Code Order (W-CDMA(3GPP)/HSPA)

Code Order sets the Code Domain Power display code order to Bit Reversed or Hadamard. This will determine how the code domain power trace data is displayed.

Bit Reversed (Default): Related Code Channels are viewed adjacent to each other on the code domain power trace data display,
Hadamard: Reorders related Code Channels so that they are viewed as dispersed along the X-axis as defined by the Hadamard code order on the code domain power trace data display,

Code Order effects how the Code Domain Power data is displayed and does not change the measurement results.

Using Code Order to make W-CDMA(3GPP) Code Domain Power measurements

For W-CDMA Code Division Multiple Access: One of several digital wireless transmission methods in which signals are encoded using a specific pseudo-random sequence, or code, to define a communication channel. A receiver, knowing the code, can use it to decode the received signal in the presence of other signals in the channel. This is one of several "spread spectrum" techniques, which allows multiple users to share the same radio frequency spectrum by assigning each active user an unique code. CDMA offers improved spectral efficiency over analog transmission in that it allows for greater frequency reuse. Other characteristics of CDMA systems reduce dropped calls, increase battery life and offer more secure transmission. See also IS-95.(3GPP) modulation, the Bit Reversed code order shows related channels next to each other on the code domain power display. This is a convenient way to quickly identify related Code Channels.

Another way to look at the same data is by reordering the Code Channels so that related Code Channels are dispersed along the X-axis as defined by the Hadamard code order.

To view related Code Channels grouped together for W-CDMA(3GPP) modulated signals select the Bit-Reversed Code Order (Trace > Digital Demod tab > Code Order text box).

For more information on the rest of the available parameters shown in this dialog box, see Digital Demod Trace Data Property dialog box.