Hi LRK,
Thanks for the reply! I thought so too, that this capture effect or
phase locking or limiting should come from the demodulator or clock
recovery block, but looking at the c++ files, I couldn't find anything
related to this. Did I miss something?
The receiver is connected as follow
Hi, thanks for the hints!
I was thinking about the clock recovery too. Its pretty complicated in
there, but I keep trying.
I just discovered that the performance of sender and receiver also
depends on the interpacket times of the sender ...
(remember I mentioned before that the sender sen
Hmm,
there is a clock recovery block (gr.clock_recovery_mm_ff) that may lock to the
stronger signal. Maybe you can find a way to stop it from changing things after
you found an SFD, and turn it on again after the packet. I don't know what the
block is doing exactly, but changing its parameter
Hi,
Quote "you can modify the receiver to just continue receiving anyway"
This is already done within the packet_sink by saying
if (min_threshold < d_threshold or true)
hence as soon as the receiver got into the decode_chips loop, it
should stay there! ((c == 0xff) should never hapen!)
cou
Hi,
you should check out ucla_ieee802_15_4_packet_sink.cc, the receiver checks if a
valid chipping sequence for a payload symbol was found (after synch), and
starts searching for a new SFD in case there is no possibly matching symbol.
...
unsigned char c = decode_chips(d_shift_reg);
if(c == 0x
Hi Matthias,
Thanks a lot for your suggestions.
The thing is, one transmitter (jammer) is sending packets nonstop at a
constant transmit power, while the second transmitter (sender) sends a
packet every millisecond or so.
In this scenario, the receiver is always synchronized with the jamme
Hi Bjoern,
the receiver uses FM demodulation to track phase changes, and when two signals
collide the stronger one simply has the larger influence on the overall phase.
This is actually a good property, because you still have the chance to receive
one of the colliding packets.
Do you want to
Hi everyone,
First of all thanks a lot for any support!
I'm use the UCLA zigbee PHY (IEEE 802.15.4) on three nodes, of which
one is a dedicated receiver and the other two nodes are transmitting
simultaneously (No CSMA!).
I noticed that something like a capture effect is taking place,
mea
