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19:23:39 +0100 Received: from mtaomg-aac02.mx.aol.com (mtaomg-aac02.mx.aol.com [172.27.2.36]) by omr-m03.mx.aol.com (Outbound Mail Relay) with ESMTP id 53D0670036208 for ; Sat, 23 May 2015 14:23:32 -0400 (EDT) Received: from core-afa02f.mail.aol.com (core-afa02.mail.aol.com [172.27.24.2]) by mtaomg-aac02.mx.aol.com (OMAG/Core Interface) with ESMTP id E7A7938000084 for ; Sat, 23 May 2015 14:23:31 -0400 (EDT) References: To: rsgb_lf_group@blacksheep.org In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: Markus Vester X-MB-Message-Type: User X-Mailer: AOL Webmail BASIC Received: from 178.27.238.74 by webmail-vm180.sysops.aol.com (149.174.158.118) with HTTP (WebMailUI); Sat, 23 May 2015 14:23:31 -0400 Message-Id: <8D2639CB5174D36-131C-D898@webmail-vm180.sysops.aol.com> X-Originating-IP: [178.27.238.74] Date: Sat, 23 May 2015 14:23:31 -0400 x-aol-global-disposition: G X-AOL-VSS-INFO: 5700.7163/104093 X-AOL-VSS-CODE: clean DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20140625; t=1432405412; bh=YFY0/CpgfJPQqM135f/Wq72D3yy3+0gO9XW4jNMdhJw=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=Xj3MBxi0/CM6t0zH1cn2W9TXOAwEfT0L57f2RNThbFGPCrFOSlc0Vjr+Hp4pT+Ew4 JbzdN7O5zVgksiTGTzX7CrEG50covmNAx/Q4nXpoEYMjon0vyjtz4MwTt0IVGSlq2g p6/rhFRPgL/FEaocUkXCkODPqSernKqI30Dx+FWs= x-aol-sid: 3039ac1b02245560c5a330b4 X-Scan-Signature: bb953ecadee360a40f72202c1637b86b Subject: LF: False Decode or Real? - Opera vs opds Content-Type: multipart/mixed; boundary="--------MB_8D2639CB52CB9A8_131C_1A5A0_webmail-vm180.sysops.aol.com" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3224 This is a multi-part message in MIME format. ----------MB_8D2639CB52CB9A8_131C_1A5A0_webmail-vm180.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8"; format=flowed Hi=20Graham,=0D=0A=0D=0A>=20OPDS=20makes=20use=20of=20=20Wolfs=20=20=20some=20wh= at=20excellent=20spectrum=20=20software=20as=20=0D=0ADSP=0D=0A=0D=0ASpectrum=20L= ab=20is=20used=20as=20the=20frontend=20for=20opds,=20the=20only=20signal=20=0D=0A= processing=20done=20there=20is=20a=20straight=20high-resolution=20FFT=20before=20= =0D=0Aexporting=20the=20data.=20Opds=20then=20searches=20for=20spectral=20peaks,= =20and=20=0D=0Atransforms=20a=201024=20bin=20channel=20around=20each=20peak=20ba= ck=20to=20time=20domain=20(0.5=20=0D=0AHz=20wide,=204x=20oversampled).=20For=20c= oherent=20signals,=20the=20central=20carrier=20is=20=0D=0Aextracted=20(including= =20possible=20drift=20and=20fading),=20and=20synchroneous=20=0D=0Ademodulation=20= is=20performed.=20Then=20the=20resulting=20real=20waveform=20is=20Fourier=20=0D=0A= transformed=20again=20for=20a=20CPU-efficient=20crosscorrelation=20to=20each=20o= f=20the=20=0D=0Acallsign=20templates.=0D=0A=0D=0A>=20both=20=20systems=20=20reli= ably=20=20produce=20=20=20false=20detections=20=20when=20=20subjected=20=0D=0Ato= =20=20noise=20..=0D=0A=0D=0AOpds-32=20has=20been=20running=20on=20LF=20continuou= sly,=20typically=20analyzing=20about=20=0D=0A20=20QRM=20peaks=20every=2010=20min= utes=20in=20a=20115=20Hz=20wide=20band.=20The=20searchlist=20has=20=0D=0Acurrent= ly=20around=2050=20entries.=20With=20a=20correlation=20threshold=20of=2015=20dB,= =2028=20=0D=0Afalse=20detections=20have=20occured=20in=2020=20weeks=20since=20ye= ar=202015:=0D=0A=20https://dl.dropboxusercontent.com/u/26404526/opds32.txt=0D=0A= In=20a=20pdf=20file=20distributed=20with=20Opera=201.5.7=20software,=20the=20aut= hor=20EA5HVK=20=0D=0Amentions=20that=20he=20tested=20opds=20and=20got=2011=20fal= se=20detections=20in=20only=204=20=0D=0Ahours=20-=20an=20observation=20which=20i= s=20obviously=20not=20corroberated=20by=20my=20=0D=0Astatistics.=0D=0A=0D=0A>=20= hence=20=20ultra=20stable=20=20TX=20and=20=20RX=20can=20give=20=20advantage=0D=0A= =0D=0ABy=20using=20synchroneous=20demodulation=20rather=20than=20power=20detecti= on,=20opds=20=0D=0Acan=20detect=20coherent=20and=20stable=20signals=20that=20abo= ut=204=20dB=20weaker.=20Attached=20=0D=0Aare=20two=20plots,=20showing=20a=20side= -by-side=20comparison=20of=20detection=20=0D=0Aprobability=20and=20SNR=20output=20= from=20the=20Opera=201.5.6=20decoder=20and=20the=20=0D=0Aopds2h5c=20detector.=0D= =0A=0D=0ASpecLab's=20digimode=20terminal=20was=20used=20to=20generated=20coheren= t=20and=20=0D=0Aperfectly=20timed=20Opera=20signals,=20and=20white=20noise=20fro= m=20the=20test=20signal=20=0D=0Agenerator=20was=20added=20with=20variable=20powe= r=20density=20(dB/Hz).=20The=20very=20same=20=0D=0Aoutput=20was=20analyzed=20wih= in=20SpecLab=20to=20feed=20opds,=20and=20played=20to=20the=20Opera=20=0D=0Asoftw= are=20usingh=20VAC.=20To=20speed=20up=20the=20experiments,=20all=20testing=20was= =20done=20=0D=0Aat=20Op-05=20speed=20(30=20seconds),=20and=20SNR=20values=20were= =20then=20scaled=20down=20by=2024=20=0D=0AdB=20to=20Opera-32.=20During=20the=20t= est,=20no=20false=20detections=20were=20observed=20in=20=0D=0Athe=20output=20fro= m=20either=20program.=0D=0A=0D=0AIn=20the=20attached=20splot=20uccessrate.png,=20= the=20solid=20lines=20with=20squares=20show=20=0D=0Adetection=20probability=20(0= =20to=20100%)=20against=20average=20SNR=20in=202.5=20kHz.=20The=20=0D=0Aclassic=20= Opera=20decoder=20(red)=20achieved=2050=20%=20detections=20at=20-40=20dB.=20Opds= =20=0D=0Acorrelation=20(blue)=20goes=20down=20to=20-49=20dB,=20showing=20a=204=20= dB=20advantage=20for=20=0D=0Athese=20ideal=20signals.=20The=20blue=20crosses=20i= ndicate=20correlation=20dB=20output=20=0D=0A=20from=20opds=20-=20note=20that=20o= nly=20hits=20above=20the=20standard=2015=20dB=20threshold=20=0D=0A(dashed=20line= 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