Turbo, LDPC and polar codes approach Shannon limit.
Turbo codes (iterative decoding of two convolutional codes) and LDPC codes (sparse parity-check graphs with belief propagation) approach Shannon limit within 0.5 dB; polar codes (channel polarisation) are provably capacity-achieving and used in 5G control channels. Used in 4G/5G, Wi-Fi, DVB and deep space.
Wi-Fi 6 and 5G data channels use LDPC codes.
Modern codes approach the Shannon limit closely, so they are used in 5G, Wi-Fi and deep-space links where every decibel counts.
Turbo, LDPC and polar codes approach Shannon limit.
Modern codes approach the Shannon limit closely, so they are used in 5G, Wi-Fi and deep-space links where every decibel counts.
Low-density parity-check codes with sparse parity matrices, decoded iteratively, which perform very close to the Shannon limit.
They achieve capacity by polarising the channel, and they are used in 5G for control channels.
Typical applications include choosing LDPC codes for a 5G data channel, using polar codes for control information in 5G and designing a turbo-coded link for a deep-space probe.
Study "Block and convolutional codes" first (topic 85 of 101 in Signals, Control & Comms). It covers the groundwork this topic builds on.
Iterative decoding. EXIT charts. 5G NR LDPC for data.
Wi-Fi 6 and 5G data channels use LDPC codes.
The next topic is "Multiplexing", which builds directly on this one.
It is classed as Advanced in Signals, Control & Comms (topic 86 of 101). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Signals, Control & Comms.
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