You can choose component library from component pallet
list (bthlib) on the top left of the schematic window.
Here is a list of the components used in this example:
1- Binary random bits output (common components library)
This component generates output binary bits with bit probability
defined by probability of zero and this can be in the range of 0 to 1.
By double clicking on the component in the schematic you get a window
where you can change the parameters of this component, which is here bit
2- Logic to NRZ block (signal converters library)
This component converts the logic level to NRZ level.
In this example logic '1' is encoded into -1 and logic '0' is encoded into 1.
3- Bit-By-Bit convolutional encoder (CDMA channel codes library)
The encoder type in this example is (1/2 K 3 g0 05 g1 07).
The rate is 1/2
The constraint length is 3
g0 (05=101) gives the polynomial of the first modulo 2 adder
g1 (07=111) gives the polynomial of the second modulo 2 adder.
4- Delay component (Numeric, control library)
This component delays the input from output by N samples.
5- AWGN channel (CDMA test library)
Additive white Gaussian noise channel, in this component the noise of
the channel can be controlled by changing the parameter EbN0 Ratio.
6- Bit-By-Bit Viterbi decoder for convolutional encoder (CDMA channel codes library)
The decoder uses the same parameters as the encoder (1/2 K 3 g0 05 g1 07).
For more information about Viterbi decoder check to the following link: http://pweb.netcom.com/~chip.f/Viterbi.html
7- TKPlot (interactive control and display library)
Displays the input versus sample number.
8- DF, DataFlow (controllers library)
This controller is required for signal processing simulation.