[srslte-users] USRP Antenna TX-Rx Power

[john wu]

Hi Cristian,
what i told the power of my amplifier is not P1DB. it is already the output power of the LTE signal with good linearity. so the P1DB is 100W for the 10W amplifier for 10db PAPR input signal. and if your input signal is 15db i think you can set the ouput power of the 10W amplifier to 5W which you can set the ALC value in the amplifier. then you will get an acceptible 5W output LTE signal for the 15db PAPR input signal.



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Best Regards

________________________________
From: Cristian Balint <cristian.balint at gmail.com>
Sent: Friday, June 4, 2021 16:42
To: john wu <john.wu.8899 at hotmail.com>
Cc: openair5g-user <openair5g-user at lists.eurecom.fr>; srslte-users at lists.softwareradiosystems.com <srslte-users at lists.softwareradiosystems.com>; Charbel Lahoud <charbel.lahoud at etit.tu-chemnitz.de>
Subject: Re: [srslte-users] USRP Antenna TX-Rx Power


Hi John,



Hi Cristian,
it design for PAR 10db. so you can set back the output power to support 15db PAPR, for example use 5W output power with the 10W amplifier. actually the PAPR of OAI is not as high as 15db when it have full traffic.\

* Case of PAR=10dB for 5W (37dBm) target means that you need 50W (47dBm) capability of power (even at 0.01% CDF, still needed).
* Commercial grade RF solutions usually do not exceed 9dB PAR, i.e. NXP's LDMOS series touted for 5W (36dBm) can handle max 20W (42dBm @P1dB) even for a continuous amount of time.

what do you mean the rf path?


* Documentation table advertise absolute max power being at P1dB ?
* Is that a combined rf path with separate handling of peaks (for high PAR) ?
* If a combined rf path does it correct / compensate for phase inequalities at the combiner stage (have a predistorsioner) ?
* Are bias currents controlled actively for drift compensation ?
* How does it handle and tolerate impedance / antenna mismatches ?

A simple diagram can reflect the capability and basic elements composing the path of the amplifier.

LTE is so different from the CW (continuous wave) world, it must be handled accordingly.




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