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Re: [Discuss-gnuradio] BPSK problem: intermittent inter-symbol interfere

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] BPSK problem: intermittent inter-symbol interference and phase change
Date: Thu, 31 Aug 2017 12:40:53 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1


sorry, that TX flowgraph is a total untidy mess. I counted the <block> tags, and there were 90, and most of them were disabled, but cluttering the canvas. I didn't even bother to open the RX.

If you want people to assess your flowgraphs, you'll have to reduce them to only contain what is relevant to the problem, and tidy them up to be as clear as possible. Everything less would be a waste of your own time! Reducing a problem to the minimum is actually a *necessary* step in solving it.

Best regards,

On 08/29/2017 05:27 AM, Edwin Li wrote:

I implemented a simple BPSK system. I ran simulation in GNURadio with no channel effect added. Some of the received packets look weird. The first attachment shows three received packet. They are supposed to be identical. However, the second one suffers from ISI and a phase change.

I also attached my grc files. Could someone take a look at it and help me figure out the cause please? Thank you very much!


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