Click the name of a field from the Downlink pane that is shown below for a description of the field.
Selections:
Off, On
Default: Off
In addition to the methods described in User Interface Basics, you can also select this discrete setting by clicking the Downlink Operating State tool bar icon ().
Range:
8 –
20
Default:16
The IQ sample width and the CPRI line bit rate are used to define the number of antenna carriers that can be transmitted at one time. The antenna carrier limitations are listed in Downlink Antenna Carrier Limitations.
The number of antenna carriers that you can transmit at the same time in the Downlink mode is based on:
IQ Sample Width in the Downlink pane
Line Bit Rate of your SFP in the CPRI pane
Number of Antenna Carriers Allowed at the Same Time in Download Mode
IQ Sample Width |
CPRI Line Bit Rate | ||
614.4 MB/s |
1228.8 MB/s |
2457.6 MB/s | |
8 |
7 |
15 |
24 |
9 |
6 |
13 |
24 |
10 |
6 |
12 |
24 |
11 |
5 |
10 |
21 |
12 |
5 |
10 |
20 |
13 |
4 |
9 |
18 |
14 |
4 |
8 |
17 |
15 |
4 |
8 |
16 |
16 |
3 |
7 |
15 |
17 |
3 |
7 |
14 |
18 |
3 |
6 |
13 |
19 |
3 |
6 |
12 |
20 |
3 |
6 |
12 |
If the width of the input sample is shorter than the IQ sample width, zeros are appended to the input sample until the number of bits of the input sample equals the number of bits of the IQ sample. This is described in more detail in Alignment.
If the width of the input sample is longer than the IQ sample width, the least significant bits of the input sample are truncated until the number of bits of the input sample equals the number of bits of the IQ sample.
Selections:
Packed, Flexible
Default: Packed
In each case, all antenna carrier output samples that are selected in the Enable column are mapped into the frame as a complete block without overlapping the next sample. Bits in the frame that are not used are assigned a "0" and treated as reserved bits ("r").
Packed maps each sample into the CPRI frame consecutively, leaving no space (unused bits) between the samples. For the carriers that are enabled, the samples are mapped in ascending order by its antenna carrier number.
Flexible maps each sample into the CPRI frame using a user-specified word address and bit address (W Address and B Address) as the starting position of the sample.
Antenna Carrier Samples Packing Option Examples
Selections:
No, Yes
Default: No
The maximum absolute sample value of all waveforms is normalized to be 1. All other sample values are normalized using the equation:
Normalized Value = Sample Value / Maximum Absolute Sample Value
The IQ sample width and the CPRI line bit rate defines the number of antenna carriers that can be transmitting at one time. The antenna carrier limitations are defined in Downlink Antenna Carrier Limitations.
The number of carriers that you can transmit at the same time in the Downlink mode is based on:
IQ Sample Width in the Downlink pane
Line Bit Rate of your SFP in the CPRI pane
Number of Antenna Carriers Allowed at the Same Time in Download Mode
Output Sample Width |
CPRI Line Bit Rate | ||
614.4 MB/s |
1228.8 MB/s |
2457.6 MB/s | |
8 |
7 |
15 |
24 |
9 |
6 |
13 |
24 |
10 |
6 |
12 |
24 |
11 |
5 |
10 |
21 |
12 |
5 |
10 |
20 |
13 |
4 |
9 |
18 |
14 |
4 |
8 |
17 |
15 |
4 |
8 |
16 |
16 |
3 |
7 |
15 |
17 |
3 |
7 |
14 |
18 |
3 |
6 |
13 |
19 |
3 |
6 |
12 |
20 |
3 |
6 |
12 |
If the number of carriers enabled exceeds the number of carriers allowed, an error message is displayed when the downlink operation is started.
The antenna carriers are numbered 0 to 23.
Click an empty checkbox to enable the antenna carrier. Click the checkbox of an enabled antenna carrier to disable it.
The number of carriers supported by the Downlink measurement at one time is limited by the IQ Sample Width value and the CPRI line bit rate and is displayed in Number of Carriers Allowed. The number of carriers that are enabled is listed in Number of Carriers Enabled. If the number of carriers enabled exceeds the number of carriers allowed, an error message is displayed when the downlink operation is started.
This file is transmitted to the RE when the antenna carrier is enabled. Downlink can transmit the following file types:
Encrypted waveform files (with a .wfm file extension) that are created by the Agilent N7600A Signal Studio for 3GPP W-CDMA with HSDPA/HSUPA software
Binary waveform files (with a .bin file extension) that consist of the waveforms made up of 4-byte IQ pairs in two’s complement format.
Double-click the Waveform File cell for the desired antenna carrier to display the AxCN (where N is the antenna carrier number) dialog box. This dialog box allows you associate a waveform file with the antenna carrier.
The AxCN dialog allows you to associate a waveform file with the antenna carrier.
The Waveform File Type allows you to select a WCDMA file created by the N7600A Signal Studio for 3GPP W-CDMA with HSDPA/HSUPA software application or a binary (BIN) file created by another software product that you may be using to create a waveform file.
Enter the waveform file's path and file name in the Waveform File box or use the Browse button to find the file using a browser.
When loading a waveform file for download, there are limitations to the size of waveform that can be used. These limitations are based on the line bit rate.
If the line bit rate = 614.4 MB/s, the size of the waveform is limited to 3333 UMTS frames.
If the line bit rate = 1228.8 MB/s, the size of the waveform is limited to 1666 UMTS frames.
If the line bit rate
= 2457.6 MB/s, the size of the waveform is limited to 833 UMTS frames.
When you assign a waveform file to an antenna carrier, you may not be able to view the entire path or file name. Steps to view the complete path and file name If the path is long and exceeds one line, the display may resemble the illustration below. However, you can adjust the height of the row to show the entire path and file name. In the gray column to the left of the AxC column, Move you cursor to the horizontal line at the bottom of the row. When you move the cursor so that it becomes a double-headed vertical arrow, click the horizontal line and drag in down slightly to increase the height of the row.
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Range: 1 – 15
The starting address is defined by the word address along with the bit address. This column is applied only when the Frame Packing Option is set to Flexible.
Range: Even address numbers within these ranges based on the line bit rate:
614.4 MB/s: 0 – 6 |
1228.8 MB/s: 0 – 14 |
2457.6 MB/s: 0 – 30 |
The starting address is defined by the bit address along with the word address. This address must be an even number within the listed range. This column is applied only when the Frame Packing Option is set to Flexible.
Range: Any
value less than or equal to 0 dB
Default: 0 dB
The entire waveform is attenuated by value specified. This value is entered as a negative value.
Selections:
Trailing Zeros, Leading Zeros
Default: Trailing Zeros
Zeros are appended to the input sample until the width of its bits equals the output sample width.
If Leading Zeros is selected, the zeros are added before the waveform sample information.
If Trailing Zeros is selected, the zeros are added after the waveform sample information.
If the width of the input sample is 16 and the Output Sample Width = 20, four "0's" are appended to the input sample as shown below.