Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAOM6moi021152 for ; Tue, 24 Nov 2015 23:06:48 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a1Lgs-0007AD-M2 for rs_out_1@blacksheep.org; Tue, 24 Nov 2015 22:03:58 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a1Lgs-0007A2-Dt for rsgb_lf_group@blacksheep.org; Tue, 24 Nov 2015 22:03:58 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a1Lfs-00024A-6V for rsgb_lf_group@blacksheep.org; Tue, 24 Nov 2015 22:03:57 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 0ECF63273F4 for ; Tue, 24 Nov 2015 21:53:53 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 3E47528A0121 for ; Tue, 24 Nov 2015 22:02:40 +0000 (UTC) Message-ID: <5654DE7F.5020404@abelian.org> Date: Tue, 24 Nov 2015 22:02:39 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D2F514A9F21A20-1830-146D0@webmail-vd014.sysops.aol.com> In-Reply-To: X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Re: LF: EbNaut and The Cat / Take 3 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: 5302 Domenico wrote: > a little signal, but decoded also here Excellent result. That's the sort of test I like to see, where Eb/N0 = 0.7 dB and the program will have had to search for the phase and it had to use some list decoding. That's a proper weak signal test. I guess it should stand another dB weaker. The 21:30 just decoded here with Eb/N0 = -0.6 dB and the phase pattern was -30 -60 -30 -60, might be propagation or my timing system having a hiatus. The symbol timing of the 21:00 looked good. I tried some time shifts both ways and it didn't improve. Markus wrote: > It seems that non-existing symbols with null > amplitude are not being counted as symbol > errors, which severely biases the error rate. Yes it looks like you're right, the zero symbols are not counting as errors. They contribute neither positive or negative to the accumulated log-likelihood of the path metric. It's effectively an erasure code. I'll alter the BER arithmetic tomorrow, it probably should consider only the non-zero symbols. Might need some thought. Have to go out now but the rx continues recording. -- Paul Nicholson --