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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_codechan_desc.fm
Code Channel Timing and Phase Measurement Description
Code Channel Time/Phase Measurement Graphical Display
The Code Channel measurement displays up to 16 bins
1
of timing error information and 16 bins of phase error
information. Each bin represents one active code channel.
The IS-2000 system achieves high data rates by combining multiple code channels. To facilitate the display of
high data rate channels in contiguous blocks, the Walsh code sequence along the graph’s x-axis is displayed in
“bit reversed” order. See Table 3. “Walsh Numbering on Code Channel Timing and Phase Graphs”
The code channel sequence along the graph’s x-axis is displayed in “bit reversed” order. See Table 3. “Walsh
Numbering on Code Channel Timing and Phase Graphs”
The timing and phase graphs, because of the bit-reversed order, can display channels with a spreading factor
less than 16, such as the R-SCH (Reverse Supplemental CHannel), using one bin.
For example, Figure 3. shows four active code channels displayed in four bins. In bin four, Walsh code channels
1, 3, 5, 7, 9, 11, 13, and 15 are all included in a single channel. If the Walsh numbering on the test set’s display
were sequential, the this channel would have to be displayed as eight bars, each separated by one Walsh code.
Table 2. Code Channel Time/Phase Error Measurement Results
Code Channel Time/Phase Error
Code Channel Time
Code Channel Phase
1. Bins are the bars that appear on the graph. When high data rate channels such as the F-SCH channel are transmitted from the
mobile station, wider bins are displayed. The wider bins represent code channels that occupy multiple orthogonal channels.
Table 3. Walsh Numbering on Code Channel Timing and Phase Graphs
Bin Number
(with
spreading
factors = 16)
0123456789101112131415
Walsh Code
Channel
0841221061419513311715
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