Summary of Last Lecture•Coding essential for reliable communication. Central ingredient of any digital wireless system. It allows reducing error probability (at rates below capacity) at the expense of complexity and latency.•Studied (n,k)binary linear block codes, which map blocks of kbits into codewords of nbits. Systematic if the first kdigits are the original information bits while the last (n-k)are parity (redundancy) bits.•The Hamming distance between 2 codewords is the number of digits in which they differ. The minimum distance between any two codewords, dmin, is a key parameter.