Generate a mapping table for the QAM constellation shown in Figure 6.3 using I and Q...

 

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Generate a mapping table for the QAM constellation shown in Figure 6.3 using I and Q channel voltages of tV and ±3V. I 0001 0101 0010 0000 0100 0110 #0 0010 0110 0111 0011 0111 0011 1101 1001 1100 1000 1110 0110 1111 1011 1010 1110 1111 1011 1000 1100 16-APSK 0000 1101 0101 1001 0100 0001 16-QAM Figure 6.3 Constellation diagrams for 16-QAM and 16-APSK. The Gray coding applied in each case is not unique; other Gray coded sequences can be used, and the assignment of symbols to phase states is also arbitrary. 16-APSK is the preferred choice when the transmitted signal must pass through a non-linear transponder, but 16-QAM has the advantage that a lower CNR is required for a given bit error rate than with 16-APSK. Generate a mapping table for the QAM constellation shown in Figure 6.3 using I and Q channel voltages of tV and ±3V. I 0001 0101 0010 0000 0100 0110 #0 0010 0110 0111 0011 0111 0011 1101 1001 1100 1000 1110 0110 1111 1011 1010 1110 1111 1011 1000 1100 16-APSK 0000 1101 0101 1001 0100 0001 16-QAM Figure 6.3 Constellation diagrams for 16-QAM and 16-APSK. The Gray coding applied in each case is not unique; other Gray coded sequences can be used, and the assignment of symbols to phase states is also arbitrary. 16-APSK is the preferred choice when the transmitted signal must pass through a non-linear transponder, but 16-QAM has the advantage that a lower CNR is required for a given bit error rate than with 16-APSK.

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