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Cancel Forgot your password? Showing all editions for 'Information theory, coding and cryptography'. Year 2 3 2 2 2 Language English 7 Chinese 4. Displaying Editions 1 - 10 out of Xin xi lun, bian ma yu mi ma xue. Print book. Information theory, coding and cryptography by Ranjan Bose. The G D is given below. P2 P1 P0 Thus, this encoder takes in one quaternary symbol 2 bits and converts it to 2 quaternary symbols 4 bits. The memory unit of this encoder consists of 3 delay elements.
In reality, such an encoder will be implemented using a 8-bit shift register, with two bit-shifts at a time. The logic circuit will be implemented using GF 4 arithmetic. It is advisable to write a small computer program to calculate the dmin for this code. Thus, this encoder takes in one ternary symbol 2 bits and converts it to 2 ternary symbols 4 bits. The memory unit of this encoder consists of 4 delay elements. Write a small computer program to calculate the dmin for this code.
Construct it using the table above. The trellis diagram has parallel paths. Parallel paths cannot be ruled out right in the beginning. The number of branches emanating from each node will depend on the constellation size of the modulation scheme. The metric of the above form is chosen because it behaves like a distance measure between the received signal and the signal associated with the corresponding branch in the trellis.
It has an additive property, namely, that the total metric for a sequence of symbols is the sum of the metric for each channel input and output pair. However, to obtain such a large value of d p2 L , we need to construct trellis with a larger number of states.