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I was always surprised why QAM uses a rectangular I/Q coordinate rather than a radial one like how 8PSK does it. It would seem like a radial pattern maintains b
by hatsunearu 3y ago
I was always surprised why QAM uses a rectangular I/Q coordinate rather than a radial one like how 8PSK does it. It would seem like a radial pattern maintains better ISI margin just from inspection.
- drmpeg 3y agoWith less error coding (13/15 code rate), the constellation is more rectangular. https://www.w6rz.net/64qamnuc1315.png https://www.w6rz.net/64qamnuc1315.png With really heavy error coding (2/15 code rate), the constellation becomes almost unrecognizable with points very close to each other. https://www.w6rz.net/64qamnuc215.png https://www.w6rz.net/64qamnuc215.png
- abnry 3y agoWow. There must be some interesting coupling between the coding and the constellation/modulation.