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[Discuss-gnuradio] Re: OFDM implementation

From: KC Huang
Subject: [Discuss-gnuradio] Re: OFDM implementation
Date: Fri, 22 Jun 2007 16:29:31 -0400
User-agent: KMail/1.9.6

Why I run the benchmark_ofdm and there is a warning like below?

  gr_buffer::allocate_buffer: warning: tried to allocate
   20 items of size 1600. Due to alignment requirements
   64 were allocated.  If this isn't OK, consider padding
   your structure to a power-of-two bytes.
   On this platform, our allocation granularity is 4096 bytes.
   And, the program stops!

   Does anyone knows what do I miss?

> Message: 1
> Date: Wed, 13 Jun 2007 22:40:20 -0700 (PDT)
> From: ismail_itee_uq <address@hidden>
> Subject: Re: [Discuss-gnuradio] OFDM implementation
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=us-ascii
> I've checked out the latest version (5772) and tried running the
> benchmark_ofdm files.  The benchmark_ofdm.py and ofdm_benchmark_tx.py seem
> to be working.  But when I use the benchmark_ofdm_rx.py I get the following
> error:
> python: gr_ofdm_correlator.cc:105: gr_complex
> gr_ofdm_correlator::coarse_freq_comp(int, int): Assertion `symbol_count <=
> 1000' failed.
> Aborted (core dumped)
> Currently I'm using two USRPs on one PC and tried transmitting across the
> air. (I modified the benchmark_rx with 'which=1').  I ran the scripts as
> follows:
> ./benchmark_ofdm_rx.py -f2.45e9 -d100
> ./benchmark_ofdm_tx.py -f2.45e9 -i200 --tx-ampl=200
> I hope you can give me some pointers to solve this.
> -Ismail

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