From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Tsutsumi Family" Subject: RE: 300bps Packet (and EHAS) - what is pam, psk, and newpsk, Date: Sat, 27 Nov 2010 12:58:03 +0900 Message-ID: References: <12668780.9773261290774237884.JavaMail.tomi.manninen@saunalahti.fi> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <12668780.9773261290774237884.JavaMail.tomi.manninen@saunalahti.fi> Sender: linux-hams-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: oh2bns@sral.fi, linux-hams@vger.kernel.org Tomi, I am glad and honored to have the conversation with the author of NEWQPSK codes of the soundmodem. I have the impression after reading the article that they will fit the demands of low speed multi-media data stream transmission with the equivalent performance of SSB voice (See Fig. 16 & 17) and can extend their throughput by multi-bits modulation scheme for rural/naval terrestrial and satellite radio amateur segments. Naturally, I believe there is not strong benefits for the short packet application such as APRS and chats. I had thought that the radio amateurs and EHAS program would be closely coupled for the development but your story tells me that they just borrowed your achievements for their own project. Now, am I correct we, Linux radio amateurs, have the privilege, especially by your efforts, to try their codes and improve for us? Any comments? Regards, take de JA5AEA -----Original Message----- From: linux-hams-owner@vger.kernel.org [mailto:linux-hams-owner@vger.kernel.org] On Behalf Of Tomi Manninen Sent: Friday, November 26, 2010 9:24 PM To: linux-hams@vger.kernel.org Subject: RE: 300bps Packet (and EHAS) - what is pam, psk, and newpsk, Tsutsumi Family [oakie@kamakuranet.ne.jp] kirjoitti: > Are you the Tomi Manninen who implemented the NEWQPSK protocol to the > soundmodem? Yes. > If so, I wish to hear technical comments on the efforts of EHAS program to > improve the codes developed by the Tomi described in the following article > titled "Low cost E-mail over HF with OFDM and turbo coding techniques". > > http://download.ehas.org/misc/articulo_HF.pdf Yes, back when Arnau was developing this, we did some co-operation. At the time Arnau contacted me, I had already done some experiments in improving the framing and FEC. Arnau did a great job implementing Turbo, soft decision sampling etc. Unfortunately I never had time nor anyone to test it with on ham bands (Arnau is not a ham and the general interest on newqpsk and packet had already declined here). But I think the code is available on a SVN server at EHAS. /Tomi, oh2bns -- To unsubscribe from this list: send the line "unsubscribe linux-hams" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html