Download Software Manual WinIQSIM

WinIQSIM
TD-SCDMA
13.2.2
TD-SCDMA Configuration Panel
All parameters necessary for the definition of a TD-SCDMA signal (except for data sources and
impairments) can be accessed via the TD-SCDMA Configuration panel.
Fig. 13-9
TD-SCDMA Configuration panel
13.2.2.1
General Settings
The following parameters are defined in the General Settings panel:
• Mode
Here it is defined whether only the base station (downlink only) or only the mobile stations (uplink
only) or both types of station (downlink and uplink) should be active in a cell.
• Chip Rate Variation
This parameter allows changing the output chip rate (i.e. the rate of spread symbols used for signal
output by AMIQ, for example) as against the standard chip rate of 1.28 Mcps. The standard chip rate
of 1.28 Mcps can be restored any time by means of the Set to standard button.
• Sequence Length
The length of the signal to be generated can be set in 5 ms frames.
The number of chips per frame is 6400.
• Different start values for PRBS
If this button is active, the PRBS generators of the individual channels are initialised with different
start values. As a result, all channels are calculated with independent source data.
Note:
This button is effective only for the data source designated "Data Source PRBS".
If, for example, "Data Source 0" with PRBS16 is used, the button is ignored, i.e. all
channels using Data Source 0 are calculated with identical PRBS bit sequences.
• Clipping Level
A clipping value can be set as a percentage of the highest peak. The range is 1 to 100 %.
A value of 100 % means that the signal is not clipped. Clipping reduces the crest factor.
Clipping can be effected based on two different parameters:
vector | i+jq | :
The instantaneous amplitudes | i+jq | are used as peak value.
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