[Commit-gnuradio] r4103 - gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python

[n4hy]

Author: n4hy
Date: 2006-12-16 12:17:07 -0700 (Sat, 16 Dec 2006)
New Revision: 4103

Modified:
   gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm_test.py
Log:
Bug fix in SNR calculation

Modified: 
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm_test.py
===================================================================
--- 
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm_test.py    
    2006-12-16 19:08:27 UTC (rev 4102)
+++ 
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm_test.py    
    2006-12-16 19:17:07 UTC (rev 4103)
@@ -56,13 +56,13 @@
         self.show_debug_info = True
         
         # parameters
-        fftsize = 128
-        occupied_tones = 60
-        symbol_length = 160
+        fftsize = 512
+        occupied_tones = 384
+        symbol_length = 512+64
 
         cpsize = symbol_length - fftsize
 
-        SNR_db = 20
+        SNR_db = 10
         SNR = 10.0**(SNR_db/10.0)
 
         power_in_signal = occupied_tones
@@ -82,7 +82,6 @@
         self.ifft = gr.fft_vcc(fftsize, False, win)
         self.cp_adder = gr.ofdm_cyclic_prefixer(fftsize,symbol_length)
         self.noise_adder = gr.add_cc()
-        SNR = math.sqrt(10.0/occupied_tones)
         self.noise = gr.noise_source_c(gr.GR_GAUSSIAN,noise_voltage,1)
 
         #self.debugfile = gr.file_sink(gr.sizeof_gr_complex,"debug_out")