Spread Code Length (W-CDMA(3GPP)/HSPA)

Menu Path: MeasSetup > W-CDMA(3GPP)/HSPA Demod Properties > Channel/Layer tab

Default: 256 (15 ksym/s) (See W-CDMA(3GPP) Standard Setups/Presets Table.)

Range: Downlink: 4 to 512
           Uplink: 2 to 256 (See Chip Rate, Symbol Rate and Code Channel Table.)

Spread Code Length specifies the Despread Channel for analysis. Spread Code Length is also known as the Orthogonal Variable Spreading Factor (OVSF Orthogonal Variable Spreading Factor (codes)). The Spread Code Length is used along with the Code Channel to specify the channel used for the Despread Channel Trace Data.

Setting the Despread Channel Spread Code Length

The drop-down list provides a list of available 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) compliant spread code lengths that can be selected. To set the Spread Code Length, click the text box down arrow, then click the desired Spread Code Length.

Chip Rate, Symbol Rates, and Spread Code Lengths

The chip rate determines the symbol rate for each Spread Code Length. See Chip Rate, Symbol Rate, and Spread Code Table for more information.

See Also

Despread Channel Trace Data

Using a Standard Setup

Channel/Layer tab - W-CDMA(3GPP)/HSPA Demod Properties

W-CDMA(3GPP)/HSPA Demod Properties