[Discuss-gnuradio] OFDM Modification

[CHIN-YA HUANG]

Hi,

I use an array to implement supporting multi-constellation scheme for OFDM 
system, but 
I got a problem in modifying the code for /trunk/ 
gnuradio-core/src/python/gnuradio/blks2impl/ofdm.py

in which I generate a parameter multi_modulation[i][j]
while i is the ith subcarrier, and j is the used modulation scheme.
However, I have no idea how to modify the following  :

                 expert.add_option("","--multi_modulation",type ="array", 
default = "",
                                     help="set the number of use 
multi_constellation decision [defalut=%default]")

where I want to use "bpsk" as default for whole subcarrier, and type array to 
assign which subcarrier should use other constellation scheme. For example [2 
"qpks" ; 5 "16qam"] means the 2nd subcarrier use qpsk, and the 5th subcarrier 
use 16qam.

Another question is, what's the meaning for the parameter arity? I thought I 
also need to change it to an array for different subcarriers, but I also got 
stuck there.