Changes
/* Direct Sequence Spread Sprectrum - DSSS CDMA */
* Frequency Hopping - FH CDMA
=== Direct Sequence Spread Sprectrum - DSSS CDMA ===
In this method, the direct sequence(input data) which is spread over a limited bandwidth is multiplied with a code or spreading sequence (a pseudorandom sequence also known as PN sequence) which will spread the input data over the entire bandwidth of the communication channel. The power density is also reduced and is spread over the frequency spectrum and hence is known as spread spectrum method. The modulation part of DSSS is as shown below.
[[Image:cdma13.jpg|thumb|600px|center|CDMA Modulation]]
The modulated signal is transmitted over the channel and all users can receive it but only the user which knows the correct code can decode the message. This is depicted in the figure below.
Anonymous user
