CDMA often also called “spread spectrum”
,Developed, to transfer digital signals over poor radio channels in a reliable manner
,Each bit to be transmitted is coded with a longer code (chip) sequence
,Spreading factor: Number of chips per data symbol (bit)
,Chip rate: Number of chips transferred per time unit
,Transmitter and receiver use the same code sequence
,Different orthogonal code sequences used simultaneously allow several bit streams to be tra