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Diffstat (limited to 'gnuradio-examples/grc/trellis/readme.txt')
| -rw-r--r-- | gnuradio-examples/grc/trellis/readme.txt | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gnuradio-examples/grc/trellis/readme.txt b/gnuradio-examples/grc/trellis/readme.txt index d620fd628..9c7363af8 100644 --- a/gnuradio-examples/grc/trellis/readme.txt +++ b/gnuradio-examples/grc/trellis/readme.txt @@ -1,5 +1,7 @@ -This is an example of using gr-trellis in grc. +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 @@ -13,4 +15,18 @@ The combined signal is observed in noise and four different receivers are consid 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. |