF

5.25 GHz Signal Frequency

Data in Video Data Stream

+ /2

BSL LPF BSL LPF BSL LPF BSL LPF

4.75-4.95 GHz

377- 423 MHz R T T

Math function analog processor Data

• ut

C

LPF

A Automatic Gain Control

Reference threshold

5 GHz Synthesizer

A BPF

800 MHz Synthesizer

Video baseband data processing

T AGC T out 2X LO in

LPF2

A BPF Video data 2-23 MHz A BPF data conditioner BPF antenna