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| author | Tom Rondeau | 2012-04-03 11:35:35 -0400 |
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| committer | Tom Rondeau | 2012-04-03 12:26:34 -0400 |
| commit | 7dc08ba2875c0dace0432cd514add6ce2b085f44 (patch) | |
| tree | e6a01fd07cd6c24040886a805105e6323a969834 /gr-trellis/src/examples/grc/readme.txt | |
| parent | 0dd3e32b5526c085a983d7ff235bac61ec2c52ff (diff) | |
| download | gnuradio-7dc08ba2875c0dace0432cd514add6ce2b085f44.tar.gz gnuradio-7dc08ba2875c0dace0432cd514add6ce2b085f44.tar.bz2 gnuradio-7dc08ba2875c0dace0432cd514add6ce2b085f44.zip | |
examples: Reworked locations and installation of examples.
All python and GRC examples directly associated with a top-level component are now in that examples directory. Examples are split into c++, python, and grc dirs but are all installed into $prefix/share/gnuradio/examples/<component>.
Diffstat (limited to 'gr-trellis/src/examples/grc/readme.txt')
| -rw-r--r-- | gr-trellis/src/examples/grc/readme.txt | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/gr-trellis/src/examples/grc/readme.txt b/gr-trellis/src/examples/grc/readme.txt new file mode 100644 index 000000000..9c7363af8 --- /dev/null +++ b/gr-trellis/src/examples/grc/readme.txt @@ -0,0 +1,32 @@ +These are examples of using gr-trellis in grc. + +INTERFERENCE CANCELLATION +------------------------- +Two users are transmitting simultaneously using convolutionally encoded QPSK, each with power P1=alpha*P and P2=(1-alpha)*P. +The combined signal is observed in noise and four different receivers are considered: +1) A viterbi decoder decoding user 1 assuming user 2 is noise +2) A viterbi decoder decoding user 2 assuming user 1 is noise +3) A viterbi decoder decoding user 1 first + and then reencoding this signal, subtracting it from the observation + and then running a Viterbi decoder decoding user 2 +4) A viterbi decoder decoding user 2 first + and then reencoding this signal, subtracting it from the observation + and then running a Viterbi decoder decoding user 1 + +You can change the signal to noise ratio P/sigma^2 and the allocation of power to the two users, alpha. + + +Serially Concatenated Convolutional Codes +----------------------------------------- +An SCCC can be defined by an outer and an inner FSM together with an interleaver +and a modulation type. You can change the SNR and observe the estimated BER. +In sccc.grc the decoding and metric calculation are combined; in sccc1.grc they are separate. + +Parallel Concatenated Convolutional Codes +----------------------------------------- +A PCCC can be defined by two FSMs together with an interleaver +and a modulation type. You can change the SNR and observe the estimated BER. +In pccc1.grc the decoding and metric calculation are separate. + + +Enjoy. |