The specific issue with LDPC and Turbo Codes is that they both introduce latency, and require a ton of compute to decode. If you don't care about latency and h

The specific issue with LDPC and Turbo Codes is that they both introduce latency, and require a ton of compute to decode. If you don't care about latency and have an "unlimited" compute budget, then they're great and hence they were used very early for deep space communications. The speed-of-light delay means that there's minutes or even hours of latency anyway. And of course, the receiving station is a data centre with as much computer power available as you please. In hand-held devices running on battery with latency constraints measured in milliseconds, it's an entirely different ballgame. Suddenly, there's real engineering problems to solve, and the trade-offs aren't always worth it. Something I've told people when both 4G and 5G technologies rolled out is that these are enabled by the advances in the bleeding edge of silicon chip technology. Both rely on very heavyweight signal decoding algorithms that require dedicated "offload" circuitry almost as big as the main CPU! Some anti-5G crazies think that their hand is getting hot from the "radiation", when in fact it is the decoding chip that's getting warm from the power it has to draw from the battery! PS: This is why every new 4G/5G/6G/etc... tech always gets panned as impacting battery life. One or two silicon process shrinks later, this is not a problem. The radio power didn't change, but the decoding power did!