Experimental Analysis of Transmission and Soft Decoding of Optimized 4D Constellations
01 January 2013
Different 4D constellation alternatives to PM-8QM were experimentally investigated exhibiting up to 1-dB improvement at 5e-3 SER. Iterative decoding of LDPC coded 4D constellation POLQAM (6PolSK-QPSK) provided up 4.8-dB gain (at 3.8E-3, 30% OH).
