Axesstel PST - Manual (Page 113)

AXESSTEL Software User's Guide Contents
searcher will dwell coherently at each chip during a sweep of a
search window. The choices are phone default (0), 360 (1), 512 (2),
720 (3)
, and 1020 (4).
Using small numbers of integration chips yields faster search scans
at the expense of a higher apparent noise floor. Using more chips
yields a lower noise floor at the cost of speed. The default value (the
value normal AXESSTEL phones utilize) is 512 chips. At this
level, the apparent noise floor is approximately -20 dB E c /I o .
The following equation estimates the scanner noise floor given
parameter integ:
Noise Floor E c /I o = 18 - 10 * log10( 13 * integ )
SCAN_CONFIG
Parameters
Using this equation, the approximate noise floor for the different
settings is as follows:
The column Average Search Speed was obtained by benchmarking the
average time it takes to complete a scan of the entire PN space (all
32,768 chips), assuming that incr=4 and win_siz=256.
Speed benchmarks for other incr/win_siz combinations will
approximately track these numbers except when incr is very small
(for example, incr=1). For small incr values, the all-PN-space search
speed will be slower than these values, due to Pilot Scanner software
processing overhead latencies with very frequent searching.
HO_TYP
The ho_typ parameter determines how the Retriever Pilot Scanner
maintains the channel while scanning PNs.
By default, the Retriever Pilot Scanner uses ho_typ=0 to maintain the
channel like a normal operational phone. That is, according to
IS-95-A/J-STD-008, the phone tracks the Active pilot (serving
system), monitors the Neighbor PNs as listed in the Extended
Neighbor List Message, and performs an Idle Handoff if the
Neighbor is sufficiently stronger than the Active to warrant handoff.
Integ Noise Floor (dB) Average Search Speed (Sec)
360 -18.5 1.5
512 -20 2.0
AXESSTEL Proprietary
113