Code Domain Measurement Description; How Is The Code Domain Measurement Made; Code Domain Measurement Results - Agilent Technologies 8960 Series Reference Manual

Code Domain Measurement Description

How is the code domain measurement made?

Code domain power (CDP) is an analysis of the distribution of signal power projected on a code-space of a
particular dimension, normalized to the total signal power. To analyze the composite waveform, each channel
is decoded using a code-correlation algorithm. This algorithm determines the correlation coefficient for each
code. Once the channels are decoded, the power in each code channel is determined.
Code domain error (CDE) measurements are made by sampling the down-converted input signal, then
applying DSP (Digital Signal Processing) techniques to determine the original data input to the UE
transmitter's OVSF code spreading function for each channel. The DSP uses the original data and coding to
generate a representation of the original waveform. This is the reference waveform for the code domain error
measurements.
CDE is determined by comparing the reference waveform with the waveform being measured to determine the
error vector. The error vector is projected onto the code domain at the same spreading factor used to determine
CDP. The error vector for each power code is defined as the ratio to the mean power of the reference waveform
expressed in dB.

Code domain measurement results

• Graph of Code Domain Power and Code Domain Error results.
— The x axis always has a resolution of 256 codes (SF=256).
— The CDP and CDE are computed in the correct spreading factor for the DPCCH and DPDCH as defined
for the channel type used. For example, in the graph below the 64k RMC is used. Therefore, the
DPDCHoccupies C as defined in the 3GPP standards. (C
ch,16,4 ch,Spreading Factor,Code Number
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Code Domain Measurement Description
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