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_shm: shmget (1): Invalid argument
gr::vmcircbuf_sysv_shm: shmget (1): Invalid argument
gr::buffer::allocate_buffer: failed to allocate buffer of size 1536000 KB
gr::vmcircbuf_sysv_shm: shmget (1): Invalid argument
gr::vmcircbuf_sysv_shm: shmget (1): Invalid argument
gr::vmcircbuf_sysv_shm: shmget (1): Invalid argument
gr::buffer::allocate_buffer: failed to allocate buffer of size 1536000 KB
terminate called after throwing an instance of 'std::bad_alloc'
what(): std::bad_alloc
Buffer size is around 1.5GB. i tried to set kernel.shmmax to 8GB but
its not working. I am using Ubuntu 14.04. Kernel and GNU details are:
GNU Radio Companion 3.7.8rc1
GNU C++ version 4.8.4
UHD_003.009.git-217-g012381d9
kernel release - 3.13.0-58-generic
kernel version - #97-Ubuntu SMP
I am new to work with GNU Radio. I am not able to correct this error. If anyone has any idea to correct this please tell me.
Best Regards