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Diffstat (limited to 'gnuradio-examples/grc/trellis/readme.txt')
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diff --git a/gnuradio-examples/grc/trellis/readme.txt b/gnuradio-examples/grc/trellis/readme.txt new file mode 100644 index 000000000..d620fd628 --- /dev/null +++ b/gnuradio-examples/grc/trellis/readme.txt @@ -0,0 +1,16 @@ +This is an example of using gr-trellis in grc. + +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. + +Enjoy. |