Nokia Solutions and Networks T5EG1 ユーザーズマニュアル

Apr 2001

E-1

All channel elements transmitted from a BTS in a particular 1.25 MHz
CDMA channel are orthonogonally spread by 1 of 64 possible Walsh
code functions; additionally, they are also spread by a quadrature pair of
PN sequences unique to each sector.

Overall, the mobile uses this to differentiate multiple signals transmitted
from the same BTS (and surrounding BTS) sectors, and to synchronize
to the next strongest sector.

The PN offset per sector is stored on the BBX2s, where the
corresponding I & Q registers reside.

The PN offset values are determined on a per BTS/per sector(antenna)
basis as determined by the appropriate cdf file content. A breakdown of
this information is found in Table E-1.

There are three basic RF chip delays currently in use. It is important to
determine what RF chip delay is valid to be able to test the BTS
functionality.  This can be done by ascertaining  if the CDF file 

FineTxAdj

  value was set to “on” when the MCC was downloaded with

“image data”. The 

FineTxAdj

 value is used to compensate for the

processing delay (approximately 20 

mS) in the BTS using any type of

mobile meeting IS–97 specifications.

Observe the following guidelines:

If the 

FineTxAdj

 value in the cdf file is 101 (65 HEX), the

FineTxAdj has not been set. The I and Q values from the 0 table
MUST be used.

If the 

FineTxAdj

 value in the cdf file is 213 (D5 HEX), FineTxAdj has

been set for the 14 chip table.

If the 

FineTxAdj

 value in the cdf file is 197 (C5 HEX), FineTxAdj

has been set for the 13 chip table.

CDF file I and Q values can be represented in DECIMAL
or HEX. If using HEX, add 0x before the HEX value. If
necessary, convert HEX values in Table E-1 to decimal
before comparing them to cdf file I & Q value assignments.

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