March, 2003 IEEE P /131r0. IEEE P Wireless Personal Area Networks
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1 Project Title IEEE P Wireless Personal rea Networks IEEE P Working Group for Wireless Personal rea Networks (WPNs) PHY Proposal Using Dual Independent Single Sideband, Non-coherent M and Defined Unit Pulse Date Submit March 3, 2003 Source Re: Chandos. Rypinski 130 Stewart Drive Tiburon, C a CFP Response presentation Voice: [ ] [chanryp@sbcglobal.net] bstract Purpose Notice Release 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). 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. This document has been prepared to assist the IEEE P 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. The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P Submission Slide 1 Chandos. Rypinski
2 Proposal SSB and DSB M Modulation for High-rate Microwave Radio Systems bout 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. better means of data encoding is amplitude modulation using a detection means that is independent of RF phase. For better spectral efficiency with M, it is desirable to use single sideband transmission with a small number of amplitude coding levels. Submission Slide 2 Chandos. Rypinski
3 Technology Proposed There are two primary technology selections: Use of three-level sym-pulse baseband data shaping (later described), and Use of M 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 one 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 operating principal is based on the identity: cos 2 θ + sin 2 θ = 1 with a pair of quadrature phased mixers. Submission Slide 3 Chandos. Rypinski
4 Frequency conversion plan t 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 output at MHz from the microwave mixer LO frequency. T3 OUTPUT GHz GHz GHz T2 0 MHz T1 50 MHz Upper sideband channel INPUT 25 MHz 25 MHz 50 MHz 0 MHz Lower sideband channel 25 MHz 25 MHz 0 MHz 0 MHz Figure -1 Frequency relationship diagram for transmit conversion steps Submission Slide 4 Chandos. Rypinski
5 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%) ll 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-QM/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 Waveform Submission Slide 5 Chandos. Rypinski
6 2 Figure 1 stream and associated 3-level analog waveform d Shown below is a simulation binary data pattern and the resulting video waveform. t sampling time, the amplitude is either +1 or 1 for data 1 or approximately zero (several db) lower for data zero. d Submission Slide 6 Chandos. Rypinski
7 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 of 4095 pseudo-random bits. The normal null at the bit rate also appears at 25 MHz. The out-of-band level is more than 40 db down. Submission Slide 7 Chandos. Rypinski
8 Recommendations to 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 of implementation and quality of provided communication. Submission Slide 8 Chandos. Rypinski
9 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. cknowledgments This work is the result of the combined efforts of Bob Ritter (partner), John rminini and the uthor. ll had an indispensable and highly valuable part in this work. Submission Slide 9 Chandos. Rypinski
10 5.25 GHz dual ISSB M data radio transmitter block diagram 5.25 GHz Signal Frequency Video Baseband Video baseband data processing 5.25 GHz Signal Frequency ntenna ports 90 Video data 2-23 MHz 2 90 degree 4/4 Hybrid waveform & clock pulse Video generator Stream bit clock in preamble memory PROM FIFO in and FIFO out incoming data buffer 5 GHz Synthesizer 800 MHz Synthesizer GHz / MHz for 400 MHz Receive LO 10 MHz master frequency reference 50 MHz for 25 MHz Xmt LO waveform & clock pulse Video generator Stream bit clock in odd-even data splitter preamble memory PROM FIFO in and FIFO out incoming data buffer in Figure GHz dual ISSB M data radio transmitter block diagram (60 Mbps in 48 MHz bandwidth) Submission Slide 10 Chandos. Rypinski
11 5.25 GHz dual ISSB M radio receiver block diagram 5.25 GHz Signal Frequency Video Baseband MHz IF (DSB) amplifiers Video baseband data processing 5.25 GHz Signal Frequency ntenna ports 90 Video data 2-23 MHz 2 90 degree 4/4 Hybrid MHz Bessel + - 2X LO in utomatic Gain Control Reference threshold out Math function analog processor C bit clock generator synchronized strobe in data conditioner odd-even data combiner clock out GHz 5 GHz Synthesizer 800 MHz Synthesizer 800 MHz for 400 MHz Receive LO 10 MHz master frequency reference utomatic Gain Control 2X LO in Reference threshold out Math function analog processor C bit clock generator synchronized strobe in data conditioner Figure GHz dual ISSB M radio receiver block diagram Submission Slide 11 Chandos. Rypinski
12 Implementation of a DSBSC Radio The is a very simple radio and data detection will provide Mbps in MHz or any other rate at linearly scaled bandwidth GHz Signal Frequency MHz IF (DSB) amplifiers Video baseband data processing antenna 5 GHz Synthesizer Video data 2-23 MHz GHz MHz T out T GC R T T utomatic Gain Control /2 + 2X LO in Video Stream Reference threshold Math function analog processor waveform & clock pulse generator out C bit clock in bit clock generator synchronized strobe in data conditioner FIFO in and FIFO out clock out preamble memory PROM incoming data buffer 800 MHz Synthesizer 10 MHz master frequency reference Figure B-1 M DSBSC Radio Modem Transceiver Block Diagram Submission Slide 12 Chandos. Rypinski
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