About Trace Data (W-CDMA(3GPP)/HSPA)
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)/HSPA provides trace data in the Time Domain, Frequency Domain and Code Domain. To accommodate all the available measurement results and display formats; the measurement results are grouped into trace data submenu categories. These submenu categories are grouped together by common measurement result types including Channel (x) "Pre-Demod signal results", CDP "Code Domain Power results", Antenna Comp "Composite signal results" trace data, and Despread "Despread channel results."
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Channel (x) is the pre-demodulated time and frequency (spectrum) data results for the identified VSA input channel (where x = the VSA input channel number).
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CDP (Code Domain Power) trace data provides measurement results for specific Code Layers and the Composite signal. CDP Layer trace data results are derived from all Code Channels within one specified code layer (Spread Code Length/Symbol Rate). CDP Composite trace data results are derived from the composite signal, which includes data from all Code Channels and code layers.
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Antenna Comp (Composite) trace data are measurement results derived from the total or composite signal for the specified antenna port (where x = antenna port number). This includes the combined data from all Code Layers (Spread Code Lengths/Symbol Rates) and Code Channels. The data in these traces comes from the demodulator after the MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. decoder.
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Despread channel trace data are measurement results derived from a single Code Channel (Code Channel) within the measured code layer (Spread Code Length (Symbol Rate)).
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Cross Channel 2x1
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Cross Channel measurement results for channel 2 referenced to channel 1. |
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MIMO
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MIMO trace data provides various MIMO Channel Matrix metric's for the Tx(x)/Rx(x) transmission channels. MIMO Trace data results is only available for MIMO measurements with 2 (or more) Tx Antennas selected and configured for 2 Input Channels. For more information about MIMO Trace Data see HSPA+MIMO Measurement Analysis
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Trace data results derived from a math function |
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Trace data results derived from Data Register data |
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No Data |
Active trace as empty. |
Available Trace Data
| Channel (x) Trace Data | Despread (x) Trace Data | Antenna (x) CDP Trace Data | Antenna (x) Comp Trace Data |
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| Cross Channel 2x1 Trace Data | MIMO Trace Data | ||
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| MIMO Info Summary Table |
HSPA+MIMO Trace Date
Refer to HSPA+ MIMO Overview for more information about HSPA+MIMO Measurement Trace Data.
See Also
