[Discuss-gnuradio] calc_metric in digital_constellation_receiver

2013-02-24 Thread Manu T S
I want to use trellis codes along with generic_mod_demod. 1. Can I replace the constellation_receiver object with a trellis_metric followed by a viterbi? If so is it required to have an operation equivalent to phase correction in constellation_receiver? How can I do that? 2. There is a function f

[Discuss-gnuradio] OP25 error- ioctl(d_tap, TUNSETIFF, &ifr): Operation not permitted

2013-02-24 Thread md123
I know none of you are working on OP25 but has anyone seen this error? i cant find anything on the web about this. I already had to disable the Waterfall sink and the FFT sink in order to get rid of the "AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'" error. Now

[Discuss-gnuradio] Receiving My Own Transmitted Packets after disconnecting from Transmit Path and connecting to Receive Path

2013-02-24 Thread Yahya Ezzeldin
Hi, I wrote a gnuRadio code that allows me to switch between a Tx_Path and Rx_Path every 10 seconds. The code is based on the tb.lock() , tb.unlock() functions and the benchmarks provided with gnuradio. I am able to do the switching fine, however after switching from transmission to reception, t

Re: [Discuss-gnuradio] calc_metric in digital_constellation_receiver

2013-02-24 Thread Ben Reynwar
On Sun, Feb 24, 2013 at 6:36 AM, Manu T S wrote: > I want to use trellis codes along with generic_mod_demod. > > 1. Can I replace the constellation_receiver object with a trellis_metric > followed by a viterbi? If so is it required to have an operation equivalent > to phase correction in constella

Re: [Discuss-gnuradio] What is IF data header?

2013-02-24 Thread Josh Blum
On 02/23/2013 12:56 AM, Gong Zhang wrote: > Hi, >I found the following notes in file metadata.hpp in UHD: >/*! > * RX metadata structure for describing sent IF data. > * Includes time specification, fragmentation flags, burst flags, and > error codes. > * The receive routines

[Discuss-gnuradio] Problem setting USRP transmitting signal power

2013-02-24 Thread warren4300137
Hi~ I found some strange problem setting USRP transmitting signal power. The method I change the transmit power is to use a constant to multiply the signals. the problem is that I use bigger constant like 2.0, the SNR value i calculate is lower than using constant like 1.0. the transmit signal val

[Discuss-gnuradio] AttributeError: 'module' object has no attribute 'square_ff'.

2013-02-24 Thread Omer Omer
hi everyone,i have made  my own block in gnuradio name square_ff from out of tree module.i hsvr successfully interfaced it with gnuradio.but problem is when i want to use that block in gnuradio then the following error i get in terminal. AttributeError: 'module' object has no attribute 'square_f

[Discuss-gnuradio] What are the actual meaning of slot_interval, guard_interval, lead_limit in TDMA engine of Pre-Cog

2013-02-24 Thread Alex Zhang
Hi John, I am using the TDMA engine of the Pre-Cog, and investigating the code. For some parameters in the initlization of the TDMA engine, I am wondering if i understand correctly: self.initial_slot = initial_slot self.slot_interval = slot_interval self.guard_interval = g