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diff --git a/gr-trellis/src/examples/grc/readme.txt b/gr-trellis/src/examples/grc/readme.txt new file mode 100644 index 000000000..a5261ac0b --- /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. |