Attachment B. Methodical manual for the course work

Topic of the course work «Optimisation methods of error-control coding for transmission system»

Introduction. In Chapter 12 it is shown, that error-control coding is effective means for the optimisation of transmission systems. In practice engineer-designer should solve optimisation problems on the basis of numerical calculations and corresponding comparison of a coding methods and a choice of concrete coding methods and corresponding to them the codes. The solution of such problem was underlay in basis of the course work.

Input data are set in the table of variants (table B.2):

1. The digital binary signal with rate R is subject to transfer.

2. The transmission channel is the channel with constant parameters and additive white noise.

3. Signal to noise ratio on a demodulator input is .

4. Methods of modulation are BPSK or QPSK.

5. Mode of reception is coherent.

6. Pass band of transmission channel is F _ch.

7. Probability of an error on an output of transmission system no more p _acc.

8. Permissible complexity of a code trellis – no more C _perm.

It is necessary:

1. To choose and justify a choice of a error-control code for projected system, ensuring demanded bit error probability level p _acc under condition of a following restrictions:

1.1. The bandwidth of the modulated signal D F _s should not exceeds of a Pass band of transmission channel F _ch (D F _s < F _ch).

1.2. By using of convolution codes the code trellis complexity should be no more magnitude C _perm.

2. To develop and give detailed exposition structural and function schemes of the encoder and the decoder for the chosen code and to justify their parameters.

3. To analyze of energy and frequency efficiency of a projected transmission system and to compare them to limiting values of efficiency.

4. To make a conclusion on the done work.