CDMA Architecture in Wireless Communication
CDMA stands for Code Division Multiple Access. It combines the features of both TDMA and FDMA, a station can send the frame at any frequency. CDMA is now widely used in mobile communications.
In CDMA, each bit is subdivided into some intervals that are known as Chip. Typically there are 64 or 128 chips in a bit. Each station is assigned a unique m-bit code that is called Chip Sequence.
To transmit a ‘1’ bit, it sends its chip sequence and to transmit a ‘0’ bit, it sends the 1’s complement of its chip sequence. No other chip sequence is allowed to be transmitted.