Contents
Can a DSSS decode a CDMA signal?
Although using DSSS it is not possible to decode a signal unless the correct spreading code is used in the receiver, using CDMA, it is also necessary to ensure that the minimum level of mutual interference is caused between different users accessing a base station.
How to demodulate DS signals using multiple codes?
In order to demodulate DS signals, you need to know the code that was used at the time of transmission. In this example, by multiplying the code used in the transmission to the reception signal, we can get the transmitted signal. In this example, multiple codes were used at the time of transmission (10,110,100) to the received signal.
Why are the CDMA spreading codes orthogonal to each other?
Being orthogonal, the different CDMA signals are able to operative with little mutual interference. The CDMA spreading codes are used to increase the bandwidth of the signal to gain the benefits of spread spectrum communications, but reducing the mutual interference requires the codes are orthogonal.
How to decode a DSSS code in bipolar?
Multiply the information in bipolar by the DSSS code in bipolar. Integrate and Dump for a period of the bit (2 chips -or samples-). Then decode the original bit according to the sign of the integral results. (go to unipolar, so negative value translate to 0) Comments suggest to first de-speard (dsss code) then BPSK.
What kind of code is a gold code?
A Gold code, also known as Gold sequence, is a type of binary sequence, used in telecommunication (CDMA) and satellite navigation (GPS).
Why are Gold codes used in satellite navigation?
A Gold code, also known as Gold sequence, is a type of binary sequence, used in telecommunication ( CDMA) and satellite navigation ( GPS ). Gold codes are named after Robert Gold. Gold codes have bounded small cross-correlations within a set, which is useful when multiple devices are broadcasting in the same frequency range.
CDMA codes and correlation. The concept of CDMA is based around the fact that a data sequence is multiplied by a spreading code or sequence which increases the bandwidth of the signal. Then within the receiver the same spreading code or sequence is used to extract the required data.