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From: | yeran |
Subject: | Re: [Discuss-gnuradio] how to raise the packet error rate in benchmark |
Date: | Thu, 25 Jul 2013 16:10:37 +0000 |
Hi Adeel,
Thanks for your prompt reply! I don't quite understand your last email. If I want to test the performance of transmission under different power allocation. What should I do? Can you please be more specific about this? Currently, what I'm doing is keep the tx-amplitude 0.2, and change the gain from 35 to 65. You mean in this range, the power is not liner to gain change, right? If so, is there any way to control or influence the power change? Thank you! Regards, Ada Date: Wed, 24 Jul 2013 06:12:15 +0500 Subject: Re: [Discuss-gnuradio] how to raise the packet error rate in benchmark From: address@hidden To: address@hidden; address@hidden Ada, Better performance is not due to smaller power but it is due to the non-linear effects of RF-amplifiers. As per my observations, Tx-Dsp amplitude beyond 0.15 to 0.2 causes the USRP daughter-boards Tx-amplification-stage to go into non-linear region thus error-rate of PSK/QAM increases. Non-linear modulation e.g. FSK/GMSK are more robust to Amps non-linear effects. so u can experiment increasing TX-amplitude both for FSK-variants & PSK/QAM and observe performance.>>once the signal has been up converted. Now I'm using 0.2 amplitude and 35 gain. But I don't understand, how come that the smaller the power is, the better transmission performance there will be. And also, why does power should be in the range of 0 to 1.0? How to calculate transmission power using the -tx-amplitude and tx-gain? On Tue, Jul 23, 2013 at 9:25 PM, yeran <address@hidden> wrote:
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