On Fri, Jan 8, 2016 at 12:44 PM, Hitesh Kasera
> wrote:
>
>> thanks tom for your reply. as you told me to use fec api blocks i tried
>> to use fec encoder and decoder blocks but still my output is not same as
>> input. may be i am missing something while i am using these
at 8:30 PM, Tom Rondeau wrote:
> On Fri, Jan 1, 2016 at 3:17 AM, Hitesh Kasera
> wrote:
>
>> Hi everyone,
>>
>> I am trying to use ccsds 27 encoder-decoder to transmit some data. The
>> decoded data is not same as transmitted. As a source i am transmitting one
Hi everyone,
I am trying to use ccsds 27 encoder-decoder to transmit some data. The
decoded data is not same as transmitted. As a source i am transmitting ones
and zeros but after decoding sometimes i am receiving values which are
greater than 1. i am not able to recognize where am i going wrong.
sed 500kbits/second. By
setting these data rates i am getting same SNR for Both but not same BER.
Do i need to change any other parameter for qpsk? if any one has any idea
about it please tell me.
Best Regards,
Hitesh
On Tue, Oct 13, 2015 at 12:13 AM, Hitesh Kasera
wrote:
> Hi everyone,
Hi everyone,
I am trying to calculate BER for bpsk and qpsk using digital_bert_tx.py and
digital_bert_rx.py. i want to compare BER of qpsk and bpsk. At same SNR
around 20db i am getting constant .16 BER for qpsk and for bpsk it is
1e-12. when i change the SNR using gain of Transmitter and Receiving
>
> An FFT size of 2048 is still pretty small. In the DVB-T2 OFDM transmitter,
> even with a 16384 FFT size, it's only using 52 MBytes of shared memory.
>
> Ron
>
>
> On 10/06/2015 12:30 AM, Hitesh Kasera wrote:
>
> At first i tried that one only but that didn&#x
>
> sudo sysctl kernel.shmmax=2147483648
>
> for 2 Gbytes.
>
> Ron
>
>
> On 10/05/2015 10:01 PM, Hitesh Kasera wrote:
>
>> Hello everyone,
>> I am trying to implement OFDM TX in GRC but with fft length 2048.
>> according to fft length i have updated syn wo
Hello everyone,
I am trying to implement OFDM TX in GRC but with fft length 2048. according
to fft length i have updated syn words, pilot carriers, pilot symbols,
occupied carriers. When i run the flow graph i get this error:
gr::vmcircbuf_sysv_shm: shmget (1): Invalid argument
gr::vmcircbuf_sysv_
