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From: | Shruti Gupta |
Subject: | Re: Problems with packet communication using BPSK |
Date: | Tue, 11 Aug 2020 16:49:29 +0530 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
Hi!
I know that without any packet structure in '1', the received data is being decoded as "AAAAAA......" or "55555.....". Is that what you meant by inverted bit stream? I am not really clear about what you meant by phase ambiguity?
Thanks
Hi all!
I am working on implementing BPSK communication system with SDR in GNURadio. I tried implementing packet-communication in GNURadio using two systems each acting as TX and RX. Using the examples provided in gr-digital , I tried running TX and RX with LimeSDR Mini, but was unable to get them to work. In order to identify and solve the issues, I moved on to implementing everything in step-wise approach, as in-
In this step-wise approach, I was able to get raw communication model (point 1 in above) work properly. However, I am not able to get packet version (number 2) working. I used the same system settings just the introduction of packet structure at TX and correlation estimation & header-payload demux at RX but still no luck. Is there some issue with the way I am implementing packet formation at TX or the correlation estimator is the problem? You can find my implementation at following link:
- Transmit just alternating 1’s and 0’s using BPSK modulation and receiving it on other end using synchronization and demodulation.
- Introduce packet structure into the previous raw-communication model .
- Then add FEC into the system and finally include CRC and achieve the same packet-communication as provided with gr-digital.
https://drive.google.com/drive/folders/1TIWhNuVmclenhLj4qJK2HT-er6RoCcco?usp=sharing
Any suggestions/pointers in order to resolve the issue will be helpful.
Thanks and Regards
SG
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