Composite Peak CDE (W-CDMA(3GPP)/HSPA)

Composite Peak CDE is the largest measured Code Channel Code Domain Error.

Downlink Direction: This is the largest measured CDE for all Code Channels (active and inactive) in code layer S256 (15.0 ksym/sec symbol rate) in the composite signal.

Uplink Direction: This is the largest measured CDE for all Code Channels (active and inactive) in code layer S4 (960.0 ksym/sec symbol rate) in the composite signal.

Code Channel is the 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. Code Channel and code layer is the Spread Code Length (or symbol rate).