Digital Data Technologies

slow fading

impacts several consecutive bits, impacts slow and there for long

fast fading

impacts fewer bits, last less than slow fading, over fast

error correction/ error detection

adding additional bits/symbols whose values depend on each other. errors detected if an incorrect code word

minimum hamming distance

how many bits differ from each other is the minimum hamming distance, 0110 and 1111 have a hamming distance of 2

even/odd parity

adding on an additional bit, and if it starts as even and transmits to odd then we know there is an error. the draw back is that you cant detect 2N errors

Cynic Code

length of divisor (divisor -1) # of zeros and if you get 0 reminder then it was arrived with no errors, the minimum errors is 2^(n)

point to point

one host to multiple stations

multipoint

one medium between all stations

full duplex

←——>

half duplex

←—- ——>

simplex

—>